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Construction and Function
TCS Control unit
Acceleration 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.
Deceleration Control
When the drive wheel speed drops below 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 control engine braking properly.
Handling Control
Based on signals about driving wheel and driven wheel rotational speeds, the control unit calculates the car's "yaw" rate
(the turn rate of the car'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 car's body will exceed the driver's expected line — the control unit signals the throttle actuator, which closes the
throttle valve, 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 throttle actuator to relax engine power, thus improving acceleration efficiency.
Grip Control
Based on signals about wheel speed and lateral acceleration, the control unit determines the efficiency of the grip of the
tires on the road and signals the throttle actuator to relax engine power if necessary, thus improving grip.
Main Control Block
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