User manual
Contents
1. YACC User Manual Page 8 of 17 pott EU E aqo E Eme ee E C EC CL ids IM ic Ll i dL Kudos a ere PC ADM MCA LM Md MM Poe ee oe Met aes ME 1 3 Signal forming optional 0 uc ic RESET SCK PB5 19 Power supply AZD input J J 18 1 1 Li I MISO PB4 717 Fg rt 1 10 MOSI PB3 16 Yi I C6 33 _ 01 SS PB2 5 Ea x Fg 1 1 M 12V bog E12 MHzg OC1 PB1 14 I Fg ICP PBO ICP END CTAN Li CT co 1 cys 21 I R2 Ti LA C7 33 ADC5 PC5 SCL N PWR4 BC557 3 3V I tocapo SDA i Ac p sem he 11 ADGS PCS 2 una E R3 ms E 22 ADC2 PC2 a LM224N E CS 2290 be 24 ANT 3 3V 22k 7 E ADCO PCO ADCO IC5LP2950 3V3 mut Bw I Fo ARI 1 GND v AIN1 PD7 12 Fg our INLL 3 Q 3 3 3V AINO PD6 n 15 Al GND 5 3 Fg 5 I T1 PD5 X 1 Q a Az GND x 0 4 e RADIO ST T i I T cox alt bag INT1 PD3 5 TN4148 D4 R19 INTO PD2 5 2 S 1 I 1 1N4148 405 X 2 PwR1 E i Ld ATMEGA168 p GND pg I PE a2. Construction Schematic diagrams are shown on fig ures 10 and The microcontroller running with clock 12 MHz and supplied with 3 3 V is the main ele ment At such supply voltage the mi crocontroller is slightly overclocked but works correctly Low supply voltage guarantees proper work of device when ignition is attempted what usually cause big battery voltage drops Supply Supply circuit uses low drop voltage regulator IC5 Key on voltage pulls PWR2 line low which in turn switches transistor on and powers the micro controller Microcontroller keeps PWR4 line low during work and keeps power even after turning key off Concur rently YACC monitors key on voltage by reading state of PWRI line A D converter A D converter input voltage range is O 1 1 V Battery voltage measurement uses a divider with R4 and R5 resistors Diodes D1 and D2 protect A D input Outputs IC2 and T2 are used to convert 3 3 V level signals into 12 V level ones If you don t intent to manually con trol automatic antenna than skip assembly of T2 R13 and R16 ele ments Inputs IC3 is used to convert 12 V level sig nals into 3 3 V level ones Additionally for traveled distance signal ICP engine revolution signal INT1 and fuel con sumption signal INTO Schmidt triggers built with IC4 can be used Triggers are activated by jumpers according to the following table Schmidt tri
3. 1 3 108 37 38 39 40 41 42 43 44 45 Figure 9 Calculation of fuel consumption calibration coefficient by fitting a straight line y cruel to recorded data with least square method Gnuplot program was used YACC User Manual Page 17 of 17 LCD 2x16 RESET SCK PB5 MISO PB4 MOSI PB3 SS PB2 OC1 PB1 ICP PBO ADC5 PC5 ADC4 PC4 ADC3 PC3 ADC2 PC2 ADC1 PC1 ADCO PCO AIN1 PD7 AINO PD6 T1 PD5 TO PD4 INT1 PD3 INTO PD2 TXD PD1 RXD PDO ATMEGA168 Figure 10 Connection of LCD display
4. DISTANCE i SPEED COEF modes Measurement time is determined by two values the minimum time SPEED T MIN and maximum time SPEED T MAX One can apply own values to these coefficients to achieve the best fit to own car The measurement in cludes the lowest number k impulses not greater than 255 such that tp x tn gt SPEED T MIN For big speeds the measurement could last shorter than SPEED T MIN When at least two im pulses will not be recorded during SPEED T MAX time instantaneous speed is assumed to 0 and a new measurement starts immediately When the value of coefficient SPEED NOISE 0 and the number of recorded impulses k gt 2 5 NOISE only k beginning impulses consid ered in the calculation where k k is the biggest multiple of SPEED NOISE Engine revolution speed Measurement of engine revolution speed is analogous to measurement of instantaneous speed The RPM value is calculated with the following formula min Selection of the value from set 1 2 3 4 5 6 3 1 RPM COEF mode allows to fit to own car Minimum and maximum times of measurement are determined by RPM T MIN and RPM T MAX configuration settings Measurement includes no more than k 255 impulses can last shorter than RPM T MIN for big rev olution speeds 46 875 60 tntk tn k Fuel mileage Fuel consumption is calcu
5. BATT 12 2 YACC switches to this mode immedi ately after key is turned on giving pos sibility to observe voltage drops when vehicle ignition is attempted After 20 seconds YACC returns automatically to basic mode Trips Trips allows to measure total distance time and used fuel for longer periods Long press in TRIPS mode switches to trips related menu where short presses cycle through suc cessive trips TRIP 1 TRIP 2 TRIP 3 and command EXIT returning to main menu automatically after 5 seconds or with a long press For each trips following values are displayed every 2 seconds a trip number e g TRIP 1 b traveled distance c average speed d time of trip e average fuel consumption f total fuel consumption g fuel cost Symbol after number means that trip is active distance time and fuel data are updated all the time Lack of means that trip was ended Long press begins or ends the trip If the trip is inactive the command BEGIN n is shown where n corresponds to trip number Next long press resets all trip related data and marks trip as active The action is confirmed with DONE Since that moment distance time and fuel data will be updated all the time If the trip is active the command END n YACC User Manual Page 3 of 17 is shown Next long press ends the trip The action is confirmed with DONE YACC switches to BATT mode for 20 sec onds immediately after k
6. Configuration modes YACC User Manual Page 14 of 17 y Suwa _1234 1 SSS Y 1234 2 4 W Y Y Y Y Y _ 234 3 4 5 6 a Y 4 5 7 Short presses cycle through digits and ER commands SET CANCEL Selected digit EE oa is marked with etj Long presses switch to digit value change mode execute commands pone 6 7 9 a M gt EE ES Short presses select new digit value EXE Long press confirms a choice Y Y 8 9 Y Y 9 0 0 Figure 7 Editor mode Initial value 1234 is changed to 50 YACC User Manual Page 15 of 17 v 5 Speed calculated 80 P from two neighboring points Average speed Cnoise 15 70 144 i 60 15 2 1 gt t s 1224 00 1224 05 1224 10 1224 15 1224 20 Figure 8 Inaccuracy of instantaneous speed measurement Pulser is place in mechanical speedometer YACC User Manual Page 16 of 17 File fuel dat with data for gnuplot program Gnuplot commands uf 8 1 9 10 Results with thick cluded from calcu lations 1 8 105 1 7 108 y 3 669 000 z 1 6 108 1 5 108 1 4 108
7. SPEED COEF In editor mode enter Caist Value in range 1 65 535 equal to number of impulses corresponding to 1 km Instantanous speed averaging SPEED NOISE YACC uses a simple al gorithm to achieve better precision of speed measurement The measure ment process lasts approximately SPEED T MIN Number of recorded impulses correspoding to traveled distance is di vided by measurement time Traveled distance impulses are gen erated by special devices called pulsers Construction of pulsers varies Very of ten they are based on rotating wheel Mechanical inaccuracies of workman ship looseness axis and propel cable vibrations can cause additional errors Figure 8 shows calculations of instan taneous speed based on recorded times of two successive impulses Result analysis indicates that for this specific case pulser generates 15 impulses with every revolution There fore it would be better to use time pe riods corresponding to multiply of 15 impulses In editor mode enter the value SPEED NOISE in range O 99 Value 0 turns averaging off If during single mea surement less than 2 SPEED NOISE impulses are recorded small speeds than instantaneous speed is calculated without averaging For other cases the biggest multiply of SPEED NOISE im pulses is used in calculations Signal selection SPEED SOURCE The letter corre sponds to rising edge and the letter F to falling one Long press
8. fica 059 de aa C5 C7 D2 D1 e S 2 BIN 1 z amp lc oc 2 Ti l to x L 9 T ET C6 D3 Made in Poland We 22 Q1 o Ri 220 D1 D5 14148 es ee Tl T2 BC557B R4 82 KQ C2 C4 47 uF 168 IC2 IC3 ULN2003 R5 5 6 KQ C5 C8 220 nF R6 Rll R14 R15 R20 R22 R24 47 C6 C7 33pF IC4 LM224 LM324 IC5 LP2950 3V3 78L05 R12 10 91 12 MHz R19 R21 R23 100 KQ YACC User Manual Page 10 of 17 Display connection type description Corsa B Corsa C Vectra B Astra F Astra 2 supply Key on voltage 12 V 5 1 5 3 output MRQ 10 12 10 4 supply Ground 3 6 2 5 output SDA 11 11 11 6 input Traveled distance signal 12 9 12 7 output SCL 9 10 9 8 output Controlling signal 12 V 8 2 8 11 input Control button On circuit board 13 supply Battery 12 V 1 3 1 Automatic antenna connection type description l output Connection with automatic antenna fig 4 pin 7 10 input Connection with radio receiver fig 4 pin 7 Engine revolution and fuel consumption signal connection type description 12 input Fuel consumption Signal from Engine Control Module or from injector 14 input Engine revolution speed Signal from Engine Control Module Table 1 YACC connector description YACC User Manual Page
9. Ee ysl ee ee Aa 1 l 1 1 I I Fg 1 1 LM224N 1 1 Inputs s cid 5 ue 2 2 ari er a Y L OOOO r E E eo i Outputs Fg z t L1 a 2 R22 mi I E oooo 11 I 12V I 47k pog o I 1 l z 1 2 r3 BC557 t I I 1 I p R6 R7 T i R8 R9 1 I EM x x x l R24 pog c un I a R10 RU 14 19 47k PWR1 Oo H eae 4M Bo 14 PWR2 12 1 O1 n SCL 1 LM224N 1 PWR4 O3 3 PWR3 10 a o2 12 11 INTO O4 H I i i 03 13 spa pau INTI 05 15 L 3 04 14 RADIO O6 16 5 15 11 ICP 07 17 Loi R16 O6 16 ANT Lu l CD GND LT 07 17 E R6 R11 47k a Dok CDEIBND L 1 IC3 5 I pag ULN2003AN GND 2 I ra ULN2003AN GND TT l RE u Seapets he as I Figure 1 Schematic diagram Control button switches the ground YACC User Manual Page 9 of 17 Figure 2 Placement of elements YACC IC3 1 2 R15 gt Rev 1 R14 EEN R13 Ha
10. changes be tween R and F YACC User Manual Page 4 of 17 Minimum measurement time SPEED T MIN In editor mode enter value in range 10 110 in hundred parts of second Maximum measurement time SPEED T MAX In editor mode enter value in range 10 110 in hundred parts of second Fuel Tank capacity FUEL TANK CAP In editor mode enter tank capacity value in range 0 250 in liters Value O turns low fuel level warning off Warning level FUEL WARN LEV In editor mode enter value in liters in range 0 99 Value 0 turns low fuel level warning off Currency symbol FUEL CURRENCY In editor mode enter three letter currency symbol e g EUR USD etc Accuracy FUEL ACC Long press switches be tween displaying numerical values re lated to consumed fuel averages FA FH FK FX fuel counter F with accuracy of one or two decimal digits after dec imal dot One should remember how ever that TID allows to display deci mal point between two most right dig its only With two digit accuracy result will be shown as integer with unit 0 01 1 100 km Calibration coefficient FUEL COEF In editor mode enter value in range 1 99 999 999 equal to the sum of impulses lengths corre sponding to 1 liter of fuel Reading fuel consumption data FUEL HISTORY In this mode one can read data necessary to compute fuel consumption calibration coeffi cient Shor
11. cost of fuel for longer periods of time 9 Tachometer 10 Battery voltage meter 11 Manual steering of automatic an tenna It is possible not to use the antenna e g when listening to CD 12 Sport mode 1 4 mile and 0 60 0 80 0 100 km h runs Informations from points 2 3 4 and 5 are automatically displayed when ve hicle stops While going through the city they give an interesting possibil ity of observations of mileage compar ison the average speed with the speed of e g bicycle realizing how much time we spent in traffic jams and how big car expenses are Instantaneous speed gives a chance to estimate how big an excess of factory speedometer indication is Average fuel consumption corre sponding to segment of the road fo cuses our attention on big differences depending on traffic conditions and driving style Using the YACC Single button is used to control the de vice Two types of presses are recog nized Pressing and holding the but ton for less than 1 second is called a short press Pressing and holding the button for more than 1 second is called a long press Short presses cycle the display between successive working modes Long presses are used to enter commands e g to reset fuel counter to begin a trip etc A symbol is shown when a long press is available Working modes are shown on figures 5 6 and 7 Short presses are repre sented by thin vertical lines SPD M A T a
12. press changes value to op posit one When manual steering is disabled antenna opens automatically with ra dio turning on and closes 10 second af ter turning radio off Connection with factory radio re ceiver RADIO OPEL Value YES allows to use factory radio receiver When receiver is in use YACC does not send any data to TID Value NO corresponds to constant access of YACC to TID display If one use factory radio with this setting data collision will occur and none or random data will be displayed However this will not lead to any disfunction LCD display Display width LCD WIDTH Select number of charac ters in a single line in range 12 20 Number of lines LCD LINES Select number of lines one or two For a single line the way of work cor responds to TID display For two lines the upper one displays instantaneous speed and estimation of fuel and distance remaining on your tank The lower line corresponds to TID display Second line offset LCD OFFSET In the editor enter an address number in range 0 127 of the first character in the second line This option allows to deploy practically every model of LCD display TID display selection The YACC computer works with factory display used in Opel cars There are two variants of displays with 8 or 10 digits The proper display type can be selected with 8 10 jumper 8 10 jumper 8 digit display 10 digit display open close
13. 11 of 17 26 Display Display Display Corsa B Astra F Corsa C Astra G Vectra B Signal description Signal description Signal description 1 Battery 12V 1 Key on voltage 12 V 1 Battery 12V 3 Ground 2 Control signal 12 V 2 Ground 5 Key on voltage 12 V 3 Battery 12V 5 Key on voltage 12 V 8 Control signal 12 V 6 Ground 8 Control signal 12 V 9 SCL 9 Traveled distance signal 9 SCL 10 MRQ 10 SCL 10 11 SDA 11 SDA 11 SDA 12 Traveled distance signal 12 12 Traveled distance signal Figure 3 Display connector Figure 4 Radio receiver connector YACC User Manual Page 12 of 17 gt SPD 1 4M M A T Y Y 02 960 5s RPM KM H Y Y Y 0 80 KM H lt 10M FA MES guis Sars Y 0 100 KM H 20M FH ee SS w Y 50 M FK FX wa rt ae Y 100M F a lt SSS Y FUEL 200M COST 500 M BATT 1 TRIPS He Figure 5 Working modes RESET m gt DONE Y EDIT ADD VALUE Y EDIT CAL VALUE c SS Y b EEN PRICE m VALUE EXIT SSS 1 BEGIN il TRIP 1 END O TE Y BEGIN as Ln T
14. RIP 2 END Lj BEGIN TRIP 3 END Y ma DONE DONE DONE YACC User Manual Page 13 of 17 CONFIG DONE s PRESETS DISTANCE gt EDIT ASTRA G DONE VALUE Y Y Y TANK EDIT EDIT SPEED COEF EXIT y Y Y Y 2 x Y SELECT WARN EDIT EDIT ves NO ANT FUEL COEF L Sunn gt NOISE 07 Gss GENER Guss RISING CURREN EDIT RISING ves NO pm OPEL RPM SOURCE UNS E SOURCE S 2 lt Y Y Y Y Y EDIT SELECT EDIT EXIT BATTERY TMN JD CC VUE TMN DL Y _ Y Y Y EDIT EDIT EDIT RADIO TMAX COEF b gt JALUE TMAX R V 4 lt d S d d d SELECT M Ur WIDTH LCD EXIT HISTORY EXIT 22 2 NOEL Y Y Y SELECT SELECT EXIT CFG SOURCE Y Y ie Y Y EDIT EDIT VALUE Pq OFFSET VOLTAGE E HUM 1A 01234 9A 00000 d lt d b d d Y Y EDIT Y Y EXIT COEF re 1B 12345 00000 Y EXIT Y 1C 67890 9C 00000 Figure 6
15. YACC User Manual Page 1 of 17 Yet Another Car Computer Yet Another Car Computer is do it yourself electronic device addressed to middle skilled hobbyists Opel cars are primary destination of YACC which works with cars dis plays preserves genuine interior look and seems to be a factory device Moreover YACC can work with pop ular alphanumeric LCD displays This feature extended configuration and painless calibration method make pos sible to install YACC in practically every car equipped with fuel injection Functions 1 Instantaneous speed measure ment with precision of 0 1 km h 2 Traveled distance measurement Automatically shown every time vehicle stops 3 Average speed measurement Two values are measured a total av erage speed b average speed cor responding to motion i e only re ferring to periods of time when ve hicle is moving 4 Time of journey and time when ve hicle is stopped measurement 5 Cost of used fuel 6 Fuel consumption a average since key was turned on b in stantaneous corresponding to last 5 second c instantaneous cor responding to road segment of length ranging from 50 to 1000 meters 7 Used fuel gauge Low fuel level warning a estimation of fuel level in the tank b distance es timation remaining on the tank given mileage 8 Three trips Each trip meters distance average speed time of journey average and total fuel consumption and
16. bit precision When a calculated value is big so much that cannot fit on a display an overflow con dition OVF is shown Technical specifications Supply voltage 5 27 V Supply current 21 mA YACC has a very large reserve of computational power Recorded maxi mum traveled distance signal ICP fre quency is equal to about 50 kHz and engine revolution signal INT1 to about 115 kHz In the test car cg 16 900 Crpm 1 2 traveled distance signal at assumed speed 180 km h corre sponds to frequency 845 Hz and uses 1 796 available computational power Engine revolution signal at assumed speed 6 500 rpm corresponds to fre quency 216 Hz and uses 0 2 96 com putational power Factory settings Factory settings correspond to Astra F with XIGXEL engine Engine revolu tion and fuel consumption signals were taken from Engine Control Module SPEED COEF 16 900 SPEED NOISE 15 SPEED SOURCE R SPEED T MIN 50 SPEED T MAX 60 FUEL TANK CAP 50 FUEL WARN LEV 9 FUEL CURRENCY PLN FUEL ACC 1 FUEL COEF 3 669 000 FUEL SOURCE L RPM COEF 1 2 RPM SOURCE R RPM T MIN 20 RPM T MAX 60 BATTERY COEF 1 607 RADIO ANT Y RADIO OPEL N LCD WIDTH 12 LCD LINES 1 LCD OFFSET 64
17. es In FK mode all amount of used fuel is in cluded in calculations In FX mode fuel used when vehicle was stopped is not included YACC returns to main menu automatically after 5 second Fuel gauge The amount of fuel used so far is shown The unit is 1 F 31 2 Long press enters the fuel related menu Successive short presses cycle through following commands a RESET counter reset Use this command every time you fill up but don t want to recalibrate fuel coefficient Long press resets the counter and confirms with message DONE ADD use this command every time you are filling your tank but not completely full Long press switches to editor mode EDIT where you enter the amount in 0 01 1 of fuel added CAL choose this command when you are filling your tank and want to use the data collected during the past tank to calibrate your fuel coefficient Long press switches to editor mode EDIT where you enter the amount in 0 01 1 of fuel added during this fill up PRICE fuel price Long press switches to editor mode EDIT where you enter fuel price in 0 01 currency unit Currency sym bol can be defined in FUEL CURRENCY mode EXIT returns to previous menu Automatically after 5 seconds or with a long press Fuel cost Fuel cost corresponding to traveled dis tance is shown EUR 10 6 Battery The battery voltage is shown The unit is V
18. ey was turned on During that time period a single long press resets and begins TRIP 1 Sport mode Long press in basic mode switches to sport mode Short presses cycle through runs 1 4 mile O 60 0 80 0 100 km h YACC automatically prepares to new run each time vehicle is stopped Run name 1 4 60 80 100 is shown on the left side and word ready RDY on the right one 1 4 RDY Timing commences automatically upon detection any motion The percent rel ative value of distance speed is shown on the left side Run time in second is shown on the right side 47 10 2 At the end of the run timing stops and run name is shown once more on the left side 1 4 21 0 Long press in sport mode switches back to basic mode Manual antenna steering When you turn radio on an antenna status ANT ON or ANT OFF is shown for 5 second Short press changes the state of the antenna to the opposite one During radio use a long press if not connected with another command changes antenna position to the oppo site one Turning the key off YACC turns off after 30 seconds of idle ness Configuration Pressing and holding button for 5 sec onds in tachometer mode switches to configuration menu A stereo symbol appears on 8 digit display and Dolby symbol on 10 digit one 20 seconds idleness switches automatically back to basic mode Editor Editor allows to enter numerical val ues and is available in selected work
19. gger ele ele bypassed le ele o used Assembly in the car Elements assembly on the circuit board is the first step The microcontroller IC1 is mounted into a socket YACC was designed for control but ton which switches the ground This corresponds with 8 digit displays e g Astra F In 10 digit displays e g Astra G the dot button switches positive volt age In order to adjust YACC to work with 10 ditig displays you should omit assembling D3 diode and make two additional connections on the circuit board A comprehensive description of as sembly is available on the web page e pmk eu en diy yacc know how YACC and LCD displays Due to users feedback the possibility of communication with popular LCD displays based on HD44780 driver has been added to the YACC computer Connection The way of connection of LCD dis play to YACC computer is shown on figure 10 Connections have to be made with wires soldered directly to the points on printed circuit boards Depending on the display type it could be necessary to use contrast reg ulation R1 variable resistor and or backlight current restraint R2 resis tor YACC User Manual Page 6 of 17 Supply Depending on current consumption by LCD display backlight current ranging from tens to hundreds mA is the most significant factor it would be necessary to use additional voltage regulator or might be possible to use existing one after substi
20. ing modes Editor is always entered with a long press Next short presses cy cle through successive digits and com mands CANCEL and SET The SET com mand is visible only when a value has been changed and a new value is in proper range Long press during SET command stores a value ends editor mode and returns to the mode editor was started from Long press during CANCEL command ends editor mode without any changes Long press during digit selection switches into a mode which allows to change digit value Short presses se lect new value and a long press accepts it Defaults Astra F PRESETS ASTRA F Long press recalls default fuel measurement values for As tra F FUEL COEF 3 669 000 FUEL SOURCE L Astra G PRESETS ASTRA G Long press recalls default fuel measurement values for As tra G FUEL COEF FUEL SOURCE 27 700 F Speed and distance Calibration SPEED DISTANCE Use the following procedure Begin TRIP 1 and reset the mechanical distance counter at the same time Travel some tens of kilome ters With a long press switch to edi tor mode and enter traveled distance in meters The calibration coefficient c4 will be calculated automatically One needs to remember that most mechanical counters work in two di rections count downward while go ing backward YACC uses a pulser and does not distinguish directions Calibration coefficient
21. lated from the length or count of impulses gener ated by Engine Control Module ECM or taken from signal driving injector a Times of rising and falling edges are recorded with the same accuracy as in instantaneous speed measurement Maximum length of impulse equals ap proximately 21 ms Longer impulses are rejected Times of impulses tz t and t4 t3 corresponding to high H t or low L level respectively u t te t4 k ah L 4 t are summarized 32 bit counter Sf b Rising YACC User Manual Page 7 of 17 u 1 2 i t or falling u 1 2 edges are counted in Xf Selection of corresponding signal level or edge is set during configuration FUEL SOURCE mode The amount of used fuel is calculated with the follow ing formula xf Cfuel Calibration process consists esti mation of crue coefficient which value is in the range 1 99 999 999 FUEL COEF mode In the test car value turned out to be 3 669 000 and corresponded to fuel counter capacity over 1 170 liters Calibration process is described in detail in further sections FUEL HISTORY mode Time The measurement of trip time and time when vehicle is stopped uses 32 bit clock counters with resolution equal approximately to 1 40 second There fore the maximum range is over 190 years Accuracy of mathematical calcula tions Mathematical calculations per formed with 64
22. nal selection FUEL SOURCE The letter L selects length measure of low level the letter H high one the letter R counts rising edges and F falling ones Long press cycles through L H R F Tachometer Calibration coefficient RPM COEF Long presses cycle through subsequent c coefficient values 1 2 3 4 5 6 5 5 1 b 4 Edge selection RPM SOURCE The letter R corresponds to rising edge and the letter F falling one Long press changes between R and Minimum measurement time RPM T MIN In editor mode enter value in range 10 110 in hundred parts of second Maximum measurement time RPM T MAX In editor mode enter value in range 10 110 in hundred parts of second Battery Calibration BATTERY VOLTAGE Measure a battery voltage with a multimeter With a long press switch to editor mode and enter measured value in units 0 01 V The calibration coefficient Cban will be cal culated automatically Calibration coefficient BATTERY COEF In editor mode enter Value in range 1 65 535 The A D converter resolution is equal to 10 bits Value u 1 023 corresponds to voltage YACC User Manual Page 5 of 17 1 1 V The value shown in battery volt age mode BATT is calculated with the fol lowing formula Cbatt 10 000 Radio Manual antenna steering RADIO ANT Value YES enables and value NO disables manual antenna con trol Long
23. nd long presses by thick horizontal ones TRIPS TRIP 1 Basic mode While driving instantaneous speed v is shown in km h SPD 50 2 If tank capacity FUEL TANK CAP is set and an amount of fuel remaining in tank difference between defined tank capacity and used fuel F is lower than warning level FUEL WARN LEV than the following data are shown instead of letters SPD a Tank fuel level in liters F10 50 2 Here F10 means that 9 5 lt TANK CAP F lt 10 5 b Estimated distance remaining on the tank in kilometers D124 51 4 This distance is calculated using current average fuel consumption FA When the vehicle stops condition v 0 5 km h the following values are displayed a Traveled distance in meters M 12005 or for distances greater than 100 km in kilometers KM 1200 1 b Average speed excluding the time when the vehicle was stopped total average speed in km h A 40 32 7 c Total time of trip time when vehi cle was stopped in minutes T 20 4 For total trip time greater than 60 minutes both times are displayed one after another Time of trip T 2H30 and time when vehicle was stopped W OH25 d Fuel cost EUR 20 4 5 YACC User Manual Page 2 of 17 The first value corresponds to TRIP 1 and is shown only for active trip The second value corresponds to current traveled distance since key was turned on Distance travel time and fuel cost mea surements star
24. t each time when the key is turned on precisely since the first moment when v gt 0 5 km h and end when the key is turned off Tachometer The value of engine revolutions per minute is shown RPM 1200 Average fuel consumption Average fuel consumption correspond ing to traveled distance since the key was turned on is shown The unit is 1 100 km FA 7 5 User can choose between displaying numerical values related to consumed fuel averages FA FH FK FX fuel counter F with accuracy of one or two decimal digits after decimal dot FUEL One should remember however that TID allows to display decimal point be tween two most right digits only With two digit accuracy result will be shown as integer with unit 0 01 1 100 km FA 750 Instantaneous fuel consumption per hour Instantaneous fuel consumption corre sponding to last 5 seconds is shown The unit is 1 h FH 1 2 Instantaneous fuel consumption cor responding to segment of the road Instantaneous fuel consumption corre sponding to the preceding segment of the road of selected length 10 m 20 m 50 m 100 m 200 m 500 m 1 km is shown The unit is 1 100 km FK05 8 5 Or FX05 8 5 Long press enters settings mode en abling to select length of the segment of the road Next short presses cycles be tween values 10 m 01 20 m FK02 50 m FK05 100 m FK1 200 m 2 500 m 5 1 km F1KJ Long press switches between FK and FX mod
25. t presses cycle between successive results 20 seconds of idle ness returns to basic mode Results are shown in order reverse to chronological 1 past fill 2 fill before past etc A single fill is repre sented by 3 values A amount of fuel in 0 01 liters B beginning 5 digits uf C ending 5 digits of Xf Example results 1A 04328 1B 01855 1 82273 2A 04409 2B 01619 2C 59814 3A 03844 3B 01313 3C 73735 4A 04163 4B 01538 4C 56441 5A 04312 5B 01553 5C 67922 6A 03736 6B 01389 6C 54037 TA 04358 7B 01599 7C 57383 8A 04346 8B 01594 8C 08461 Liters gt f 1 43 28 185 582 273 2 44 09 161 959 814 3 38 44 131 373 735 4 41 63 153 856 441 5 43 12 155 367 922 6 37 36 138 954 037 7 43 58 159 957 383 8 43 46 159 408 461 We assume that amount of used fuel U fuel 1 proportional to total length gt f of recorded impulses Ufuel Cfuel gt f The method used to obtain value of Cfuet consists in filling up the fuel tank of car until the pomp stops However this method has potentially many er rors like inaccuracy of the pomp work the moment pomp stops etc Results are shown on figure 9 Points corresponding to fills 2 4 5 6 7 and 8 are approximately linear Fills 1 and 3 have thick errors and has been excluded from further analisys A straight line y crue x has been fitted with least square method Sig
26. tuting original IC5 LP2950 3V3 circuit with 5V equivalent e g LP2950 5VO 781 05 Display selection Display selection is determined with PC3 input Connecting the input with the ground with LCD TID switch or simply with wire selects LCD display Leaving the input unconnected selects TID display Restoring factory settings Improper configuration can couse that information will not be displayed prop erly Closing 8 10 jumper and powering device restores factory settings LCD WIDTH 12 LCD LINES 1 LCD OFFSET 64 Measurement methods Speed and distance Speed and distance measurements use electric impulses generated by a special device called pulser Impulses are counted in 32 bit counter Thus assuming that 1 km corresponds to 16 900 impulses real value for test car the counter range is over 250 000 km Additionally times of the rising R or falling F edges are recored Edge type can be selected during configuration SPEED SOURCE mode Resolution of measure ments is equal approximately to 21 According to the number of im pulses k and their times tn instan taneous speed is calculated with the following formula k 46875 3600 fkm Cdist tn k tn Setting value of caist coefficient in range 1 65 535 makes it possible to adjust device to every car Suggested calibration method is explained in fur ther parts SPEED
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