Construction

CONSTRUCTION





TRACTION CONTROL SYSTEM (TCS) CONTROL UNIT

Driving Control - when the drive wheel speed exceeds the vehicle speed by a given amount, the TCS control unit judges that the drive wheels are slipping, and it outputs the traction control signal to reduce engine power.

Handling Control - based on signals about right and left driven wheel rotational speeds, the control unit calculates the vehicle's "yaw" rate (the turn rate of the vehicle's body). Based on signals from the steering angle sensor, the control unit also calculates the yaw rate expected by the driver. If the difference between actual and expected yaw rates is substantial - that is, if the direction of the vehicle's body will exceed the driver's expected line - the control unit signals the TCS control valve actuator and PCM, thus reducing engine power and maintaining the expected line.

Rough Road Control - based on signals from the wheel sensors, the control unit detects a rough road based on frequency of wheel rotational vibration. The control unit then signals the TCS control valve actuator and PCM to relax engine power, thus improving acceleration efficiency.

Grip Control - based on signals about wheel speed and yaw rate, the control unit determines the efficiency of the grip of the tires on the road and signals the TCS control valve actuator and PCM to relax engine power if necessary, thus improving grip.