GPS05 Module
Contents
1. CHAPTER 6 USE GPS MANAGER SOFTWARE GPS05 MODULE 1 2 3 4 5 2 GPSMbneger 1 99 031 mE EE soho san E rat Deselect a Erase Selected Export Selected Import ru q No device connected 225 MotorSportRanch n Road America NU MountainHighwayRac REN New Castle Motorspo New Jersey Motor NJMP Lightning Oregon Raceway Park Pacific Raceways Pats Acres Portland Phoenix PKRA Phoenix Portland Int Racewa PortlandChicane 251 Prairie City 25 I PSGKA XE Pueblo Park HAS Putnam Park Road C ae RichlandTriCities 256 Road America me Road Atlanta ET Santa Maria k 258 5 Sebring Motorsports Spokane Raceway cae Spring Mountain 2 7 Aaa Streets of Willow RISE Summit Point EE Talladega SSpeedway feng Thunderhill Park J66 E Topeka 27 Filters in track data base management The list of the tracks that you have in your PC can be very long and is constantly updated by our technicians It can be useful to filter part of them in order to better manage the information We can have two different filters that we call Dynamic 2 or Static 1 Dynamic filters are fast to use give an immediate feedback and are not saved when you close the software Static filters are used when you have to de fine the geographical environment the c2. Made in Italy AiM Srl Via Cavalcanti 8 20063 Cernusco S N MI Italia Tel 39 02 9290571 Fax 39 02 92118024 www aim sportline com GPSO5 Module USER GUIDE 04 06 08 10 14 16 26 36 42 54 02 GPSO05 Module INTRODUCTION GPS05 CONFIGURATION CONNECTION TO AIM LOGGERS GPS05 AND MXL GPS05 AND EVO3 ECU BRIDGE GPS05 AND MYCHRON 4 USE GPS MANAGER SOFTWARE USE RACESTUDIO2 ANALYSIS SOFTWARE TEST ON THETRACK WITH MXLPRO DATA SHEET Thank you For choosing to purchase our GPS05 Module GPS05 Module is the result of many hours of research development and consultation with high level racing teams around the world We wanted GPS05 Module not only to be small but also to be the most precise po werful and reliable GPS receiver available for the world market in Motor Racing today The simple installation and management are features that are inherent in Aim GPSO5 Module GPS05 Module will be your partner on the track 727 03 INTRODUCTION What is GPSO5 Module GPSO5 is a GPS receiver module that can communicate with a display data logger through the CAN connection The GPSO5 is able to store a maximum of 50 tracks used to calculate lap and split times The data that is stored for each track e Track name e Track type e Lap beacon position e Possible split position The data is used to Identify the track e Calculate travel times e C
3. a M eM m Daytona Oval 281 speedway EA Adams Motors Pak Autobahn CountryClu Barber Motorsp Par Belle Claire identical in PC list Bettercowtown Boyds Speedway Brainerd Raceway Buttonwillow Kart Buttonwillow Rway California S Kart California Speedway Carolina Motors Par Central MS Speedway Chuckwalla Lola Clarksville Speedwa Clay Co Fairground Clayhill Motorsport 33 EEIT Tsukuba Car italia PESE FE Ala di Trento IFFE Branduzzo FJ Branduzzo Moto FES Busca MEE Cervia wim Corridonia i27 v Franciacorta PESI Gordona Fea Imola EIUS v Imola Auto In order to transmit data to GPS05 Select the tracks to transmit by clicking on the left square or double clicking on the track name Move the track toward the right panel or push the Arrow 1 The track information are moved toward GPS05 Fa n P P s Te F Lo E i At f fit l n A k m Q CHAPTER 6 3 tracks selectec 3 3 CODEN In order to receive data from GPSO5 Select the tracks to receive by clicking on the left square or double clicking on the track name Move the toward the left panel or push the Arrow 2 The track information are moved toward the PC database USE GPS MANAGER SOFTWARE To delete Tracks data from GPS05 To delete data from GPSO5 simply select the track s in the right panel and pus
4. ll Bad Setting please Restart B GPS OFF the configuration procedure did not succeed and should be repeated Press VIEW and repeat the procedure If the display shows If the display shows ll GPS LapTimer Initializing E GPS FW must be Upgraded GPS Lap Timer is starting just wait for a few moments for it to update If the display shows ll GPS Tracks Memory Full There is already data for 50 tracks stored Use GPS Manager software to delete less important data 24 The GPS firmware needs to be upgraded The GPS firmware needs to be upgraded GPS05 MODULE 25 Use GPS Manager software GPSManager is the software that allows you to update modify read and write on your GPSO05 lap and split beacons of the track you are going to race on GPSManager when ther is no logger connected to your PC shows the image you can see here On your left you have the list of the tracks in your PC organized depending upon the country in which they are Track shape when available and information about the typology of the track for kart cars bikes are also shown On your right you have the image of the track in which you have the mouse Track management command Selection window for dynamic filters Track type car bike karts Track data manager Track shape with starting line and split points position Small track shape Track selection Open Close Country track data 0O50 ooooSgo
5. section of Aim RaceStudio2 software to update these parameters ll Speed Your logger can get speed information from the ECU from wheel sensors or from GPS Please select GPS Speed 1 if you wish to use this one as reference speed that is o Channel Speed 1 v Lap Show lap time C Show odometer Show running lap time 00009 C Condition enabling checked alarms Channel 2 a gt I Channel 6 v B Field 2 Tiens displayed Obscuring time 8 zT ls Lap segments 1 Lar Car Bike Channel 4 1 0 off to say as information for compute the pre dictive lap time the distance from the star ting point and as speed shown on the display ll Lap times calculated from GPS position MXL can calculate lap time from an optical receiver or using the GPS signal In this last case track width must also be selected 2 1 O Use GPS Lap Timer Track width For GPS Lap Timer precision Specific Channel For alarm Threshold ure Short name Enable static string Channel 2 g Hz Field 4 page 1 p f t Channel 4 v CH 4 GPS05 AND MXL Configuring the lap beacon through MXL To update lap and split beacon on GPSO5 Module follow this procedure e Ensure that the GPS Module is correctly connected to MXL Press MENU on MXL keyboard e The system shows a menu
6. 10 02 007 9 pk 45 618933 9 284668 Lat Lon 45 619956 9 281428 31 How to modify track data in the PC database Click on the pushbutton 4 that appears at the side of the track shape icon the following window will appear Please modify data in accordance to your necessities Track Information and Properties Lat Lon 45 619956 9251428 CHAPTER 6 45 61995 7 3 281428 m 32 USE GPS MANAGER SOFTWARE GPS05 MODULE How to read write and delete tracks form GPSO5 Please connect your system composed by a Master Unit MXL EVO3 MyChron 4 with Data Key Smartycam and GPS05 to your PC through USB connection GPS Manager will automatically show you on the right side of the display the list of the tracks inside GPSO5 4 GPSManager 20102 fe Optom As you can notice the information available are a subset of what you have in the PC database only the track name and coordina tes The track shape is transmitted only to SmartyCam Select Al RE Bettercowtown Boyds Speedway Ek EE Brainerd Raceway Buttonwillow Kart Buttonwillow Rway Li California S Kart California Speedway Carolina Motors Par Central MS Speedway Chuckwalla Lola Clarksville Speedwa Clay Co Fairground Clayhill Motorsport Columbus Speedway Corinth Speedway Cottage Grove Cowtown Cowtown Speedway Daytona
7. Pacc Precision Accuracy gives the precision cor related with the calculated position of the vehicle Itis considered good when is about 2 mt USE RACE STUDIO ANALISI SOFTWARE RS7Analtysis 7 47 06 Profile Utente New User Profile 3 Gps Eseta lt Bi GPS05 MODULE 37 CHAPTER 7 USE RACE STUDIO ANALISI SOFTWARE GPS05 MODULE In the picture you can see four different tra You can zoom the image in order to have a You can also export the track drawing into jectories in the same point of the track in good resolution a kml file in order to see it in overlay in different colours in dependence upon the Google Earth speed of the vehicle 38 39 CHAPTER 7 USE RACE STUDIO ANALISI SOFTWARE GPS05 MODULE M This view appears How to use GPSO5 data to calculate lap times a E after the test On the right is your test with no laps B Cursor position on the track If the system is not correctly configured a To re calculate lap times On the left are four possible division criteria test session can miss the correct lap times based on the lap coordinates a Select GPS Lap Insert in Lap Manager Manually filled in coordinates Each lap time can be calculated assuming view These coordinates can come from of course that GPS data is correct a Another test performed on the same track In this case the source test name is needed B Test database and Lap manager v Set Lap Beacon for Test AIM YamahaR 7 Se
8. that support GPSO5 do not need a special configuration they automatically recognise the GPS Module and start sampling and storing GPS data However in case you want to show on your display the GPS speed or to use the coordinates for lap time the system will need specific information Below shows how to configure different Aim devices Dash Logger GPS05 08 CONNECTION TO AIM LOGGERS GPSO5 Data Logger GPS05 MODULE Display 09 CHAPTER 3 GPSO5 AND MXL GPS05 MODULE GPSO5 connected to MXL You can connect GPSO5 to all MXL models Pro Pista and Strada Please note that the firmware has to be at least 14 86 47 ll Connection to MXL Pista and Strada The connection is direct simply use the 5 pin connector in the back of the dash Direct connection connector lll Connection to MXL Pro05 In order to connect GPSO5 to MXLpro please use the proper CAN connector that you find in the harness Pressing lt lt e you can view the satellite signal status On the bottom of the display it will show Number of connected satellites Satellite status Available options are Search Searching for satellites signal Weak GPS signal is weak Good Signal reception is ok Buttons N Sat Status Sat 10 11 CHAPTER 3 How to configure MXL when connected to GPSO5 The MXL needs information about speed and lap time to manage GPSO5 Use the System Configuration
9. values 42 But a brief explanation is required let s take for example the lateral accelera tion value as shown in the diagram below Let s identify with A the GPS LatAcc vec tor module calculated through GPS an tenna trajectory We ll call B the Lateral Acceleration vector module obtained by on board lateral accelerometer values With a neutral car not affected by understeering or oversteering condition and with constant speed and cornering radius A and B vectors are equal TEST ON THE TRACK WITH MXLPRO on the other side on oversteering vehicle the value of the projection on the normal Lateral acceleration vector trajectory calcu lated through the on board lateral accele rometer identified as B is lower than the GPS calculated one DIRECTION B is also affected by the Longitudinal acce leration vector projection C on the nor mal trajectory as shown in the picture below With vehicle completely deviated compa red to normal trajectory the result value would be a B Lateral Acceleration equal to zero GPS05 MODULE Similarly in case of understeering we ob tain a C related longitudinal acceleration component called C due to its projection on the normal trajectory that adds itself vectoriarly to the normal lateral accelara tion related to B trajectory kc DIFLECCE TIONS fub Now let s identify a simple match channel called Diff LatAcc by using the formula Diff L
10. with backlight or GPS options Select Set GPS beacon using gt gt lt lt buttons Press OK The MXL will then prompt to fix the lap bea con Go to selected start finish line and press OK Lap beacon is now saved Once the lap beacon is saved if the system is required to sample split times the follo wing page will appear go to the selected split point and press OK When configuration is over the system shows the main page and sampling can now be done GOOD TRK circled here below confirms that the system has recognised the track and is ready to sample lap and split times To cancel the procedure switch off on MXL E WARNING in case of weak satellite signal the sy stem can ask for the procedure to be re peated It is strongly recommended not to fix lap split times under bridges or near any large obstacles GPS05 MODULE CHAPTER 4 GPSO5 with EVO3 or ECU Bridge Use RaceStudio2 to configure EVO3 or ECU use the System Configuration section of Bridge Aim RaceStudio2 software to fix these Your system needs information about points speed 1 and lap time 2 to manage GPSO5 14 GPSO05 AND EVO3 ECU BRIDGE Current configuration installation name Data logger type Ecu DEF AULT EVO3 PRO MOTEC M8XX N AIM sensor ll Speed Your logger can get speed information from the ECU from wheel sensors or from GPS Please select GPS Speed if you wish to use t
11. 1 17 893 0 10 This behaviour is less noticeable in corners A and B Please note the change between oversteering and understeering in corners B E and G 47 CHAPTER 8 TEST ON THE TRACK WITH MXLPRO GPS05 MODULE This is evidenced through the analysis of Now let s analyze a specific part of the Diff Gyro Abs channel also track Diff acc abs lap 18 01 17 8383 0 13 0 35 Diffgyroabs lap 19 01 17 893 _ 1 38 10 00 0 26 0 09 DIRECTION 15 00 Also in this case oversteering condition is It s clearly evedenced how the vehicle evidenced in blue while the understeering reaches point D while braking after the condition is evidenced in red straight line and understeer before entering the left corner in oversteering condition 48 49 CHAPTER 8 TEST ON THE TRACK WITH MXLPRO GPS05 MODULE This is also evidenced by Diff Gyro Abs By analyzing driver s behaviour in this corner we can notice that the car is neutral because of channel driver applying brake and throttle at the same time 100 00 ae p e 75 00 lap 19 01 17 693 2 36 EE gyro abs frenata but it becomes undesteering in throttle opening phase as evidenced The steer channel viewed at D point shows that the driver had to strongly deal with the steering wheel to keep the vehicle in the best trajectory 50 51 CHAPTER 8 TEST ON THE TRACK WITH MXLPRO The strong oversteering behaviour at the entrance of the co
12. alculate split times Which circuit types are managed Closed circuits or point to point races like uphill races or rallies The data supplied from GPSO5 GPSO5 calculates 10 times in a second the following information Position latitude longitude altitude e Speed e Longitudinal acceleration e Latitudinal acceleration Also it supplies information concerning e Lap times Split times e Test duration This information is continuously tran smitted to the logger via the CAN con nection If the GPSO5 library does not include the track It can be easily added as explained in this user manual 05 How to configure GPS05 Module The GPSO5 needs to be configured to iden tify the lap beacon position to record lap times Calculate You can choose the lap beacon position in two ways ll Using AIM software GPS Manager Using GPS Manager software and transmit ting the information about the tracks to the GPS05 GPSO5 will automatically recognise the track at power on and will use the lap and split positions and other important points for the calculations CHAPTER 1 ll Directly on the track Setting the position of the lap beacon di rectly from the track while driving on the circuit This can be done only if GPSO5 is connected to one of our Aim loggers GPS0O5 MODULE CONFIGURATION GPS05 MODULE CHAPTER 2 Ho to connect GPSO5 to Aim loggers Aim Loggers
13. atAcc GPS LatAcc LatAcc 43 We can extend this reasoning also to the gyro This is because the GPS_gyro channel in dicates the vehicle s yawrate as tangent of covered trajectory while the gyroscope sensor measures vehicle s cornering Let s create a second math channel called Diff_gyro defined by the formula Diff gyro GPS gyro Gyro At this point we can say that Diff gyro 0 understeer Diff gyro lt 0 oversteer Diff LatAcc 0 oversteer Diff LatAcc lt 0 understeer But further explanation is needed 44 CHAPTER 8 Let s take for example gyro e GPS gyro channels values If the vehicle is in a oversteering condition inertial sensor value will be more than gps gyro because the vehicle would had a wider yaw angle than trajectory related one Let s mark right curves as positive and left corners are as negative For all right corners in oversteering condi tion we obtain gyro GPS gyro In case of left corners with parity between cornering range and yaw angle with over steering vehicle we ll obtain GPS gyro gt gyro So the channel Diff_gyro GPS_gyro gyro To obtain the same oversteering indication the parameters have to be inverted and de fined as Diff_gyro gyro GPS_gyro TEST ON THE TRACK WITH MXLPRO To define these conditions it is necessary to use absolute values Diff_Gyro Abs abs GPS_Gyro abs gyro This way the absolute value
14. e MyChron4 informs the user that more tracks are available in a 5 km radius Press gt gt and the list of available tracks appears The desired track can be manually selected by pressing OK If no choice is made the logger selects a track according to the situation W In case there are two physically diffe rent tracks just run a complete track lap to let GPS detect the track sampled data can be considered reliable from the second complete track lap Bl In case there are two or more settings of the same track the GPSO5 Module selects the last one stored At the end of the session you can check the selection your GPSO5 made for you just by entering available tracks page press gt gt 21 CHAPTER 5 GPS05 AND MYCHRON4 GPS05 MODULE What MyChron4 displays during the race Pressing VIEW MyChron4 display shows By pressing VIEW again the GPS signal GPS speed with the related unit of measure level appears and will show kmh mph under the RPM graph bar E Number of connected satellites ll Status GPS Possible options Search searching for GPS signal Bad bad reception Weak weakreception Good good reception E GPS Speed GPS SIGNAL STATUS NUMBER OF CONNECTED GPS SPEEO SATELLITES amp GPS SPEED AVAILABLE OPTIONS ARE SEARCH BAO WERK GOOD 22 23 CHAPTER 5 GPS05 AND MYCHRON4 Troubleshooting If the display shows If the display shows
15. h Erase Selected To change track name in GPSO5 If you wish to change the name of the track in GPSO5 without or before moving it to your PC for example when you have got the beacon position directly on your system simply double click on the name of the track change the name and close the panel GPS05 will be automatically upgraded GPS05 MODULE Erase Selected Track name Insert a new track name L 45 387492 9 172769 45 387162 9 173540 45 386899 9 173092 45 387043 9 172077 45 387244 9 172134 35 CHAPTER 7 Data Analysis using GPSO5 information After the test you can download your data to the PC for a deep analysis thank to the professional software Aim RaceStudio Analysis Please select View gt gt GPS Data for loo king at the trajectory of the vehicle during its test The data obtained by GPS are GPS Speed Speed obtained from GPS signals GPS Nsat Number of satellites seen by the GPS recei ver In order to have a good quality signal the receiver is supposed to see at least 7 sa tellites GPS LatAcc lateral acceleration toward the direction of the movement GPS LonAcc Longitude acceleration in the direction of the movement 36 GPS Slope slope of the movement GPS Heading direction of the vehicle in degrees 180 toward the North GPS Gyro vehicle yaw in degrees sec GPS
16. his one as reference speed that is to say as information for compute the predic tive lap time the distance from the starting point and as speed shown on the display 1 GPS05 MODULE Lap Timer Vehicle name Available time Time with GPS Total freq DEFAULT 4 49 23 hms 3 37 098 hums 481 Hz Calculated gears are available only when showing gear display is selected lll Lap times coming from the GPS position EVO3 can calculate lap times using an optical signal or a GPS signal In this last case GPSO5 is to be enabled so that it can provide the information and the track width is to be defined as well 2 15 CHAPTER 5 GPSO5 with MyChron4 The easiest way to connect GPS05 to MyChron4 is a straight connection through the 5 pin EXP expansion connector on the back of the MyChron4 MYr LI DAMNA Connector for a direct connection 16 GPS05 AND MYCHRON4 GPS05 MODULE If you wish to build a network with more peripherals use a Data Hub Expansion Module as shown here below To externally power the network refer to the scheme here below e0000 Four ways Data Hub 17 CHAPTER 5 GPS05 AND MYCHRON4 GPSO5 MODULE MyChron4 at the power on Configuring the lap beacon from MyChron4 At power on the logger shows firmware Once the MyChron4 is connected to GPSO5 versions of all the items of the network as and switched on press On View until below page G P S Data a
17. k closed track Oval point to point type of surface asphalt dirt ice water Finally please select the type of vehicle that generally runs in the circuit Car Bike or Kart If you have already produced a test file with GPS data GPK file that you get downloa ding data from your logger using Aim software RaceStudio2 you can define the track shape pushing the pushbutton Load Shape 30 xport Selected i Track Information and Properties Track Information and Properties USE GPS MANAGER SOFTWARE It is now possible to select the file GPK containing the coordinates of all the points of your test The shape of the track appears splitted in different laps of the test It is possible to scroll through the different laps to zoom to rotate the drawing After having selected the desired lap push OK for saving the image of that lap That image will be used as a reference shape for the future Finish line coordinates are read from the GPPK file but can be modified as desired in one of the following ways Define the coordinate by hand 1 Position the cursor on the desider point of the track and click the pushbutton Cursor Pos 2 In case of a Point to Point track it is obviou sly useful to define the coordinates of the starting and finish line Push OK for saving the configuration GPS05 MODULE Cercai CI TRACK Iib rum pore mer c PLOCI CASTELLETTO 2005
18. ll GPS yaw rate ll Satellite number GPS05 MODULE Our web site aim sportline com is constantly updated We try to share with you our experiences about our products and how to use them in the tracks all over the world Please constantly check it and download the last versions of the firmware of your products eura 55
19. ountry in which you normally use your GPS and are saved also when you close the program Static filters are activated by pushing pushbutton Filter 1 you can select countries type of vehicle and type of track that you wish using the window here shown Please notice that the lists whow countries vehicles and type of circuits that appear at least once in your database if for example you delete all the tracks in Germany this country will not appear in the list 28 CHAPTER 6 _Recelved From Logger Australia Austria Belgium Canada Croatia Czech Republic Czechoslovakia France Germany Holland Hungary dn Japan Malaysia Netherlands Portugal USE GPS MANAGER SOFTWARE Dynamic filters remain active only till when you close GPS Manager You can use this filter introducing the name of a particular country and vehicle in the small window at the top left of the page If for example you write KART US you will see only the kart tracks in the United States Adams Motors Pak GPS05 MODULE California S Kart McMinnville Oregon Michiana Raceway Miller Kart Track 29 CHAPTER 6 How to add a new track to the PC database To add a track to your track list proceed this Way 1 Press New 2 Please insert the track name in the window 3 Please fill the fields country type of trac
20. ppears MyChron4 eBox Gold This page will allow you to check if the and GPS05 Module firmware versions GPS05 is working correctly and if it is receiving satellite signals Itis also possible to fix lap beacon through the keyboard just cross the start finish line and press OK MYCHRONG FIRMWARE EBOX GOLD TER mer n VERSION FIRMWARE RU WSS NUMBER S senis eo VERSION OF CONNECTED gt x s SATELLITES E STATUS GPSOS FIRMWARE VERSION MYCHRONG VERSION EVROPE USA MYCHRONG SERIAL NUMBER 18 19 ll WARNING To use GPSO5 for lap times calculation just set Lap type in MyChron4 configu ration When selecting GPS Lap timer this lap timing mode becomes the default When selecting optical magnetic this lap timing mode becomes the default If GPS Lap Timer is enabled in the MyChron4 menu and the GPSO5 is discon nected then the lap times calculations are switched automatically to optical magnetic receiver mode 20 GPS05 AND MYCHRON4 GPS05 MODULE Selecting the track from MyChron4 GPSO5 can store up to 50 track configurations with a maximum of 5 splits for each track The track is automatically recognised within a 5 km radius The message Track Ok shown central on the display means that the track has been recognised and the system can sample lap and if required to split times If GPS05 Module detects more than one track in a 5 km radius MyChron4 display shows this pag
21. rner and the understeer while exi ting was caused by the wreck of front left shock absorber Vel Histogram sosp ant sx 160 0 1 MBE THROTANG J Il Wi INN il ll 1620 1640 1560 1680 1700 1720 1740 1760 1780 X 1800 1820 1840 1850 1880 1300 1320 1340 This shock failure caused the vehicle to loose grip Note how the rear right shock B suffers mainly this condition With parity of compression and extension settings at high and low speeds compared to rear left the rear right can t absorb the tyre shaking 52 GPS05 MODULE As clearly shown in shock speed histogram the A shock loss completely efficiency causing the shock itself to work without any absorbtion Vel Histogram sosp ant dx While reading shock speed histograms don t forget that X Axis is automatically software scaled The diagram low scale for the rear left shock is 2596 while is 2096 for the rear right With scale parity the rear right diagram should be compressed 53 GPS05 Module 54 CHAPTER 09 GPSO5 DATA SHEET ll Vehicle position W Track map E CAN output all parameters W No calibration required ll Cable length 2 mt Bl Nylon box lil Colour black ll Dimension mm 64 x 53 x 20 ll Weight 60 5 g B 6 Channel ll GPS speed W Lateral acceleration Bl Linear acceleration W GPS heading
22. t Lap Beacon Position reading it from GPS Track Database LATITUDE 44 344493 LONGITUDE 11 714373 4 Thu Jan 11 2007 17 27 21 Frstlap 100 22 02 36 0836 Lap marker 01 58 214 Reference 4 34 506 Lap marker 4 02 45 6365 06 32 720 Vehicle stop C Use currenk Cursor position Q Set Manually Latitud Longit O Set Lap Beacon Position reading it from the test Select the option you prefer at the end of this setting lap times are easily re calculated 40 41 Mxl Pro CHAPTER 8 Oversteering and understeering analysis To hold this test we have been using the following sensors GPS 4 shock potentiometers Steering angle potentiometer Front and rear brake pressure potentiometer Longitudinal accelerometer Lateral accelerometer Gyro 4 speed sensors All channels acquired from MBE 992 ECU connected in CAN line Analysis One of the troubles reported in on track data analysis is to understand with a good approximation the behaviour of the vehi cle when the driver pulls it to the limit especially in understeering and overstee ring situations We remind you that oversteering is caused by loss of grip of the rear axle opposite steering is needed while understeering is caused by loss of heading of the steering axle the car s trend is to go straight A valuable instrument for analysing the ve hicle reaction is comparing GPS values and on board dedicated sensor
23. will be consi dered no matter what their sign is The difference channel obtained through absolut gyroscope values will be named as Diff_Gyro Abs In the meanwhile we have to create the Diff LatAcc Abs channel The correct syntactic string to be inserted as math channel in RaceStudio 2 software is Diff LatAcc Abs abs GPS LatAcc abs Acc_1 Once the channels have been defined the behaviour of the vehicle can be summarized in this way GPS05 MODULE Diff_gyrocond gt 0 understeer Diff_gyro cond lt 0 oversteer Diff_LatAcc 0 understeer Diff LatAcc lt 0 oversteer 45 Now let s analyze these two math channels values distance base Diff acc abs 0 00 1 80 4 4 Diff gyro abs 0 00 600 800 1000 1200 1400 1600 We can immediately observe that both channels Black Diff_gyro Abs Red Diff LatAcc abs Are in phase giving us a double check of what said before 46 CHAPTER 8 time 34 820 dist 1333 2 2000 2200 TEST ON THE TRACK WITH MXLPRO GPS05 MODULE Thanks to GPS trajectories software viewer it is possible to obtain a chromatic scale of Diff gyro Abs and Diff LatAcc Abs values with related variation on the track map Diff acc abs As said before blue zones indicate oversteer while red ones are understeer It s easy to verify how the vehicle overstee red while entering some corners marked as C D E F G blue points lap 19 0
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