Traction Control - ECU Master EMU User Manual

TRACTION CONTROL

Traction control strategy allows engine torque to be reduced in the case of wheel slip. Wheel slip is
detected based on engine RPM increase. For the traction control strategy to work correctly a VSS
sensor or gear sensor is required. In addition to gear detection, a rotary switch (or potentiometer)
should be installed. The rotary switch is used for traction control sensitivity control.
The main variable used in traction control strategy is the value of TC dRPM RAW. This value
equals the current change in engine RPM. When the TC dRPM RAW is too high for a given gear,
wheel slip is occurring and torque reduction should be performed. The torque reduction is
performed by cutting spark events. The Traction control/Gear Scale table is used to define the
different torque transfer for each gear. In addition the sensitivity of traction control can be adjusted
by rotary switch or potentiometer and is defined with Adj. scale table.
The torque reduction is defined in Traction control/Torque reduction 3D table. The Y axis value (TC
Delta RPM) is calculated as follow:
TC DELTA RPM = TC dRPM RAW * Gear Scale[Current gear] * Adj. Scale[Switch pos]
PARAMETER
Enable TC
Disable if second table
set
After gear cut disable
time
Sensitivity
Adjustment switch input
TC active output
Minim speed to activate The minimal vehicle speed to activate traction control strategy
DESCRIPTION
Activation of Traction Control strategy
This option allows to disable traction control when the second tables
set is active
The time after Gear Cut strategy is activated, when the Traction
Control is not active
The time base for dRPM Raw integrator. The lower value the lower
dRPM Raw value
Analog input that potentiometer or rotary switch is connected to
control TC sensitivity
The output used for traction control activity indication
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