XL Meter™ Pro
Contents
1. Inc 1997 2002 All rights reserved 2 Information contained in this publication regarding the device applications and the like is intended through suggestion only and may be superseded by updates XLMPUSREN73 page 4 Inventure Automotive Electronics R amp D Inc XL Meter Pro e Set of AA type batteries 4 pieces e CDwith XL Vision software 3 1 Optional complementary The XL Meter universal acceleration end deceleration set contains everything that necessary form normal usage With the help of the optional complementary which are not included the usage of the instrument can be even more comfortable The list of the optional complementary can be read on the homepage of Inventure Automotive Among them are the followings e Brake pedal switch for brake delay examination e USB cable for perfect USB connection e Cigar lighter adapter for continuous readiness in cars 4 Description 4 1 Definition of XL Meter XL Meter M is a battery operated universal acceleration deceleration meter with an alphanumeric LCD display built in service brake performance or acceleration evaluation program and RS 232 compatible PC interface 42 Outlook From technical viewpoint the design of XL Meter is composed of three parts These are the housing containing the electronic control unit the vacuum cup and the jointed arm for flexible suspension 4 2 1 Box XL Meter has an aluminium box specially designe2. OK Auto Power Off No Yes No Yes Buzzer No Yes No Yes Y Y Trigger Output Next OK OK Next i Toggle Next OK Next Next OK Y Start Stop Next OK Next Next OK Next Y No Trigger Out Next OK OK Fa Y Y SN Next End End Next FW Next End End Next Reset Defaults Murs Next OK OK S Calibration Mode Figure 5 Structure of Settings Mode Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 25 XL Pro 4 3 7 View Current Settings Mode This mode is an easy way to get information about the current settings of XL Meter Pro Gamma 4 3 7 1 Entering View Current Settings Mode Right after power on when the on off button Black is not released While the button 1 pushed the display cycle goes round and round and the settings data are listed 4 3 7 2 Display Cycle The display cycle in View Current Settings Mode lists the following data e Language e Measuring Frequency e Measurement Axis e Measurement Range in X direction e Measurement Range in Y direction e X direction e Y direction e Evaluation e Buzzer e Trigger Output e Serial Number e Firmware Version Number 4 3 8 Brake Trigger Input 4 3 8 1 Brake Pedal Switch Design The Brake Pedal Switch not supplied was designed to be easy to install and easy to handle When installed correctly it does not influence the braking movement and applicable pedal force 4 3
3. avoid this damage 4 3 4 3 Data acquisition The XL Meter Pro Gamma is designed to measure the acceleration in two axis longitudinal an lateral Measuring Mode data acquisition can only be started from Display Mode by pressing the red button Since you have started data acquisition the acceleration data are stored in the memory No matter how long you drive in Measuring Mode before braking in each case the last 40 80 seconds of measured data are available in the memory You cannot switch off the XL Meter during data acquisition The display button is the only button that has effect on the measurement cycle pressing it will stop data acquisition The measuring time depends on the Measurement number and the Measuring frequency O Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 11 XL Meter Pro Note Data acquisition and on the spot evaluation are independent separate functions of the instrument It means that due to the data acquisition theory the data are always stored into the memory and can always be uploaded to a PC regardless of the result of the built in service brake performance evaluation program 4 3 4 4 Measuring Directions In XL Meter Pro Gamma the X Y measuring directions are interchangeable and each of them can be negated You can reach these features in Settings menu In some cases e g broken windscreen it can be useful to install the equipment in some other places than the
4. MESSAGES 2 ui 36 42 OPERATION MESSAGES aii 36 7 2 amina ape Op ede uu ua tuya ay ua as 36 13 ERROR MESSAGES cee aaa aha n t ur AMT LIU AR REI QG e 36 ERROR CODES m aynata EA ba kama uba eiie d m ae as ES 37 7 5 PLAUSIBILITY ERROR GODES2 y iD e bte eb eere eet w uy ud 37 8 U Uu u ns aa AN RR 38 8 1 TEST THE TECHNICAL UNIVERSITY OF BUDAPEST anna 38 8 2 TEST BY AN OMH ACCREDITED 38 8 3 G m m 39 9 HOW TO CONTACT 2 21 R4 RAS u 41 10 APPEND CERE 42 an s r xs T r a Inventure Automotive Electronics R amp D Inc XLMPUSRENY3 page 3 XL Pro 1 Introduction Thank you for purchasing an Inventure product Your new XL MeterTM Pro is a carefully engineered high quality durable product with modern features and elegant styling It is designed to give you the quality and convenience you expect from an acceleration deceleration meter To familiarize yourself with all the features of your instrument please read the following instructions carefully Retain this guide for future reference Important All the information written
5. PLED display has switchable brightness Due to the production technology the PLED display has outstanding brightness and contrast Its brightness can be disturbing especially in darkness so its brightness can be increased and decreased by pushing the On Off button for a short time See details in chapter 4 2 4 1 4 2 6 Buzzer The XL Meter Pro Gamma has an integrated Buzzer With the Buzzer s signal it is easier to realise the different states of the instrument The Buzzer can be turned on and off in the Settings Special settings Buzzer menu The default setting of the Buzzer is on and the Measuring mode is signed by cheeping continuously This cheeping can be turned off temporally and turned on again by pressing the Red button for approx 1 second Note In Measuring mode toggling the Buzzer is temporally only and is not saved For the next measurement the Buzzer state set in Settings menu will be valid XLMPUSREN73 page 8 O Inventure Automotive Electronics R amp D Inc XL Pro Table 2 Meanings of Cheeping Em 9 Turn On Off 1 System test OK 1 Press Display green button 1 Press Measuring red button a 1 Measuring Continuous End of measurement 1 Evaluation error 3 Change settings write memory 1 Battery low 5 Change batteries 5 43 Functional description 4 3 1 Power on You can turn on XL Meter by pressing the black On Off button for a
6. Regardless of the fact of an evaluation error the measured data are stored thus they can be uploaded to the PC for manual evaluation From Calibration Mode you can enter Display Mode by pressing either the green or the red button once In Display Mode you can switch from one measurement to another by pressing the display green button You do not have to wait until all the results are displayed but you can anytime interrupt one display cycle and enter the display cycle of the next measurement You can start a measurement data acquisition by pressing the red button Data acquisition can be stopped by pressing the display green button Stopping the measurement the device returns to display mode where the actual measurement results are displayed The results are scrolling on the display continuously thus the results can be easily noted The results are depending from the type of the measurement The detailed explanation of the different evaluations and results can be found at chapter 4 3 5 XLMPUSREN73 page 10 Inventure Automotive Electronics R amp D Inc XL Meter Pro 4 3 4 Measurement data acquisition 4 3 4 1 Acceleration measurement XL Meter uses a complete acceleration measurement system on a single monolithic IC It contains a polysilicon surface micromachined sensor and signal conditioning circuitry which implements a force balance control loop XL Meter is capable of measuring both positive and negative acceleratio
7. being less sensitive to the alignment of the accelerometer because the on axis signal is proportional to the cosine of the angle For example a 5 error in the orientation at 1 g or 1 g results in only a 0 4 error in the measurement For the calibration the sensitive axis of the sensor in XL Meter has to be aligned to match the orientation of the gravity vector measurement of 1g or to match the orientation opposite to the gravity vector measurement of 1g The calibration status of the instrument can be determined from the measured values In order to ensure the accuracy and the reproducibility of the calibration process Inventure Inc has developed a special calibration rack that serves the accurate fixing of the orientation of XL Meter TM A s r n r sin s n rH Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 39 XL Pro 8 3 3 Calibration procedure The measurement needed for calibration is composed of two parts First the sensing axis of XL Meter has to be aligned to match the orientation of the gravity vector of the Earth measurement of 1g by putting the instrument in the calibration device in a way that the display faces upwards The value displayed by the instrument in this position has to be noted down A Second turning XL Meter by 180 degrees the sensor axis of XL Meter has to be aligned to match the direction opposite to the gravity vector of the Earth measurement of 1
8. in this material is informative and subject to changes without any notice 2 Warranty There is a one year warranty on XL Meter M from the date of the original purchase The warranty covers any defect in materials or workmanship The warranty is valid only if XL Meter was operated under normal circumstances in regular use and the warranty sealing is not corrupted The warranty does not include the batteries damage from misuse or neglect As XL Meter has a well thought design it is thoroughly tested before release and it is composed of high quality parts there should be no need for regular maintenance of any parts of XL Meter during normal operation Therefore the box screws are sealed Should the seal be missing damaged or corrupted the warranty for XL Meter M is no longer valid Remember to save your sales receipt invoice in case you ever need warranty service Please refer to the serial number of your XL Meter M in case of any problems The serial number can be found on a label inside the battery compartment or can be displayed in Settings mode In case of warranty claims contact your local dealer or directly Inventure Inc See Section 9 3 Parts check list Check this list to be certain all components are included e XL Meter base unit e Special bag e RS 232 link cable The Inventure logo and name XL Meter and XL Vision are trademarks of Inventure Inc and are protected by copyright law Copyright by Inventure
9. m s2 Modules Service Brake Service Brake Plus Type of the Diagrams i Diagr Mees r mat i 0 2 4 8 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 sJ Frequency 200 Hz j Distance 88 57 m Initial Speed 89 56 i 2 Measurement 3 km h Measurement 4 Brake time 4 68 s Measurement 5 MFDD 9 89 m s2 Measurement 6 Measurement 7 Measurement 4 Measurement 8 Type of the measurement Service brake Frequency 200 Hz Distance 75 17 m Initial Speed 8882 0 2 4 5 8 40 12 14 16 18 20 22 24 26 28 30 32 34 36 38 s Figure 7 XL Vision PC software Fx vI Y XLMPUSREN73 page 30 O Inventure Automotive Electronics R amp D Inc XL Meter Pro 4 7 Compatibility with other Applications The outputs of XL Meter is compatible with the input of several widespread application used for accidental reconstruction and data process The Export function of XL Vision enables the exportation of the data to ASCII format The exported ASCII file can easily open by other application such as MS Excel 4 7 1 Accidental Reconstruction Application Virtual Crash and PC Crash are widespread accidental reconstruction applications Using the export function in the file menu allows the users a high level PC evaluation of the XL Meter results embedded to an accident simulation environment See example below Sp Virtual Crash
10. measurement with PC Crash as there is no automatic standstill level recognition in PC Crash A Virtual Crash is an Accidental Reconstruction Application 7 APC Crash is an Accidental Reconstruction Application CQ_ AAA FFv _ SSS SS SES O Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 31 XL Pro 5 System Characteristics 5 1 Absolute Maximum ratings Table 6 Absolute maximum ratings Circumstances Min Typ Max Recommended Operating C Voltage Operating V 5 2 6 0 18 0 5 2 Technical data Table 7 Technical data of XL MeterTM General features Number of measurements 3 8 Measurement storage capacity 200 Hz 1x80 s 2x40 s 5x40 s 3x80 s Display 16x2 character PLED or LCD with backlight PC interface RS 232 USB Dimensions HxWxD 50x97x110 mm Acceleration Measurement Longitudinal direction a Longitudinal direction a Range 5 0 5 0m s to 20 0 20 0m s Resolution 0 0021m s Acquisition Frequency 200 Hz to 25 Hz Lateral directions ay Range 5 0 5 0m s to 20 0 20 0m s Resolution 0 002m s Acquisition Frequency 200 Hz to 25 Hz Power supply External supply 6 18V DC Battery 4 AA type 5 3 MFDD calculation The primary objective of XL Meter M development was to create a massive but extremely easy to handle instrument by which an expe
11. recommended one the middle of the windscreen In these cases interchanging the measuring directions and or negating them can be very useful After proper settings the acceleration or deceleration measurement is possible even installing the equipment on one of the side windows Example installing the equipment in the back windscreen both directions must be negated 4 3 4 5 Data storage XL Meter has a storing capacity of eight different measurements and results at a time The data storage capacity is 40s 80s per measurement There is continuous data acquisition during one measurement so anytime the last 40 80 seconds of data measured are stored for future availability The sampling rate of the acceleration is 200Hz meaning that there is acceleration data available in every 5ms The battery is not needed to retain the stored measurement data because of the non volatile type memory so they will be accessible even after shut down The guaranteed data retention is over 200 years Note Should the built in evaluation program send an error message during on the spot evaluation the currently measured data are available in the memory thus can be uploaded and evaluated on a PC with the XL Vision program 4 3 4 6 Measurement identifier In XL Meter Pro Gamma each measurement has a unique identifier This is a number incremented by one at each measurement so the actual measurement identifier also can tell how many measurements we
12. v Meas Range X Next OK OK 14 0 14 0 m s2 Next OK Next v 5 0 45 0 m s Next Next OK Next OK Next Y y 20 0 20 0 m s 2 Next OK mew OK 4 y y Meas Range Y Next OK Next OK 2 6 Figure 3 Inventure Automotive Electronics R amp D Inc Structure of Settings Mode XLMPUSREN73 page 23 XL Pro 2 5 6 1 OK 14 0 14 0 m s Next OK Next Y 5 0 5 0 m s2 Next Next OK Next OK Next Y Y 20 0 420 0 m s N Next Next OK OK 7 2 isssz Y Y Direction X Normal Reversed Normal Reversed v v Direction Y Normal Reversed Normal Next r Reversed v v Evaluation Type Next OK OK Service Brake Next OK Next OK Acceleration Next Next OK Next OK Next Y No Evaluation Next OK OK v v Special Settings Next OK Next OK v Y Figure 4 Structure of Settings Mode XLMPUSREN73 page 24 Inventure Automotive Electronics R amp D Inc XL Pro
13. 00 operating system 4 6 4 Software installation Before starting installation please read carefully the readme txt file located in the root directory of the disk To start installation run the file named setup exe and follow the instructions Note The latest version of the XL Vision Standard software can be downloaded free of charge from the Internet web site of Inventure Inc http www inventure hu Y XL Vision 5 16003 Honda 521 Jada File Edit view Tools Window Help 0 B E E A 00 4 uot XL Info Panel x Proiect Center Instrument Info Measu 4 amp Data center Measurements pace amp Measurement 1 Measurement 2 Measurement 3 i Measurement 4 1 measurements Service Measurement 5 brake Measurement 6 m bd Data center istance 0 21 m 1 Initial Speed 266 km h IS Brake time 0 50 s Longitudinal acceleration MFDD 178 m s2 Lateral acceleration 0 2 4 5 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 s Brake trigger Measurement 2 8 Measurement 7 El Type of the measurement Service E Measurement 8 g brake Data center Frequency 200 Hz Datasources Distance 87 72 m rid Speed 10501 Longitudinal acceleration km h Lateral acceleration Brake time 4 67 s Brake trigger MFDD 8 33
14. 4 4 8 320 160 160 160 160 According to the different memory allocations the number of measuring locations can be 3 Base Memory 6 Memory Plus or 8 Memory Max The above table shows the storage capacity of each measuring location for the continuous storage of the measured longitudinal and lateral acceleration signals Note The accuracy of the measurement and the evaluation are effected by the measuring frequency Measurement Axis In normal case the longitudinal acceleration is in X direction while the lateral acceleration is in Y direction There is a possibility to interchange directions so the longitudinal acceleration will be in Y direction and the lateral acceleration will be in X direction It is important during the evaluation because in this way the lateral acceleration or deceleration can be evaluated as well O Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 17 XL Pro Measuring Ranges The Measuring Range determinates the minimum and the maximum acceleration level that is measured By changing the Measuring Range the User has the possibility to decide the trade off between high resolution versus wide range of acceleration Measuring Range can be set independently for directions X and Y and they can be configured separately Currently the following ranges are available Basic Range It is between 14 0 m s and 14 0 m s e Narrow Range It is be
15. 8 2 Brake Pedal Switch Installation The Brake Pedal Switch not supplied can be installed by a cable binder The cable binder should be put through the proper holes of the Brake Pedal Switch housing and should be tightened to the brake pedal itself XLMPUSREN73 page 26 Inventure Automotive Electronics R amp D Inc XL Pro 4 3 8 3 Checking Brake Trigger Input Functionality There is a possibility to check the functionality of the Brake Pedal Switch after installation When everything works properly a Tr sign appears in the right bottom corner of the display in Calibration Mode when the brake pedal is pushed pedal switch is active 4 3 8 4 Using Brake Trigger Input The Brake Trigger Input handles only one pedal touch per measurement To avoid the storage of double or unsuccessful pedal activations only the first pedal touch is detected during one measurement time In Measuring Mode the Tr sign in the right bottom corner of the display shows the status of the brake pedal The Tr sign appears when a pedal activation was detected Note When the measurement memory turns around the brake trigger storage is also erased If the Brake Trigger sign is erased the Tr sign also disappears from the display Important The time resolution of the brake trigger point depends on the sampling time The sampling time determines the smallest time interval that the brake trigger point can be 4 3 8 5 Displaying Bra
16. AZ Inventure Automotive Electronics on User s Manual Inventure XL Meter XL Pro Notes XLMPUSREN73 page 2 Inventure Automotive Electronics R amp D Inc XL Meter Pro Table of content 1 INTRODUCTION eee 4 2 WARRANT Y 4 3 PARTS GHEGKGEIS 4 3 1 OPTIONAL COMPLEMENTARY Sen Quy Qu 5 4 DESCRIPTION y m ELE 5 4 1 DEFINITION 5 4 25 OUTLOOK 5 iecit be Ne petto e benedi 5 4 3 FUNCTIONAL 9 4 4 BATTERY INSTALLATION REPLACEMENT a none naaa sess ssa nena 27 4 5 PG CONNECTION e res laani A das 28 4 6 XL VISIONTM DATA UPLOAD AND EVALUATION 28 44 PC GRASHICOMPATIBILITY esula ia Sm 31 5 SYSTEM U u 32 5 1 ABSOLUTE MAXIMUM RATINGS nn sess sl sal siis ee ee ee ass 32 5 2 TECHNICAL S mt aaa huwa kaha a ram iol BE at dE ia 32 5 3 MEDDiGAECULATION Li td Dia a a a cti Meena 32 6 HOW TO MEASURE WITH XL METERTM U 33 6 1 DETAILED DESCRIPTION OF THE MEASUREMENT PROCESS a 33 6 2 EVALUATING SERVICE BRAKE 34 6 3 SAGGELERATION EVALUATION a aka 35 T DISPLAY
17. R amp D Inc XLMPUSRENY3 page 9 XL Pro 4 3 2 1 Sensor Test This function is a perfect possibility to test the measuring capabilities of XL Meter as the user is able to test the performance of the acceleration sensor The sensor test can easily be performed using the earth s gravity as an etalon Turning the sensitive axis of XL Meter to the ground in ideal case the well known 9 8 m s should be seen and turning XL Meter upside down with 180 degrees 9 8 m s should be seen on the display To be able to decide whether the actual performance of the sensor enables to take correct legally and technically acceptable measurements or not the calibration status of the instrument should be determined See chapter 8 3 Note After power on the acceleration sensor may require some seconds to warm up and show the correct value 4 3 3 Display Mode Entering Display Mode automatically starts the display cycle that shows the measurement results XL Meter starts the display of the measurement results with the one that was active before power off The displayed measurement results under each measurement number are always the results of the last successfully evaluated measurement If there was an evaluation error there is no display cycle of measurement results but the evaluation error code is displayed under the corresponding measurement number The meaning of the error codes are listed in chapter 7 4 Note
18. ZS G GYI M SZAKI SZAK RT I BIZOTTS G 1111 Budapest M egyetem rkp 3 0 IGAZOL S a k sz l k m r si eredm nyeinek hiteless g r l az ENSZ EGB 13 sz m el r sa alapj n CERTIFICATE concerning the authenticity of the measurement results of the eguipment according to the ECE Regulation No 13 A k sz l k kereskedelmi megnevez se vagy jele XL METER Pro Alpha 1 0 Trade name or mark of the instrument A k sz l k rendeltet se Gyorsul s s lassul sm r m szer Function of the instrument Acceleration and Deceleration Meter A gy rt neve s c me INVENTURE Manufacturer s name and address Aut elektronikai Kutat s Fejleszt Kft H 1117 Budapest Er m u 6 A vizsg latok elv gz s vel megb zott m szaki szerv BUDAPESTI M SZAKI EGYETEM Technical service conducting type approval tests Igazs g gyi K zleked si Szakm rn ki Szak A k sz l k az id t 10 pontoss ggal m ri s k t tizedes jegy pontoss ggal jelzi ki A k sz l k gyorsul s rz kel je 12 7m s gyorsul si tartom nyban 1 sz zal k pontoss ggal rz keli a j rm sebess gv ltoz s t A sz molt sebess g s t rt kek pontoss ga meghaladja az egy tizedes jegyre kerek tett kijelz s pontoss g t A k sz l k az ENSZ EGB 13 sz m el r s ban foglalt k v naimaknak teljes m rt kben megfelel The time is measured with an accuracy of 10s and displayed w
19. ach measurement if Acceleration evaluation was set as Evaluation type in Settings menu Note The acceleration evaluation starts with the standstill level recognition If a measurement is too long the initial part of the measurement which contains the standstill level can be overwritten and the evaluation on PC can result false values The on the spot evaluation is right because it is independent from the stored data The automatic start recognition algorithm enables that the evaluation starts when the vehicle starts and not when the red button is pushed During measuring the actual speed and distance are displayed continuously The acceleration integrated once is the speed while integrated twice is the distance XLMPUSREN73 page 14 Inventure Automotive Electronics R amp D Inc XL Pro Table 3 Available intervals Speed ranges Distance ranges 0 20 km h 0 50 m 0 40 km h 0 100 m 0 60 km h 0 201 m eighth part of mile 0 80 km h 0 402 m a quarter mile 0 100 km h 0 120 km h 0 140 km h 0 180 km h The measuring stops automatically if the desired range is reached The measurement results are displayed immediately If it is not possible to reach the desired range pressing the green button can stop the measurement The measurement results are the followings e v km h the actual speed when the measuring is stopped e 5 the distance made from the start of the measurement till
20. ange between 14 0 m s and 14 0 m s e Measurement Range in Y direction Base Range between 14 0 m s and 14 0 m s e X direction Normal e Y direction Normal e Evaluation Service Brake e Auto Power off Yes e Buzzer Yes XLMPUSRENT73 page 20 Inventure Automotive Electronics R amp D Inc XL Pro e Trigger Output No Trigger Output 4 3 6 3 Identification data listed in Settings Mode 4 3 6 3 1 Serial Number The serial number of the instrument is not only printed on the label inside the battery compartment but also stored in the non volatile memory The serial number is listed in Setting Mode for easy reading 4 3 6 3 2 Firmware Version Number The software burnt into the instrument in the factory is called the Firmware The functionality of the instrument depends on the version of the Firmware The Firmware version number is listed in Setting Mode for easy reading 4 3 6 4 Structure of Settings Mode Setting Mode was organized in a way that it is easy to understand and easy to use Left button Green always mean NEXT so by pushing it one can go through the setting possibilities Right button Red can either be OK or End OK means a selection of a setting item or entering a level deeper in the menu End means to exit Setting Mode As language setting is the first item of Settings Mode and the changing takes effect immediately all the rest of the setting options will be displayed in the new lan
21. consumption is approximately tripled if the LCD backlight is on resulting in shorter battery lifetime XL MeterTM can be switched off by pressing the On Off button for a longer period of time more than 2 seconds If this action is successful you see a shutdown message on the screen before releasing the button 4 2 4 2 Display Button Green Button The results of all measurements can be displayed on the screen by pressing the green button From Calibration Mode you can enter Display Mode by pressing once either the green or the red button In Display Mode you can switch from one measurement to another by pressing the display button You do not have to wait until all the results are displayed but you can anytime interrupt one display cycle and enter the display cycle of the next measurement You can start a measurement data acquisition by pressing the red button To stop data acquisition press the display green button The evaluation automatically if such evaluation was chosen starts after the stoppage the measurement Finishing the evaluation it enters Display Mode again and the currently performed measurement results will be displayed 4 2 4 3 Measurement Button Red Button Starting a measurement data acquisition can be invoked by the measurement button You can also use the red button to enter Display Mode from Calibration Mode by pressing it once Measurement can only be started from Display Mode Anytime the currently displayed m
22. d After the car has stopped first wait that it reaches the position of absolute rest Then you have to wait for one second more because of the automatic standstill level recognition and only after that should press the display button stop the data acquisition So to terminate data acquisition and to start the evaluation process press the display button Then data acquisition is aborted and the evaluation procedure is started automatically After finishing evaluation XL Meter enters Display Mode and displays the result of the evaluation Since XL Meter has a capacity of storing eight independent measurements and their results in its memory the above described steps can be performed eight times without data loss thus the measurement series can be finished even without uploading them 6 2 1 Quick guide a reminder summary of how to make measurement 1 Install XL Meter onto the windscreen 2 Turniton 3 Standing on a horizontal surface calibrate XL Meter to approximately 0 0 m s level 1 Three six or eight different measurements are available depending on the configuration XLMPUSREN73 page 34 O Inventure Automotive Electronics R amp D Inc XL Pro Press the display or measurement button to enter Display Mode Select one measurement that will be overwritten Start data acquisition by pressing the measurement red button Drive to the place of measurement Brake definitively continuously un
23. d to be suitable easy to handle and easy to install for acceleration measurement purposes The jointed arm on the top enables the calibration of the zero level when installed on the windscreen by the vacuum cup Under the bottom cover the AA type battery holder can be found See detailed in chapter 4 4 4 2 2 Connectors There are two connectors on the back panel of XL Meter The nine pole SUB D type is the RS 232 compatible interface connector that enables communication to a PC The PC link cable supplied should be connected here during data upload The same connector is used for the input of the brake pedal switch and the output of the trigger signal Q Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 5 XL Meter Pro Table 1 The pin assignment of the nine pole D SUB connector RS 232 receive Brake Trigger Input 1 Brake Trigger Input 1 GND System Ground Trigger Output TI Optional Analogue Input Brake Trigger Input 2 Optional Optional VCC The round one is the external power supply DC in connector Use only approved external adapter for powering XL Meter The housing of XL Meter is negative grounded the pinout of the external power supply connector can be seen on Figure 1 Figure 1 The pinout of the external power supply connector Note The maximum input voltage allowed is 18 0V 4 2 3 Suspension XL Meter can be installed in seconds due to its suitable design of sus
24. e used in XL Meter has two characteristics value the offset and the sensitivity Offset means the output value when the input is zero in other words where the characteristic curve crosses axis Y when axis X is zero Sensitivity means the slope of the characteristic curve lt gives the output value change for a specific change in the input is obvious from the above definitions that it is only the sensor sensitivity that has effect to the precision of the measurement results the offset is only a beauty factor This means that if the offset of the instrument is greater than 1 m s2 but the sensitivity error is less then 1 the instrument is still capable of perform valid measurements If the sensitivity error is out of the predefined 1 range than a recalibration is required before the instrument can perform valid measurements 8 3 2 Calibration theory The force of gravity is the most stable accurate and convenient acceleration reference available The calibration of XL Meter M takes place with the use of the acceleration of gravity as an etalon and an approved calibration rack During the calibration process the acceleration value displayed by XL Meter has to be compared to the value of acceleration due to gravity g The basis of the calibration method is to make measurements at 1 g and 1 g Both the offset and the sensitivity of XL Meter can be determined by these two measurements This method has the advantage of
25. easurement will be overwritten by the new measurement You do not have to wait until all the results are displayed but you can anytime interrupt one display cycle and start data acquisition Data acquisition can be stopped by the display green button Note Before starting measuring the XL Meter Pro Gamma will ask to overwrite the actual measurement If yes then the measurement starts if No it returns to Display Mode In this way you can avoid to overwrite a measurement accidentally 4 2 5 Display The display is a 2x16 character alphanumeric display it features high contrast easy to read characters and numbers There are two kinds of displays depending on the technology Liquid Crystal Display LCD with switchable backlight and PLED with switchable brightness sx r mx s T M A nn Ta Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 7 XL Pro 4 2 5 1 LCD There is a possibility to illuminate the LCD during night measurements The LCD backlight can be toggled turned on off by simply pressing the On Off button See details in chapter 4 2 4 1 Note The LCD backlight consumes relatively high energy meaning that the continuous usage of the LCD backlight can radically reduce the battery lifetime So please make sure that the light is off when it is not necessary 4 2 5 2 PLED The PLED display uses yellow green pixels to show characters While the LCD display has switchable backlight the
26. echnical experts point of view They verified that the measurement result calculation algorithm and the result accuracy are according to the corresponding ECE regulations The result of the investigation can be found in Appendix 1 8 2 Test by an OMH accredited laboratory OMH stands for the Hungarian National Office of Measures Orsz gos M r s gyi Hivatal OMH itself does not deal with verification or calibration of devices measuring acceleration or deceleration For this task an OMH accredited laboratory in Hungary is the B k sy Gy rgy Acoustic Research Laboratory at the Department of Telecommunications and Telematics in the Technical University of Budapest The extract form the minutes prepared by the Acoustic Research Laboratory is shown in Appendix 2 The minutes state that the features of XL Meter enable calibration using the field of gravity as etalon 9 81 m s and a device keeping XL Meter in a vertical position XLMPUSREN73 page 38 O Inventure Automotive Electronics R amp D Inc XL Meter Pro 8 33 Calibration The principal characteristic of measuring devices is accuracy which needs to be controlled from time to time The owner and user of XL Meter himself can control the calibration of his instrument occasionally or on a regular basis according to the requirements of his own quality system and can put the results in the Calibration Minutes 8 3 1 Sensor characteristics A linear sensor like the on
27. ervice brake performance evaluation message Normally XLMPUSREN73 page 36 Inventure Automotive Electronics R amp D Inc XL Pro you should not get any system errors during the lifetime of the instrument Service brake performance errors can happen sometimes especially if an inexperienced user operates the instrument Should any error occur please look up the error code in the following table read carefully the description about the source of the problem and follow the suggested actions to prevent errors the next time If the error still remains please note the error code and try to specify the situation when it occurs then contact Inventure Automotive to be able to find a fast and satisfying solution to the problem In case of a service brake performance evaluation error message the error code appears right below the corresponding measurement number and XL Meter can be further operated normally The evaluation errors are stored so when the measurement results are listed next time the error number is displayed instead of the wrong evaluation results In case of a system error the only way to continue is to shut down XL Meter and turn it on again with the black button 7 4 Error Codes Table 8 Explanations of Error Codes Ec Description What to do 10 47 System errors Contact Inventure Automotive to describe the situation and the resulting error code 48 Non valid password in Use XL Vision V software to u
28. eter Pro 9 How to contact Inventure Inventure provides customer support via its World Wide Web WWW site The Inventure Automotive web site is available by using your favourite Internet browser to attach to www inventure hu Our web site provides a variety of services Users may download the latest XL Vision software tool read up to date information about the company the products application possibilities and the services Frequently asked questions and the corresponding answers are also available on the Inventure site If you have problems questions suggestions or you just want to express your opinion about us or our products please feel free to write an email to us and we surely will find a way to the solution support inventure hu Come and visit our web site tell us your experience concerning our product fill out the registration form to be able to inform you directly about the latest results of research and development and the continuously improving customer services Your comments are also welcome under the following address Inventure Automotive Electronics R amp D Inc H 1111 Budapest Karinthy Frigyes ut 26 HUNGARY Phone 36 1 381 0970 Fax 36 1 361 0971 Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 41 10 XL Pro Appendix og mictctbtcobboob NOK Pese e ese eee ele TI Id BUDAPESTI M SZAKI EGYETEM IGA
29. g by putting the instrument in the calibration device in a way that the display faces downwards The value displayed by the instrument in this position has to be noted down as well The offset and the sensitivity can be calculated with the two measured values using the following formulas Let A be the acceleration value noted down from the display in 10 direction Let B be the acceleration value noted down from the display in 1g direction Let g be the value of gravity which depends to a small extent on the degree of latitude of the place where the measurement is taken approximately 9 81 m s Then the offset and the sensitivity S Offset A B 2 S A B 2g XL Meter makes measurements in the acceleration range of 12 7m s 12 7m s and displays the sensed value of acceleration in 0 1m s resolution The sensitivity of XL Meter has an accuracy of 1 which means that the value of S has to fall within the following boundaries 0 99 lt S lt 1 01 Should XL Meter perform within the limit values specified above the calibration of the instrument is satisfactory Note The compliance with the limit values set out for the sensitivity S above is equivalent to the compliance of the measured A and B values to the limits below 49 7m s lt gt 9 9m s 9 9m s lt B gt 9 7m s XLMPUSREN73 page 40 Inventure Automotive Electronics R amp D Inc XL M
30. guage To make navigation in Settings Mode even easier the following figures show the structure of the options O Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 21 XL Pro Next Settings Language Next OK Next Next English Next OK Next Y Deutsch Next Weiter OK Next Y Magyar Next Tov bb OK Next Y Italiano Next Avanti OK OK OK Next v Polski Next Nastepny OK Next Y Slovensky Next Dalej OK OK gt oe Next Next IIOTOM OK Y Y Measure Settings Next OK Next 2 4 OK Measuring Freq Next OK Next OK 5 English Figure 2 XLMPUSREN73 page 22 Structure of Settings Mode Inventure Automotive Electronics R amp D Inc XL Pro 2 3 4 OK 200Hz M Next OK Next v 100Hz Next OK 3 OK Next Next Next 50Hz Next OK OK Next v 25Hz Next OK vY Y S pan X Long Y Lat Normal Reversed Next Next Normal Reversed Y
31. he diagram and its results with the XL Vision evaluation program In case a need for higher initial speed on the spot evaluation contact Inventure Automotive 126 MFDD MFDD too large The value of the MFDD MFDD exceeded calculated value is too large probably the maximal 100 m s Upload the false result measurement and check the diagram and its results with the XL Vision evaluation program In case a need for higher MFDD on the spot evaluation contact Inventure Automotive XL Meter evaluation error 130 Brake end time could not Upload measurement data to the PC with XL recognized Vision and check why the brake end time could not be found See also section 4 3 5 132 Brake start time could not be Upload measurement data to the PC with XL recognized Vision and check why the brake start time could not be found See also section 4 3 5 8 Certification Calibration The XL Meter Pro type universal acceleration and deceleration meter was tested and verified by two independent organizations In both cases the instrument fulfilled the requirements with excellent results The appendix contains the copies of the certificates 8 1 Test by the Technical University of Budapest The Department of Road Vehicles in the Technical University of Budapest carried out a series of tests to prove the applicability of XL Meter for evaluating brake performance of different vehicles from the t
32. he measurement Service brake Frequency 200 Hz Distance 75 17 m Initial Speed 88 82 km h Brake time 4 33 MFDD 9 48 m s2 Measurement 5 Type of the measurement Service brake v The XL Vision 4 0 program can provide remote control feature Pushing of each button of the instrument can be simulated from the program so full functionality can be achieved using the PC The measurement number can be chosen the measurement can be started and stopped the program can also display a warning message to avoid overwriting a message accidentally then with the help of synchronization the measurement results can be displayed on the screen Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 29 XL Meter Pro Using the features of Synchronization and Remote Control the XL Meter Pro Gamma can be controlled easily while the measurement parameters and results can be seen on the PS s screen 4 6 3 System requirements XL Vision is a 32 bit Windows application it runs under Win95 98 ME or 2000 NT environment If you are going to install the software your computer needs to meet the following minimum requirements IBM PC or 100 compatible Pentium 2 processor or better CD ROM drive 7 megabytes MB or more free hard disk space HDD 2 MB or more RAMA RS 232 serial communication port or a free USB port plus the USB Cable Kit Microsoft Windows 98 ME XP NT 20
33. i Kutat s Fejleszt Kft H 1117 Budapest Er m u 6 4 A m r s ideje 1999 j nius 22 5 A m r st v gezte D niel Istv n 6 Az eredm nyeket l sd a mell kletekben 7 A kalibr l st az OMH MAB 049 sz hat rozat alapj n v gezz k Budapest 1999 j nius 22 Dr Andr s D niel Istv n a laborat rium vezet je fizikus Appendix 2 Type approval certificate issued by the accredited laboratory of the National Office of Measures OMH Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 43 Automotive Electronics http www nventure hu
34. ith an accuracy of two decimal places in the instrument The acceleration sensor of the instrument is capable of sensing the velocity changes of the vehicle in the acceleration range of 12 7m s with an accuracy of 1 per cent The accuracy of the calculated velocity and distance values exceed the accuracy of the displayed values rounded to one decimal place The instrument absolutely fulfills the requirements of the ECE Regulation No 13 A vizsg latok eredm nyei alapj n meg llap tom hogy a k sz l k alkalmas g pj rm vek f krendszereinek min s t s re Based on the results of the investigation hereby state that the instrument is approved for evaluating brake systems of vehicles paran Matuscsak Tam s IMSZB eln ke Budapest 1998 szeptember 1 Dr Melegh G bor Appendix 1 The certificate of approval of XL MeterTM issued by the Technical University of Budapest XLMPUSREN73 page 42 Inventure Automotive Electronics R amp D Inc XL Pro BME Akusztikai Kutat Laborat rium Bizony tv ny sz ma 110 1112 Budapest Buda rsi t 45 oldalsz m 1 3 Kalibr l si bizony tv ny s t pusvizsg lat 1 A m r eszk z megnevez se lassul sm r t pusa XL Meter gy rt si sz ma t pusvizsg lat 2 A gy rt k neve Inventure Autoelektronikai Kutat s Fejleszt Kft 3 A kalibr l st megrendel neve s c me Inventure Autoelektronika
35. izontal surface With the help of the jointed arm on the top of the instrument calibrate XL Meter to approximately 0 0 m s level Note It is not essential to calibrate exactly to 0 0 m s because there is a built in automatic standstill level recognition in XL Meter Standstill level stands for the acceleration level at which the vehicle is stopped and does not move at all After successful calibration to enter Display Mode press the display or measurement button Select the measurement location that you want to be overwritten by the display button You do not have to wait until the end of the display cycle you can anytime interrupt and change to another measurement or start data acquisition To start data acquisition press the measurement red button Press it again to overwrite selected measurement The measurement processes are different according to the selected evaluation so we provide detailed information in the following chapters 6 2 Evaluating Service Brake Performance To start data acquisition press the measurement red button Drive to the place of measurement No matter how early you started data acquisition the recording is continuous and anytime the last 40 or 80 seconds of measurement data is available in the memory It is much more convenient to start data acquisition early even if you do not know exactly when and where the brake test will be performed Brake definitively continuously until the vehicle is stoppe
36. ke Trigger results With the help of a Brake Pedal Switch e g the brake delay time can be measured The successful activation of the brake pedal can immediately be seen on the display of the XL Meter instrument Evaluation of Brake Trigger timing requires running Service Brake Plus module not supplied under XL Vision 4 4 Battery installation replacement The battery compartment for the 4 AA size batteries can be found under the bottom cover XL Meter operates with 4 AA type batteries supplied There is a built in battery check function in the XL It shows a Battery Low message at every start up if the batteries are needed to be replaced in the near future That means that when the Battery Low message appears at power on by pressing the display green or the measurement red button the XL Meter M is still capable to perform a couple of measurements but it indicates that the batteries should be replaced as soon as possible There are no further warning messages in case the batteries are not replaced thus Inventure can not guarantee the specified performance if the batteries are too low The batteries can be replaced by following the next instructions 1 Shut down XL Meter 2 Turn the base unit over unscrew the two screws PH2 that holds the battery cover The batteries are stored under the removable bottom cover O Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 27 XL Pro Remo
37. language of the instrument Currently the following languages are available e English e Deutsch German e Magyar Hungarian A language setting is the first item in Settings Mode and the changing takes effect immediately Note Additional languages can be implemented upon special request 4 3 6 2 2 Measuring Parameters XLMPUSREN73 page 16 Inventure Automotive Electronics R amp D Inc XL Pro Measuring Frequency Sampling Time The Measuring Frequency Sampling Time determinates the time between two samplings By changing the Measuring Frequency the User has the possibility to decide the trade off between high sampling rates versus long measuring time The Measuring Frequency also has an influence on the accuracy of the measurement The higher the Measuring Frequency is the more accurate the measurements are This is why Inventure suggests 200 Hz measuring frequency for Service Brake Performance evaluation tests Currently the following frequencies are available e 200 Hz 5 ms sampling time e 100 Hz 10 ms sampling time e 50 Hz 20 ms sampling time e 25 Hz 40 ms sampling time The following table shows the memory allocation and the available time frame measurement length depending on the selected measuring frequency Table 4 Memory allocations Memory Plus _ eee pw Toms ws gt e Measurement length s Measurement length s Meas length s 20 5 80 4
38. lt A Xx 504 p d gt a 2 2 XL 0 1 12 Exo gums 8 100 7 1 0 1 12 1 EE Figure 6 XL Vision 4 0 screenshc XL Info Panel x 4 6 1 Synchronization This function makes it possible that XL Vision 4 0 program can show on the screen immediately the actual data displayed by XL Meter and also the measurement results of every measurement This function enables that the measurements results and state of the device can be displayed immediately in XL Vision XL Vision 4 0 program The information is displayed on XL Info Panel The XL Meter Pro Gamma can proceed the synchronization by clicking on a button Synchronization contains the following information the present state of the equipment the actual measurement number the parameters and the results of all measurements 4 6 2 Remote Control Actual measurement 1 Instrument state Calibration Measurement 1 Type of the measurement Service brake Frequency 200 Hz Distance 0 21 Initial Speed 2 66 km h Brake time 0 50 s MFDD 1 78 m s2 Measurement 2 Type of the measurement Service brake Frequency 200 Hz Distance 87 72 Initial Speed 102 01 km h Brake time 4 67 s MFDD 8 93 m s2 Measurement 3 Type of the measurement Service brake Frequency 200 Hz Distance 88 57 m Initial Speed 89 56 km h Brake time 4 68 s MFDD 9 89 m s2 Measurement 4 Type of t
39. n to a maximum level of 2 g The characteristic of the acceleration sensor assures the quality of the measurement results 4 3 4 2 Acceleration sensor XL Meter uses a differential capacitor acceleration sensor The differential capacitor acceleration sensor consists of independent fixed plates and central plates attached to the main beam that moves in response to an applied acceleration The two capacitors are series connected forming a capacitive divider with a common movable central plate When at rest the values of the two capacitors are the same and therefore the voltage output at their electrical centre is zero When acceleration is applied the common central plate moves closer to one of the fixed plates while moving further from the other This creates a mismatch in the two capacitances resulting in an output signal at the central plate The output amplitude of the signal varies directly with the amount of acceleration experienced by the sensor You can simply check the performance of the acceleration sensor in Calibration Mode See detailed in sections 4 3 2 and 8 3 Note Right after power on the acceleration sensor may require some seconds to warm up and show the correct value Note The maximum shock survived by the acceleration sensor for 0 5ms is 500g in powered and 1000g in unpowered status Remember that drops onto hard surface can cause shocks of greater than 1000g so care should be taken in handling XL Meter to
40. ng the brake start time from the brake end time The initial vehicle speed value is calculated by the simple numerical integration of the acceleration data in the interval of the brake time Brake distance So is calculated by the duplicate integration of the acceleration data in the interval of the brake time The calculation method of MFDD is described section 5 3 The successful evaluation gives the following results e So m distance in the time of braking Tbr e Vo km h initial vehicle speed at the time of braking e Tbr s time from the start till the end of braking e MFDD m s2 is a standard measurement number described in ECE Regulation No 13 European Braking Regulations ECE R 13 amp EEC 71 320 Example The results get from evaluation are as follows So 18 17 m Vo 57 42 km h Tbr 2 17 sec MFDD 7 27 m s The meanings of them are the following The initial soeed of the vehicle was 57 42 km h when started braking It took 2 17 seconds to stop and the vehicle went 18 17 meter in this time The MFDD Averaged maximal deceleration is 7 27 m s 4 3 5 2 Acceleration Evaluation The XL Meter Pro Gamma offers a possibility to analyse the acceleration or dynamics of a vehicle This feature can evaluate the accelerations capability of a vehicle in different intervals which makes possible to compare different types of vehicles objectively and quickly The range can be speed as well as distance The limit can be chosen before e
41. p D Inc XL Pro Service Brake See chapter 4 3 5 for more information Acceleration See chapter 4 3 5 for more information No Evaluation In this case only data acquisition is performed 4 3 6 2 4 Special Settings e Auto Power Off e Buzzer e Trigger Output Auto Power Off This function can prevent the instrument from turning on unintentionally lt prevents batteries from consuming when the black button is pushed accidentally lt provides two types of protection delayed power on and automatic power off e Delayed power on If this function is active the instrument will be powered on by pressing On Off button black button for approx 2 seconds Short button press will not turn the instrument on e Automatic power off This function will switch off the instrument in Calibration mode after approx 4 minutes This means that if the instrument remains in Calibration mode and it does not enter Display mode the instrument will be powered off in approx 4 minutes The only exception is that case when data uploading starts in Calibration mode because data communication on the serial port overrides Auto Power Off function Buzzer The Buzzer can be enabled or disabled in this step Note If the buzzer is enabled it chirps when a button is pressed acknowledgement or the state of the instrument is changed warning During measurement it cheeps continuously by default but it can be turned off temporall
42. pension XL Meter is suspended by a high quality vacuum cup Simply putting XL Meter to the desired point of the windscreen or any other fine surface and turning the knob of the vacuum cup is sufficient for a strong installation Due to the high quality of the Veribor vacuum cup XL MeterTM has a particularly strong hold on the surface where it was installed 4 2 4 Control buttons XL Meter is extremely simple to operate Three buttons can operate it Each button has a different color and a dedicated function described below 4 2 4 1 On Off Button Black Button The On Off button has two functions the first is to control the power supply and the second is to control the backlight or the brightness of the display If the XL Meter is off you can XLMPUSREN73 page 6 Inventure Automotive Electronics R amp D Inc XL Pro switch it on by pressing the On Off button once for a couple of seconds After switching on pressing the On Off Button for a short period of time less than 2 sec will result in toggling the backlight or the brightness of the display depending on the type of the display LCD or PLED This means that the backlight brightness will turn on or increase by pressing the button once and turn off or decrease by pressing it for the second time turn on or increase also for the third time and so on It is important to note that the LCD backlight should only be used when it is necessary as the power
43. pload PC XL Meter communication measurement data from XL Meter 49 85 and Internal errors Contact Inventure Automotive to describe the 140 180 situation and the resulting error code 7 5 Plausibility Error Codes Table 9 Explanations of Error Codes 90 In case of acceleration evaluation Try to start the vehicle with higher the device couldn t recognize the acceleration If you cannot increase the start acceleration please contact with Inventure Automotive 91 Standstill level not found The device After the vehicle stop wait 1 seconds before cannot calculate the standstill level pressing the green button correction The reason for this error is the too early stoppage 100 Measurement length too short The length of a measurement must be at least 1 second 122 Brake distance So too large The The value of the braking distance So calculated value is too large probably exceeded the maximal 1000 m Upload the false result measurement and check the diagram and its results with the XL Vision evaluation x z rc rr h TP r Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 37 XL Pro distance on the spot evaluation contact Inventure Automotive 124 Initial speed Vo too large The The value of the initial speed Vo exceeded calculated value is too large probably the maximal 1000 km h Upload the false result measurement and check t
44. pprox 2 seconds See detailed in chapter 4 2 4 1 Short button press will not turn the instrument on this feature prevents the instrument from turning on unintentionally or accidentally When the instrument is turned on it cheeps one to sign See chapter 4 2 6 for details and then the instrument name XL Meter Pro Gamma is displayed in the first line of the display for identification purpose At power on the LCD backlight is turned on while the system is checked internally for errors and the battery performance is evaluated If the are no problems the System Check OK message can be read on the display After this the backlight is turned off automatically and XL Meter enters Calibration Mode 4 3 2 Calibration Mode Entering Calibration Mode is automatic after System Check In Calibration Mode the component of the gravity acceleration 9 8 m s in line with the sensing axis of XL MeterTM can be read on the display with 0 1s refresh rate Calibration Mode has tree purposes In calibration mode both the longitudinal a and lateral ay acceleration components are displayed simultaneously The objectives of calibration e After installation before starting a measurement XL Meter M has to be set to the 0 0m s calibration level This procedure was implemented in order to have maximum resolution during measurement e Sensor test possibility See detailed in chapter 4 3 2 7 yz x V h R F rv GEN Inventure Automotive Electronics
45. re carried out altogether Three six or eight different measurements are available depending on the configuration XLMPUSRENT73 page 12 Inventure Automotive Electronics R amp D Inc XL Meter Pro 4 3 5 On the spot evaluation XL Meter has several built in evaluation programs to enable fast on the spot evaluation of service brake performance or acceleration The type of evaluation can be chosen in Settings menu and it must be chosen prior to starting the measurement For a measurement only one on the spot evaluation can be chosen but if you upload the measured data to a PC the same measurement can be evaluated in different ways Available On the spot evaluations e No Evaluation optional Only data acquisition is performed Useful for measurements with no built in evaluation e Service Brake Evaluation default After finishing data acquisition this evaluation is started automatically The evaluation is used to qualify the vehicle service brakes Useful for on the spot investigation of accidents creation of forensic engineering reports on accidents the task of service brakes testers e Acceleration Evaluation optional The evaluation running parallel with acquisition is used to analyse the vehicle acceleration and dynamic Useful for journalists of motoring or car motor mechanics drag race and tuning fans e Retarder Evaluation optional For the moment it can be performed only in PC but in the future it
46. rt can on the spot evaluate braking tests and the performance of braking systems Depending on the configuration Depending on the configuration Only with USB Support kit XLMPUSRENT73 page 32 Inventure Automotive Electronics R amp D Inc XL Pro The legal regulations for braking tests are described in ECE Regulation No 13 According to this The performance prescribed for braking systems is based on the stopping distance and or the mean fully developed deceleration The performance of a braking system shall be determined by measuring the stopping distance in relation to the initial speed of the vehicle and or by measuring the mean fully developed deceleration during the test The mean fully developed deceleration MFDD is calculated as the deceleration averaged with respect to the distance over the interval Vb to Ve according to the following formula 2 2 MFDD 1 Ve m s 25 92 se sy where Vo initial vehicle speed in km h Vb vehicle speed at 0 8 Vo in km h Ve vehicle speed at 0 1 Vo in km h Sb distance travelled between Vo and Vb in meters Se distance travelled between Vo and Ve in meters According to the regulation the accuracy of the mean fully developed deceleration shall be within 3 per cent XL Meter fully complies with this regulation See Appendix 1 For the approval of any type of vehicle the braking performance shall be measured during road
47. stops automatically It can be stopped manually by pressing the green button In this case the results will be the actual values After stopping the measurement the device returns to display mode where the results are displayed automatically 6 3 1 Quick guide a reminder summary of how to make measurement 1 Install XL Meter M onto the windscreen Turn it on Standing on a horizontal surface calibrate XL Meter to approximately 0 0 m s level Press the display or measurement button to enter Display Mode Drive the vehicle to the start position UT O Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 35 XL Meter Pro Select one measurement that will be overwritten Start the measurement by pressing the measurement red button Press the measurement button one more to acknowledge the overwriting 9 Choose the desired range 10 Wait the initialisation Start when the Start label is displayed 11 Accelerate until reaching the limits 12 Wait for the result of the evaluation procedure 13 Continue with step 5 7 Display Messages The display messages are organized into three different groups like normal operation warning and error messages The language of the display messages is selectable The desired display language has to be defined when placing an order for XL Meter 7 1 Operation Messages These messages are displayed during normal operation These include the Sys
48. supplied that supports XL Meter having a wide and continuously broadening scale of features All the measurement data can be uploaded to the PC and fully evaluated by XL Vision The objective of the continuously improving services of XL Vision is to support the experts by offering a fully featured PC evaluation of the acceleration and deceleration performance of the different vehicles like passenger cars commercial vehicles buses agricultural machinery stacker trucks etc XL Vision not only extends XL Meter with the visualization of the measurement data but also gives the opportunity to measure exactly time distance momentary velocity and acceleration values and enables average acceleration calculation The documentation and archiving of measurements is easy with the help of XL Vision The measurement results can be printed in a measurement report form containing all relevant data and information XLMPUSREN73 page 28 Inventure Automotive Electronics R amp D Inc Ede View Teos Window 6 0 6 Proiect Conter XL Meter Pro Y XL sion C Documents and Settings Szalay My Documents test iuimeter Belgium TUUR 3 xi 18 xl o n 1 at or Modules Service Dusko Diagram gt Dingane A 5 T x T ais UB PE 1 o gt y 1 H 7 m a io oh A
49. tem Check OK Calibration Mode Display Mode etc messages These messages inform the user precisely about the actual operation mode of the instrument 7 2 Warning messages The device contains a power level monitor algorithm which is aim to monitor the overvoltage and the battery level at power on and before starting the measurement The abnormality is indicated with beeping and warning message There are two types of warning messages The first one is for the low battery level The device displays Low Battery If the voltage of the battery reached the lower threshold and the batteries should be replaced as soon as possible Should you get a Battery Low message by pressing the green or red button XL MeterTM will still be able work So you do not have to replace batteries immediately but as soon as possible If the voltage of the battery reaches the lowest threshold the XL Meter M is not operable so it shut down automatically The second warning message is the Overvoltage message This means that the user exceeded the predefined maximum input voltage 18 0V As overvoltage can cause severe damages to the circuit this event is stored in the failure memory of XL Meter M and the warranty is no longer valid Should this happen XL Meter displays the Overvoltage message and shuts down automatically 7 3 Error messages There are two types of error messages implemented The first type is the system error message the second type is the s
50. tests conducted in the conditions specified by the ECE Regulation No 13 6 How to measure with XL 6 1 Detailed description of the measurement process Install XL Meter onto the windscreen Try to find a place in the middle to be able to install XL Meter into the driving direction Remember the sensitive axis of XL Meter which should always be oriented to the direction of the acceleration to be measured The X Y swapping and X Y negate function of XL Meter M enables the installation in any mode independent from the axis If the installation into to the windscreen is not possible broken windscreen the XL Meter M can be installed into the back windscreen In these cases you have to pay attention at the proper settings of axis and directions If XL Meter is battery operated now then turn it on otherwise install the 12V power supply cable first The external power supply cable not supplied should be connected to the standard DC connector at the back panel of XL Meter Note The maximum allowed input voltage is 18 0V After having successful system check the instrument enters Calibration Mode automatically In Calibration Mode the component of the gravity acceleration in line with the sensing axis of s FT m T Se ee J Vs Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 33 XL Pro XL Meter can be read on the display Drive the vehicle to an approximately hor
51. the end of it e t s the time passed between the start the end Example The evaluation results are as follows s 143 1 m v 95 69 km h t 10 73 s The meanings of them are the following The vehicle speed was 95 69 km h when the button was pushed at the end of the measurement This speed was reached in 10 73 seconds while the vehicle moved 143 1 meter 4 3 6 Settings Mode This operation mode enables the user to change certain parameters or characteristics of the measuring instrument 4 3 6 1 Entering Settings Mode Settings Mode can be accessed by pushing and holding down the green button right after power on through the message System Test OK When the display shows Settings the XL Meter Pro Beta has entered Settings Mode 5 More intervals are available for user s request Ha A A E n A R sya R A O Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 15 XL Meter Pro 4 3 6 2 Setting Possibilities The following items can be set in Settings Mode e Language Measuring Parameters Measuring Frequency Measurement Axis Measurement Range in X direction Measurement Range in Y direction X direction Y direction Type of Evaluation Special Settings Auto Power Off Buzzer Trigger Output e Reset Defaults In addition the following identification information can be get in Settings Mode e Serial Number e Firmware Version Number 4 3 6 2 1 Language The User can set the display
52. til the vehicle is stopped After the car has stopped wait for one second in absolute rest then press the display button 10 Wait for the result of the evaluation procedure 11 To make another measurement choose the next measurement that will be overwritten 12 Continue with step 6 O o NO 0r 6 3 Acceleration evaluation Attention The vehicle must be on the start position before starting the measurement Accepting the overwriting you will get to the acceleration settings menu Here you have to choose the thresholds to be reached during the measurement Reaching the chosen speed or distance limit will finish the measurement You can choose between the different ranges by pushing the green button If the vehicle is not on the start position it is the last time it can be driven to If we have chosen the desired range using the green button it can be acknowledged by pressing the red button After accepting the range the measurement starts automatically At the beginning of the measurement an automatic standstill level conversation is done In this state you Initialise is displayed When the standstill level has found and the acceleration can be started the device displays Start The automatic start recognition enables that the evaluation starts exactly at the start of the vehicle The device recognizes the start and it displays the actual speed and distance values By reaching the chosen threshold the measurement
53. tween 5 0 m s and 5 0 m s e Wide Range It is between 20 0 m s and 20 0 m s The following table shows the advantages and the suggested applications of each measuring range settings Table 5 Measuring Range Settings Measuring Range Dir Type Name ad Advantages Application 5 Symm Basic 14 0 14 0 Normal Traffic Range 0 1 m s2 res Service Brake Eval Veh Dynamics 8 Symm Wide 20 0 20 0 Wide acceleration range Small collision lt 5 km h x Symm Narrow 5 0 5 0 Higher Resolution 0 symm Retarder Brake Eval Light car tests 5 Symm Basic 14 0 14 0 Normal Traffic Range 0 1 m s2 res Vehicle Dynamics Measurement E Symm Wide 20 0 20 0 Wide acceleration range Small collision lt 5 km h Narrow 5 0 5 0 Higher Resolution 0 symm Slight Steer movement SBR Eval Note The measurement ranges has no effect on Evaluation Measurement Directions In the Settings menu the directions of X and Y axis can be set The measuring direction can be Normal default or Reversed meaning that the measured values are negated The measuring direction can be set independently for axis X and axis Y Further information about the measuring directions can be found in chapter 4 3 4 4 4 3 6 2 3 Evaluation The type of the evaluation can be as follows e Service Brake e Acceleration e No Evaluation XLMPUSREN73 page 18 Inventure Automotive Electronics R am
54. untitled Adat Szerkeszt Eszk z k Segits g os L J rm vek amp 3 Megnevez s lt Akad ly Aut busz Szem lyg pkocsi 3 5V8 32V 354 PS 4 Aceca 3 5 VB 32V 354 PS 4 6 VB 32V 307 PS Ace Aceca 4 6 VB 32V 307 PS 3 Superblower MKIV CRS 4 9 V8 4 Superblower MKIV CRS 4 9 v8 21 _ Alfa Romeo Ag Aston Martin Audi Bentley Bmw Brabus id 0 41 s t 5 65 m x 2 06 m y 1 96 m phi 62 23 Fok 21 50 km h vni 5 74 fok omega 4 77 rad s Je le EE K pt r Szerkeszt A 9 75 2 Figure 8 A Virtual Crash program Felhaszn l Dr MELEGH Gabor 1111 Bp Karinthy F ut 22 File Vehicle Dynamics UDS Impact Options Graphics 2 als ay 300 ms z ses 44 Junco Last Action 005 0 15054 Diagrams Options Graphics Print 4 8 3 233 D 7 ate 1200 DELI E 23 EJ 1200 LX t0 19 138 t1 19 982 dt 0 844 0 33 0 00 1 01 vy 0 00 sx 0 10 0 00 v 0 00 disz 0 01 7 a Figure 9 A PC Crash program Note The zero level should be adjusted when evaluating an XL Meter
55. ve the battery cover 3 4 Remove empty batteries 5 Insert new batteries according to the symbols 6 Put back battery cover and screw it on Note All batteries should be replaced at the same time Use AA type 1 5V top performance batteries Do not leave empty batteries in the instrument Important Do not use 1 2V rechargeable batteries as their nominal voltage 1 2V 4 4 8V is lower than the required 1 5V 4 6 0V Since charging always results in an overcharging voltage higher than the nominal the instrument will start to operate but with an extremely short operating time as rechargeable batteries soon reach their nominal voltage Note XL Meter also operates from a DC power adapter See section 4 2 2 4 5 PC connection XL Meter M can be connected to a PC via a standard RS 232 link cable supplied The interface is based on RS 232 protocol If a PC particularly Laptop or Notebook has no RS 232 serial port the solution can be the USB Cable Kit optional accessory The USB Cable Kit connects the serial port of the XL Meter Pro Gamma to the USB port of the computer The XL Vision M software establishes the communication with the XL Meter and uploads the measurement data from it Data upload is only allowed in Calibration Mode and in Display Mode at the end of the display cycle 4 6 XL Vision data upload and evaluation program XL Vision is a Microsoft Windows based data upload and evaluation program
56. will be available as a built in feature e Tram Brake Evaluation default For the moment it can be performed only in PC but in the future it will be available as a built in feature 4 3 5 1 Service Brake Evaluation XL Meter has a built in evaluation program to enable fast on the spot evaluation of service brake performance The built in evaluation program is valid for the automatic evaluation of braking performed by the service brake This built in evaluation program facilitates on the spot investigation of accidents creation of forensic engineering reports on accidents the task of service brakes testers etc As the built in service brake performance evaluation program starts automatically right after finishing a measurement Important After the vehicle has stopped and the vehicle reaches absolute standstill the user has to wait approximately one second before pushing the display button and terminating data acquisition XL Meter then automatically starts the evaluation procedure First it learns the standstill level that will be the base level for further calculations Note Pushing the display button earlier will result in an evaluation error see chapter 7 Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 13 XL Pro The brake start time and brake end time of the deceleration process is determined based on the measured characteristics The braking time Tbr is calculated by subtracti
57. y and turned on again by pressing the Red button yz x xI s rr n cx Inventure Automotive Electronics R amp D Inc XLMPUSREN73 page 19 XL Pro for approx 1 second Toggling the Buzzer in Measuring Mode is temporal only and has no effect on other sound signs Trigger Output The XL MeterTM Pro Gamma can be synchronized with other instruments with the help of the Trigger output There are three kinds of Trigger Output Start Stop Toggled or No output e Start Stop When starting a measurement the trigger output is changed from low level to high level from O to 1 At the end of measuring the trigger output is back to low level With this feature an other equipment can be started and stopped synchronously e Toggled The trigger sign is an alternate signal according to the measurement frequency Its periodical time is twice as much than the sampling time of the measurement Using this feature the XL Meter Pro Gamma and another equipment can sample synchronously e No output The level of the trigger output is low 0 4 3 6 2 5 Reset Defaults When selecting Reset Defaults in the Settings Mode menu all the setting parameters are restored to their factory default values The Default Settings or Factory Settings are the followings e Language English e Measuring Frequency 200 Hz e Measurement Axis Normal X longitudinal Y lateral acceleration e Measurement Range in X direction Base R
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