User Manual
Contents
1. MoTeC SDC3 15 Appendices Appendix B SDC3 Pinout and Links SDC3 Connector Pinout Pin Function Notes 1 Not connected 2 CAN HI 3 Not connected 4 Down Switch Input C DIFF switch switch to OV 5 Rear diff temperature input OV when temp high 6 AUTO MANUAL switch input For future use switch to OV H Diff relay control output Solenoid power relay control active low 8 Brake pedal input OPTIONAL 12V when brakes applied 9 Front right speed sensor input OPTIONAL Magnetic or Hall sensor 10 Front left speed sensor input OPTIONAL Magnetic or Hall sensor 11 Battery input Power for electronics 12 Not connected 13 Diff power input Solenoid power from relay 14 Diff power input Solenoid power from relay 15 Diff Drive output Solenoid positive 16 Handbrake input OPTIONAL OV when handbrake ON 17 Battery input 18 CAN LO 19 Yaw sensor input OPTIONAL 18mV S scaling offset Yaw Ref 20 Lateral G input OPTIONAL 1V G scaling Offset Yaw Ref 21 Yaw Ref OPTIONAL 2 5V Reference for Yaw and Lateral G 22 Up Switch Input C DIFF switch switch to OV 23 AV2 Reserved for future use 24 AV1 Reserved for future use 25 Throttle Position Sensor input OPTIONAL 0 5V 26 Rear right speed sensor input OPTIONAL Magnetic or Hall sensor 27 Rear left speed sensor input OPTION2. Vehicle Communications The SDC3 communicates with the ABS module Body Integrated unit ECU Yaw G sensor and Steering Angle Sensor over the CAN bus using the factory wiring loom The SDC3 receives wheel speeds brake status yaw lateral G longitudinal G steering angle ABS status throttle position and manifold pressure on the CAN bus MoTeC ADL M800 Communications The SDC3 transmits CAN messages at 50Hz containing information about all input and output functions such as speed readings diff currents duty cycles etc The SDC3 transmits CAN messages at 25Hz containing diagnostic information such as fault flags firmware versions etc The ADL can be configured to receive all these channels and an M800 ECU can be configured to receive a subset of the channels To configure an ADL to receive SDC3 messages use the SDC3 and SDC3 Diagnostics communications templates included with Dash Manager See Appendix E ECU Communications for information on configuring an M800 ECU to receive SDC3 messages The transmission of CAN messages can be disabled This feature may be used to prevent reverse engineering of user control modes Miscellaneous functions Diff Temperature Override The diff temperature override functionality allows a specified control mode to be used if the rear diff overheats If this functionality is enabled the current user control mode 1 4 is overridden with the configured override mode 0 100 or
3. 25Hz Messages noeeoeseneeeeeeeeeerttesrettrtrrsttertrennsetsrrtennrnesteennen netee nten 22 MoTeC SDC3 1 Introduction Introduction The Subaru Diff Controller 3 SDC3 is a direct replacement for the Driver Controlled Centre Diff DCCD controller in the 2008 WRX STi and similar vehicles This manual covers the installation configuration and functionality of the SDC3 MoTeC SDC3 2 Functionality SDC3 Functionality Mode selection There are six user selectable control modes four of which are user configurable The control modes are selected using the C DIFF toggle switches in the centre console and indicated on the dash board as follows Switch Direction Dash Display SDC3 Mode LOCK ODO 100 lock I ODO User Mode 4 I ODO SES User Mode 3 I ODO User Mode 2 MoTeC SDC3 3 Functionality Lock Calculation Lock percentage applied to the centre diff is determined primarily by the vehicle speed throttle position or manifold pressure and front to rear wheel slip Each the four user modes are configured with an acceleration table a braking table a desired slip table and slip control parameters Slip control and ABS override may be disabled if not required The lock percentage for a user mode is determined according to the following strategy Vehicle Accel Speed table lock lock Throttle Position or Manifold Desired P
4. ABS Active Detection riisiin iiion deiina 7 Gen ET EEN 8 Computer reoulrements cece eeeeeeeeaeaeeeeeeeseeaeaeeeeeeeeneneaeeeeees 8 Connecting toa SDC3 ss iicieages deni wate Aidit ea ea ee i ieh 8 Installing SDC Manager 8 Managing Confourations 8 Changing Configurations 0 cc ececeeeeeneeeeeeeeeeeeeeeeeeaeeeeeneeeeetiaeeeeeenaeeeenneeeeneaa 8 User Mode Tables 21 EEN ENNEN 8 File Setup Input Setup s n crniiin iina 9 File Setup Input Tables 0 0 ccsssecsedisecessueeessecthtevsscoee ess phew cateesai 10 File Setup Outp Utz sz eenee eee ds che bce tastes deeg ENNER 10 File Setup User Modes nnosssnnnenessennnnensneennnnnnesrernnnnnssrernnrnnsneennnt 11 Monitoring SDC3 Datay sgod issn aie eesti sed eevee E e dee 12 Sending Firmware sisisi sienna eaii aaa aiani 12 SDC3 Installation eeeEEEEEKEEEEEEEEEEEEEEEEEEEEEEEEEEREEEEEENEn 13 DECHE 14 Appendix A Fault Codes eene eester tr resetttnnrnsrtertntnnnrestrten nenene ee 14 Appendix B SDC3 Pinout and Links eeeeeieeeerirsrirerrrreeriresrresrernss 15 SDC3 Connector Pinot 15 ENKS ipai e e a a ae 16 Appendix C CAN Wiring Drachces A 17 Appendix D Removing ABS svstems 18 Appendix E ECU Communications 00 ccc eeeeeeeeeeeeeeeeneeeeeenneeeeeeneeeeenneeeeneaa 19 Receiving SDC3 Data cisnce ie edeN dech Nee 19 Receiving ECU Data EE 20 Appendix F CAN Messages 21 5ORIZ MESSAGES 20518255022 eege eege a ta aaa Eees 21
5. These wires must be Twisted Connector end of the CAN Bus Minimum one twist per 50mm 2in ov 500mm T av lt lt CAN Bus gt gt ver 8 CG Be 500mm Max Short CAN Bus If the CAN Bus is less than 2m 7ft long then a single termination resistor may be used The resistor should be placed at the opposite end of the CAN Bus to the CAN Cable connector MoTeC SDC3 18 Appendices Appendix D Removing ABS systems Details of ABS removal will be provided in a future version of this manual MoTeC SDC3 19 Appendices Appendix E ECU Communications The SDC3 can communicate with the MoTeC WRX V910 OEM ECU using the factory CAN bus Receiving SDC3 Data To receive SDC3 data one of the ECU CAN setup slots must be configured in ECU Manager as M800 ECU Receive on CAN ID 500 under Adjust gt General Setup gt Communications gt CAN Setup CAN Setup Parameter Value CAN 2 Data CAN 0 Data 8 Selects the data that is sent or CAN 0 Address 1040 received on this CAN Channel CAN 0 Transfer Rate 50 BR2 Lap Beacon ID 0 O Off CAN 1 Data 0 1 PLM Receive CAN 1 Address 0 2 888 E816 Receive CAN 1 Transfer Rate 50 3 MDD Wheel Receive 4 ADL Receive CAN 2 Address 500 5 M800 ECU Receive CAN 3 Data 0 6 BR2 Receive CAN 3 Address 0 7 DBW4 Transmit CAN 4 Data 0 8 DBW4 Receive CAN 4 Address H FARR F ATA Transmit If the CAN Setup is configured data from the SDC3 can be assigned to ECU channels using inputs ECU2 1 to
6. one of the 4 user modes while the rear diff temperature input is active The diff temperature override does not occur if the thumbwheel is in the full lock or open lock positions To prevent rapid transitions between control modes when the diff heats or cools the diff temperature input must be stable in a new state high or low for 2 seconds before the input is considered to have changed MoTeC SDC3 7 Functionality For information on configuring the diff temperature override see Setup User Modes in the SDC Manager section Fault indication Faults are indicated by the flashing of the AUTO and AUTO lights above the LCD display on the dash The lights will continue to flash until there have been no faults present for 2 seconds Fault codes and diagnostic codes are included in the CAN diagnostic messages as described in Appendix A Fault Codes ABS Active Detection The ABS unit transmits status information to the SDC3 ABS Active Detection may be disabled to ignore the status of the ABS in the diff lock calculation See Setup Input in the SDC Manager section MoTeC SDC3 8 Setup SDC Manager The SDC Manager software is necessary to configure an SDC3 unit from a PC A new SDC3 unit must be configured before its initial use Computer requirements The SDC Manager software runs under Windows 95 98 ME NT4 2000 or XP operating systems The minimum recommended PC specification is a Pentium 90 with 16MB RAM a
7. the SDC Manager section Speed Calculations The method of calculating front rear and vehicle speeds is dependent on the status of the brake input When the foot brake is applied speeds are calculated as follows e Front Speed is the faster of the two front wheel speeds e Rear speed is the faster of the two rear wheel speeds e Vehicle speed is the faster of the calculated front speed and rear speed When the foot brake is not applied speeds are calculated as follows e The front speed is the average of the two front wheel speeds weighted 80 towards the slowest front wheel speed If one front wheel speed is less than half of the other front wheel speed then front speed is simply the faster of the two front wheel speeds e The rear speed is the average of the two rear wheel speeds weighted 80 towards the slowest rear wheel speed If one rear wheel speed is less than half of the other rear wheel speed then rear speed is simply the faster of the two rear wheel speeds e The vehicle speed is the average of the front and rear speeds weighted 80 towards the slowest speed If either the front or rear speed is less than half of the other speed then vehicle speed is simply the faster out of the front speed and rear speed If any wheel speed exceeds 300km h the sensor reading is ignored until its speed returns to below 300km h for 2 seconds This is to prevent erratic behaviour from noisy wiring or faulty sensors Brake Status The SDC
8. 3 can be configured to use one of two different methods to measure brake pedal and hand brake status CAN Status Default method The brake pedal switch is wired directly to the ABS unit and the hand brake switch is wired directly to the body integrated unit body computer This is the method used by the factory DCCD controller and requires no modification of the wiring Direct Wired Switches The brake pedal and hand brake switches may be wired directly to the SDC3 connector by modifying the vehicle wiring MoTeC SDC3 6 Functionality Throttle Calibration The throttle position sensor input can be calibrated using a table to convert voltage to throttle position This allows non linear calibration of throttle position to more closely model the change in torque vs throttle butterfly angle The SDC Manager configuration program allows throttle input voltages to be read directly from the SDC3 in order to perform 0 and 100 calibrations For information on calibrating the throttle input see Setup Input in the SDC Manager section Communications The SDC3 communicates on the factory CAN bus at 500kBit sec PC CAN Connection A CAN interface to the SDC3 is provided using a MoTeC OEM Communications cable that plugs into the SDC3 board This cable also provides the power required if the MoTeC CAN cable is used to interface with a PC The MoTeC UTC USB To CAN adaptor or the MoTeC CAN cable can be used to connect the PC to the CAN bus
9. 8 2 Diagnostic Flags See Appendix A Fault Codes 3 4 Fault Flags See Appendix A Fault Codes 5 6 SDC3 Firmware version 7 Eg 123 V1 23
10. AL Magnetic or Hall sensor 28 Battery input 29 Battery input Appendices MoTeC SDC3 16 30 Battery input 31 Battery input 32 Diff drive output Solenoid negative switched Links The only user changeable link is LKO5 on the back of the SDC3 circuit board This link may be soldered closed to place a 1000hm termination across the CAN bus MoTeC SDC3 17 Appendices Appendix C CAN Wiring Practices NOTE The factory CAN bus in the STi is already terminated This information is provided as a reference for adding extra devices to the bus The CAN bus should consist of a twisted pair trunk with 100R 0 25Watt terminating resistors at each end of the trunk The preferred cable for the trunk is 100R Data Cable but twisted 22 Tefzel is acceptable The maximum length of the bus is 16m 50ft including the MoTeC CAN Cable PC to CAN Bus Communications Cable CAN Devices such as MoTeC ADL M800 etc may be connected to the trunk with up to 500mm 20in of twisted wire The connector for the CAN Communications Cable may also be connected to the trunk with up to 500mm 20in of twisted wire and should be within 500mm of one end of the trunk If desired two CAN Cable connectors may be used so that the MoTeC CAN Cable may be connected to either side of the vehicle Both connectors must be within 500mm of each end of the trunk i ba CAN Cable 100R Terminating ee cack
11. AN 5 Data 0 8 Custom Data Set 1 Sequential CAM E Addrase pn 9 Custom Nata Set Senuential MoTeC SDC3 21 Appendices Appendix F CAN Messages SDC3 operational data messages are each transmitted at 50Hz SDC3 diagnostic messages are each transmitted at 25Hz 50Hz Messages CAN ID 0x1F4 Byte Bits Data 0 Compound Id 0 1 Diff Current Average 0 1A resolution 2 Ground Speed 0 1 km h resolution 3 4 Front Wheels Speed 0 1 km h resolution 5 6 Rear Wheels Speed 0 1 km h resolution 7 CAN ID 0x1F4 Byte Bits Data 0 Compound Id 1 1 Diff Current Minimum 0 1A resolution 2 Yaw rate 0 1 deg sec resolution 3 4 Lateral G 0 001G resolution 5 6 Longitudinal G 0 001G resolution 7 CAN ID 0x1F4 Byte Bits Data Compound ld 2 Diff Current Maximum 0 1A resolution Percentage Slip Diff Lock 0 1 resolution Percentage Diff Lock 0 1 resolution Steering Angle 1deg Resolution N 01 AION o Odeg centre deg anticlockwise deg clockwise CAN ID 0x1F4 Byte Bits Data Compound Id 3 Diff Voltage 0 1V resolution Fault Flags See Appendix A Fault Codes Diagnostic Flags See Appendix A Fault Codes AJOIN o Front Left Speed Sensor Fault 0 OK 1 Fault Front Right Speed Sensor Fault 0 OK 1 Fault Rear
12. Appendices Appendices Appendix A Fault Codes The SDC3 fault flags included in the CAN diagnostics are sent as a bit field 16 bit with the following faults Bit 0 0x0001 1 Bad Configuration CRC failure Bit 1 0x0002 2 Short circuit diff solenoid Bit 2 0x0004 4 Open circuit diff solenoid Bit 3 0x0008 8 Output driver failure Bit 4 0x0010 16 Diff Relay in vehicle loom stuck closed Bit 5 0x0020 32 Current protection specified in the configuration is too high for the hardware revision Bit 6 0x0040 64 Steering Angle Sensor reported fault Bit 7 0x0080 128 Brake status CAN message ID 0x512 not received Bit 8 0x0100 256 Hand brake status CAN message ID 0x514 not received Bit 9 0x0200 512 Wheel speed CAN message ID 0x513 not received Bit 10 0x0400 1024 ECU Throttle Position CAN message ID 0x410 not received Bit 11 0x0800 2048 ABS active status CAN message ID 0x512 not received Bit 12 0x1000 4096 Yaw G sensor CAN messages ID 0x070 amp 0x080 not received The SDC3 diagnostic flags included in the CAN diagnostics are sent as a bit field 16 bit with the following faults Bit 0 0x0001 1 Output circuit stopped Bit 1 0x0002 2 Output limited to protection current limit Bit 2 0x0004 4 Yaw Sensor fault Bit 3 0x0008 8 G sensor fault Bit 4 0x0010 16 Steering Angle Sensor not present on vehicle CAN bus
13. ECU2 12 in the Adjust gt Sensor Setup gt nput Setup window in ECU Manager The following data is sent from the SDC3 to the ECU SDC3 Data ECU Input Scaling Vehicle Speed ECU2 1 0 1 km h Front Wheel Speed ECU2 2 0 1 km h Rear Wheel Speed ECU2 3 0 1 km h Yaw Rate ECU2 4 0 1 deg sec Lateral G ECU2 5 0 001 G Longitudinal G ECU2 6 0 001 G Slip Lock ECU2 7 0 1 Lock ECU2 8 0 1 Steering Wheel Angle ECU2 9 1 deg Fault Flags ECU2 10 Bit field Diag Flags ECU2 11 Bit field SDC Mode ECU2 12 0to5 The ECU Manager examples below show the allocation of SDC3 channels to ECU speed and user channels Engine EGT DBW Servo User Lambda Cys Speed Other Channel Name eet Calibration Jett Yaw Rate User 1 ECU2 4 1 to 1 Unitless 1 decimal place 0 0 32 SDC3 Slip Lock User 2 ECU2 7 1 to 1 1 decimal place 0 0 32 SDC3 Lock User 3 ECU28 1 to 1 1 decimal place 0 0 32 Steering Angle User 4 ECU2 9 1 to 1 Unitless no decimal place 0 32 SDC3 Fault flags User 5 ECU2 10 1 to 1 Unitless no decimal place 0 32 SDC3 Diag amp Status flags User ECU2 11 1 to 1 Unitless no decimal place 0 32 0 SDC3 Mode User 7 ECU2 12 1 to 1 Unitless no decimal place se e le MoTeC SDC3 20 Appendices Engine EGT DBW Servo User Lambda Cyls Speed Other Channel Name Input Calibration ooo Left Drive Speed LD Spd ECU23 1 to 1 km h 1
14. Left Speed Sensor Fault 0 OK 1 Fault Rear Right Speed Sensor Fault 0 OK 1 Fault Foot brake Status 0 Off 1 On Hand brake Status 0 Off 1 On Diff Temperature Status 0 OK 1 Diff Temperature High ABS Active Status 0 Not Active 1 Active NIOO AJOIN O 6 0 7 SDC3 User Selected Mode 0 Diff open 1 to 4 SDC3 user modes 5 Diff locked Appendices MoTeC SDC3 22 CAN ID 0x1F4 Byte Bits Data 0 Compound Id 4 1 Throttle Position 1 resolution 2 Diff control duty cycle 0 1 resolution 3 4 Front Right Wheel Speed 0 1 km h resolution 5 6 Front Left Wheel Speed 0 1 km h resolution 7 CAN ID 0x1F4 Byte Bits Data 0 Compound Id 5 1 Diff Voltage 0 1V resolution 2 Desired slip 0 1 km h resolution 3 4 Rear Right Wheel Speed 0 1 km h resolution 5 6 Rear Left Wheel Speed 0 1 km h resolution 7 25Hz Messages CAN ID 0x1F5 Byte Bits Data 0 4 7 Compound Id 0 0 4 Reserved 1 2 Aux 5V Output Voltage 0 01V resolution 3 4 Battery Voltage 0 01V resolution 5 6 SDC3 Internal temperature 1 C resolution with 50 C offset 7 CAN ID 0x1F5 Byte Bits Data 0 4 7 Compound Id 1 0 4 1 Speed sensor noise fault flags Front Left 0x01 Front Right 0x02 Rear Left 0x04 Rear Right 0x0
15. ality Speed Measurement The SDC3 can be configured to use one of two different methods to measure wheel speeds ABS CAN Default method Four wheel speeds are detected by the ABS unit and transmitted over the CAN bus to the SDC3 This is the method used by the factory DCCD controller and requires no modification of the wiring Individual wheel speeds can be enabled or disabled and the speed calibration can be adjusted for different wheel sizes and sensor teeth Wheel Speed Sensors Up to four wheel speed sensors may be wired directly to the SDC3 connector by modifying the vehicle wiring The wheel speed inputs can be configured as hall effect or magnetic sensors with adjustable thresholds and individual sensors can be enabled or disabled The speed calibration can be adjusted for different wheel sizes and sensor teeth Magnetic sensor input thresholds are individually configurable for front and rear sensor pairs according to the current front and rear speeds Front rear and vehicle speeds are calculated from the wheel speeds and all speeds are transmitted in CAN messages for logging by the ADL Advanced Dash Logger Front speed rear speed and vehicle speed are also transmitted over CAN in a format that can be received by the MoTeC M800 ECU The MoTeC WRX V910 OEM ECU if fitted can be configured to log these wheel speeds or use them in engine control strategies For information on configuring speed inputs see Setup Inout Setup in
16. all four wheel speed inputs Pulses revolution Number of sensor pulses per wheel revolution Circumference units Units mm or inches used to specify the rolling circumference Rolling circumference Tyre rolling circumference specified in mm or inches Sensor Enable For Wheel Soeed and ABS CAN speed measurement methods The four speed sensors Front Left Front Right Rear Left and Rear Right can be individually enabled or disabled A disabled sensor has a speed of Okm h Factory default is all sensors enabled MoTeC SDC3 10 Setup Speed Sensor For Wheel Soeed speed measurement method Hall Magnetic If the speed sensor type is hall effect or equivalent a hall switching threshold must be specified If the speed sensor type is magnetic the Magnetic Levels table File Setup Input Tables must be configured Factory default is Hall Hall threshold The switching threshold for hall effect speed sensor inputs Factory default is 2 2V Enable ABS Active Detection If the ABS Active Detection is enabled then the ABS active status from the ABS computer is used as described in the diff control strategy in the SDC3 Functionality section File Setup Input Tables Magnetic Levels For Wheel Speed speed measurement method If magnetic wheel speed sensors are used the sensor thresholds must be specified in the magnetic levels table Thresholds are configured separately for front and rear sensors Up to 11 ascending speed
17. decimal place 0 0 Right Drive Speed RD Spd Left Ground Speed LG Spd ECU22 Right Ground Speed RG Spd 1 to 1 kmh 1 decimal place Receiving ECU Data If present the WRX V910 OEM ECU must be configured to transmit throttle position and optionally manifold pressure to the SDC3 on the CAN bus A custom data set must be configured in ECU Manager under Adjust gt General Setup gt Communications Setup Custom Data Sets This data set must contain Throttle Position and Manifold Pressure as shown below Custom Set 1 Custom Set 2 Item 1 Channel ooo O Add Throttle Position TP Manifold Pressure MAP Change Delete To transmit the custom data set one of the ECU CAN setup slots must be configured in ECU Manager as Custom Data Set 1 Sequential on CAN ID 1040 under Adjust gt General Setup gt Communications gt CAN Setup CAN Setup Parameter Value CAN 0 Data CAN 0 Data Selects the data that is sent CAN 0 Address 1040 on this CAN Channel CAN 0 Transfer Rate 50 BR2 Lap Beacon ID oO 0 Off CAN 1 Data D 1 ADL Dash Logger CAN 1 Address 0 2 Telemetry Monitor not CAN 1 Transfer Rate 50 normally used CAN 2 Data 5 3 MoTeC CRC32 normally used 4 CAN 2 Address 500 for MDD CAN 3 Data 0 4 Custom Data Set 1 CAC 32 CAN 3 Address D 5 Custom Data Set 2 CRC 32 CAN 4 Data 0 6 Custom Data Set 1 Compound CAN 4 Address D 7 Custom Data Set 2 Compound C
18. e values are not allowed Spacing between values is not fixed allowing non linear axes MoTeC SDC3 12 Setup Monitoring SDC3 Data Live data from a connected SDC3 may be monitored using the File Monitor Channels option or the M hotkey to open the Monitor Channels window Sending Firmware The SDC3 firmware is user upgradeable from a PC connected to the MDC with the MoTeC UTC USB To CAN or the MoTeC CAN cable To upgrade the firmware the SDC3 must be powered and connected to a PC with the SDC Manager software installed Use File Send Firmware to send the current firmware to the SDC3 MoTeC SDC3 13 Appendices SDC3 Installation The factory centre diff controller box is located on the passenger side behind the glove box A standard SDC3 installation involves the replacement of the factory controller circuit board and the addition of a cable to connect the CAN bus To remove the controller locate the box under the dash unplug the loom connector and remove the single bolt holding the bracket To remove the factory circuit board open the case lid four screws and undo the circuit board 4 screws If a permanent CAN cable is required a cable entry hole should be made in the case before the SDC3 board is installed and the CAN cable should be cable tied to the SDC3 board using the two holes provided next to the connector The SDC3 board is fastened using the 4 screws from the factory board MoTeC SDC3 14
19. g SDC configuration to an SDC3 configuration first load the SDC configuration then select File Convert SDC Config to create the SDC3 configuration To send the currently opened configuration to the SDC3 select File Send Config from the main menu or press F5 The configuration is automatically saved to disk when sent to the SDC3 A new configuration must be saved with a new name before it can be sent Changing Configurations User Mode Tables The four user mode each has a set of three tables that determine the diff lock characteristics for the mode The speed and throttle position or manifold pressure axis values used for all user mode tables are configurable under the File Setup option in the main menu and can have between 2 and 11 values Linear interpolation is used between table points The Acceleration table is used to generate the lock when the foot brake is not applied MoTeC SDC3 9 Setup The Braking table is used to generate the lock when the foot brake is applied and is an override table for the Acceleration table values If a cell in the braking table is left blank the corresponding cell value from the Acceleration table is used Cell values should only be entered into the Braking table where a different value is required from the Acceleration table The Desired Slip table specifies the value above which additional diff lock will be applied according to the slip control setup parameters The Acceleration a
20. he maximum amount of diff lock Ylock that can be added to attempt to control slip Slip control range This parameter is the amount of measured slip km h above the desired slip at which the Max slip control lock will be applied If the amount of measured slip is within the range desired slip slip control range then the amount of slip diff lock applied is proportional to how far the measured slip is away from the desired slip For more detail on slip control parameters and slip control examples see Slip Control in the SDC3 Functionality section Diff Temperature Override Override mode If this functionality is enabled the current user control mode 1 4 is overridden with the configured override mode Open Locked or one of the 4 user modes while the rear diff temperature input is active For more detail on the temperature override functionality see Diff Temperature Override in the SDC3 Functionality section Speed Axis Up to 11 values can be specified for the speed axis that is used in all of the user mode Braking and Acceleration tables The axis values must be ascending and duplicate values are not allowed Spacing between values is not fixed allowing non linear axes Throttle Axis or MAP Axis Up to 11 values can be specified for the throttle or MAP axis that is used in all of the user mode tables The table type throttle or MAP is determined by the Lock Table Axis option The axis values must be ascending and duplicat
21. in the lock percentage strategy above Slip control example Max slip control 10 lock Slip control range 20 km h Desired slip from Desired Slip table 10km h For a measured slip of 15km h slip diff lock 15 10 20 10 2 5 For a measured slip of 30km h or above slip diff lock 10 For information on configuring the slip control parameters see Setup User Modes in the SDC Manager section Diff Control Methods The SDC3 implements two methods of driving the centre differential selectable in the configuration Current Control Current output control regulates the solenoid current waveform by setting a minimum current and ripple factor for a particular lock percentage The parameters for this control mode are pre configured for the factory centre diff solenoid and should not be changed This is the recommended mode of operation Duty Cycle Control Duty cycle output control provides a PWM solenoid drive from 0 to 100 duty cycle for 0 to 100 calculated lock The frequency of the drive pulses changes linearly between specified frequencies for 0 100 lock This mode is not recommended as the effective diff lock will change with diff temperature An absolute limit for solenoid current can be configured for either control method and is pre configured for the factory centre diff solenoid For information on configuring the diff control method see Setup Output in the SDC Manager section MoTeC SDC3 5 Function
22. lt is 5 0A This parameter should only be changed by advanced users Min Pulse Width Max Pulse Width MoTeC SDC3 11 Setup The width of the diff control pulses varies linearly with the desired diff lock from Min Pulse Width at 0 lock to Max Pulse Width at 100 lock The factory default is 80uS to 800uS These parameters should only be changed by advanced users Output Current Protection The diff current output is hardware limited to a maximum of Output Current Protection Amps regardless of the control method used If the Current Control method is used this current must be at least one Amp higher than the Full Lock Current The factory default is 11 0A Allow CAN diagnostics The CAN data stream can be disabled or enabled This feature may be used to prevent reverse engineering of user control modes File Setup User Modes Lock Table Axis The Y axis of the user mode lock tables is configurable as Throttle Position or MAP Sensor The MAP Sensor option should only be used when the vehicle is fitted with a correctly configured MoTeC WRX V910 OEM ECU See Appendix E ECU Communications for more details Slip Control Enable Slip Control If slip control is enabled then the Desired Slip table and the slip control parameters are used to determine how much extra diff lock is applied to control wheel slip If slip control is disabled then the Desired Slip table has no effect Max slip control This parameter specifies t
23. nd Braking tables specify lock in 0 5 units The Desired Slip table specifies desired slip in 0 1 km h units For more information on the diff control strategy see the SDC3 Functionality section Editing Tables Cell values in the tables may be incremented decremented using the Page Up Page Down keys or entered directly Table regions may be selected cut copied and pasted within the application or to an Excel spreadsheet An entire table region can be filled with a value by selecting the region entering the value then pressing Enter Basic maths operations can be performed on a single cell or an entire table region To perform an operation on all cells within a region select the region then enter the number followed by the operator Examples To add 15 to all values in a region select the region then type 15 To multiply all values in a region by 0 8 select the region then type 0 8 Mode Notes Comments about each user mode may be entered in the Notes field and are stored with the configuration User Mode Table Font The font type and size for the User Mode Tables may be changed using the File Select Font option File Setup Input Setup Speed The speed detection method to be used must be chosen from the list of four methods Wheel Speed Tacho ABS CAN and ECU Ground Speed The appropriate parameters are shown when a speed detection method is selected Speed Calibration The speed calibration applies to
24. nd a parallel port or USB port Connecting to a SDC3 The SDC3 connects to the PC using either the MoTeC UTC USB To CAN adaptor or the MoTeC CAN cable connected to the PC parallel port The SDC3 unit must be powered to communicate with the PC Installing SDC Manager The SDC software can be installed either from the MoTeC Resource CD supplied with the SDC or from the MoTeC website software motec com au To start the program after installation click on Start gt Programs gt MoTeC gt SDC Manager SDC Manager 1 2 Managing Configurations An SDC configuration file determines exactly how the SDC3 unit will operate The SDC Manager software allows configurations to be created edited and sent to the SDC3 To prevent unauthorized copying of configuration data configurations cannot be read out of the SDC3 To create a new configuration select File New from the main menu or use the default configuration created on startup The default configuration has similar behaviour to the manual modes in the factory controller When SDC Manager is started or when new configuration is created then the user must select the configuration type SDC3 when prompted To open an existing configuration file select File Open from the main menu and select the desired file After a configuration has been created or modified it should be saved with a meaningful name by selecting File Save or File Save As from the main menu To convert an existin
25. olet SDC3 Subaru Diff Controller User Manual Copyright MoTeC Pty Ltd 2001 2008 The information in this document is subject to change without notice While every effort is taken to ensure correctness no responsibility will be taken for the consequences of any inaccuracies or omissions in this manual 20 June 2008 Contents ee TE Le LE 1 SDC3 Functionality eege eege 2 Mode selections niche eee A ee A erE 2 Lock Calculation s cc sccviesssecdcseceesvan scuesiee ieee dune d er lide cdendeeeduneeteecdecenteeos 3 Slip COMO PE a E EE sbueteed ss E T 4 Slip co trolexample iiiaae eade e ai aa Eea Aaea 4 Diff Control Methods AA 4 Current Control icc ea a eaa te aaae idasbese cutee gendsceaces es 4 Duty Cycle Control 2 2 cc cscceses ieee ceectee cede teeede sctevetucete ceceeedeedtatendecteaseveecs 4 Speed MeEasureMentss c cevineccscesecneedks r a A Ea E AEE A LN aA NES 5 Speed Calculations snye i a ai e ara 5 Brake Statys icipin tenerne DE d e SEKR dee SEgE DAS 5 Throttle Calibration EE 6 Bel ul line re 6 PC CAN Connections anain eaa ea a aa aaah anna 6 Vehicle Commumtcations eee eee enteeeeeeeeeeeeeeeeseeeaeeeeneeeeeenaeeeeeeaeees 6 MoTeC ADL M800 Communications ecceeeeeeeeenneeeeeeeeeeeenteeeeeeaaes 6 Miscellaneous FUNCTIONS 200 eee ceeneeeeeeeeeeeeeaeeeeeeeaeeesnaeeeeeeaeeeseeeeeeeeeneeeenenas 6 Diff Temperature Overtde 6 Fault indication 042 4aeiaha sai Manin ent Ae 7
26. ressure Slip table Slip lock kph Calculation Front amp Rear lock Speed Handbrake Slip control params The lock percentage for the full lock mode is determined according to the following strategy 100 Lock Sa bel For information on configuring the user modes see the SDC Manager section MoTeC SDC3 4 Functionality Slip Control The slip control strategy detects slip e rear speed front speed and increases diff lock to maintain slip close to the value specified in the Desired Slip table The Desired Slip table specifies the value above which additional diff lock will be applied according to the slip control setup parameters The calculation of lock percentage for slip control is determined by the Slip Control Range and Max Slip Control Lock parameters which apply to all user modes The following algorithm determines the lock for slip control The desired slip is the output from the Desired Slip table IF Rear Speed gt Front Speed THEN Measured Slip Rear Speed Front Speed ELSE Measured Slip Front Speed Rear Speed Slip Control Factor Measured Slip Desired Slip Slip Control Range Constrain Slip Control Factor to the range 0 to 1 Slip Diff Lock Slip Control Factor Max Slip Control Lock NOTE Slip is specified as speed difference between front and rear wheels not as a ratio of the speeds The addition of the calculated slip diff lock percentage is shown
27. s can be specified in the table and linear interpolation is used between points Throttle Position The Throttle Position table allows the throttle position sensor to be calibrated in up to 11 steps with linear interpolation between points The table specifies the throttle position characteristic between the TP Low voltage O in and the TP High voltage 100 in The Read buttons for the throttle sensor high and low voltages can be used to calibrate the sensor if the SDC3 is powered and connected to the PC To calibrate press the TP High Read button with the throttle pedal fully depressed then press the TP Low Read button with the throttle pedal fully released File Setup Output Output Control The output control method can be configured as Duty cycle or Current control as discussed under Diff Control Methods in the SDC3 Functionality section The default output control parameters should only be changed by advanced users Duty Cycle control is not recommended as the effective diff lock will change with diff temperature Full Lock Frequency Open Lock Frequency If duty cycle diff control is used the diff drive frequency varies between the Open Lock Frequency at 0 diff lock and Full Lock Frequency at 100 diff lock Full Lock Current The full lock current is the target diff current for a desired 100 diff lock The target diff current varies linearly between OA for 0 lock and Full Lock Current for 100 lock The factory defau
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