Traction Control
The Traction Control function allows for multiple wheel speed inputs to be used to detect loss of traction. The Elite ECU can cut cylinder outputs to reduce power and regain lost traction.
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Page Contents |
Wiring Tab
Options
Traction Control Type
Vehicle CAN Torque Limit
If the vehicle is equipped with a supported CAN-based unit which transmits a torque limit, this can be used for traction control.
PID From Vehicle Speeds
Allows wheel speed sensors to detect loss of traction, and implements a cut in order to reduce slip and regain traction. A minimum of a single front and a single rear wheel speed sensor is required to use this function.
Switch Enable
This allows a switch to be used to enable or disable Traction Control.
Traction Control Torque Limit Source
Disabled
Disables the Traction Control Torque Limit Source
CAN Input
Sets the input for the traction control torque limit to the vehicle CAN.
Connections
Traction Control Torque Limit Input
Available when the Traction Control Type is set to Vehicle CAN Torque Limit
Traction Control Switch Input
Available when the Traction Control Switch is enabled. Select an appropriate input to be used for this function. An AVI or SPI may be used.
Connection Type
SPI
An SPI (Synchronised Pulsed Input) requires configuring of the edge and the type of Sensor to be connected.
Edge Select
Falling is used when the input is grounded when the switch is activated. Rising is used when the input is supplied voltage when the switch is activated.
Sensor Type
Set to Hall Effect for all switch inputs
Pullup
Enables a pullup if required to generate a voltage when the switch is off.
AVI
An AVI will require Switch On and Switch Off voltages to be configured so the Elite ECU can know which voltages on the AVI meet the conditions required.
Switch On Voltage
The voltage either above or below where the switch is considered to be ON. When selecting an appropriate value some consideration should be given to allow for voltage fluctuations.
Switch Off Voltage
The voltage either above or below where the switch is considered to be OFF. When selecting an appropriate value some consideration should be given to allow for voltage fluctuations. Eg. if the switch is at 5V when it is Off and is grounded to 0V when the switch is On, you would set the On voltage to 1.0V and the Off Voltage to 4.0V.
Example 1
The switch is at 5V when it is Off and is grounded to 0V when the switch is On. Correct settings with tolerance would be to set the On voltage to 0.5V and the Off Voltage to 4.5V. i.e. when the voltage falls below 0.5V it is considered to be ON, and when it rises back above 4.5V it is considered to be OFF.
Example 2
The switch is at 2.5V when it is OFF, and is at 12V when it is ON. Correct settings with tolerance would be to set the On Voltage to 4.5V and the Off Voltage to 3.0V. i.e. when the voltage rises above 4.5V it is considered to be ON, and when it falls back below 3.0V it is considered to be OFF.
Settings Tab
General Settings
Driven Wheel Minimum Speed
The Traction Control function will not activate until the wheel speeds are above this amount. This is to allow correct calculation of wheel slip.
Ramp Out Rate
Select the aggressiveness of how quickly power is re-introduced after cylinders have been cut.
Cut Method
Ignition Cut
Ignition Outputs will be cut to limit engine power. This is the more common method.
Injection Cut
Injection Outputs will be cut to limit engine power.
Conditional Activation
Condition Enable
Enable an ECU condition that must be met to allow Traction Control to activate.
When Traction Control Switch is On
And/Or
Allows the Traction Control Switch And/Or an ECU condition to be combined to allow Traction Control to activate.
Select
Select the ECU channel to be used.
Maths
A selection of Equal To, Not Equal To, Greater Than, Less Than, Greater Than Or Equal To, Less Than Or Equal To that is to be used.
Value
The value the maths must meet to enable the condition.
Related Tables
Desired Slip Table
Under ECU Navigator>Traction Control>select Desired Slip Table
This is the differential speed between the driven and undriven wheels for FWD and RWD vehicles. For AWD vehicles, this is the difference between the fasted and slowest speed sensors. If the actual slip value is larger that the value derived from this table, the traction control function will apply the chosen Cut Method to limit wheel slip. Up to 3D (8x8) mapping is allowed.
PID
Under ECU Navigator>Traction Control>select PID Tuning
This allows mapping of the rate of closed loop operation of Traction Control so that it can achieve the desired slip amount.
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