TCS CONTROL OUTLINE
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• The traction control system (TCS) control actuates torque reduction through engine control, as well as using brake control to control traction.
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Note
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• Engine control: Engine output is lowered by fuel cut and ignition timing control to reduce the traction, preventing driving wheel slip.
• Brake control: Brake fluid pressure from the hydraulic unit (HU) to the driving wheel that is slipping is increased, operating the brake and preventing driving wheel slip.
Features
• The left and right wheels are controlled at the same time by engine control. Therefore, when the road surface friction coefficients differ between the left and right wheels, proper torque reduction cannot be performed separately for each wheel. When this occurs, torque reduction is performed by independent left and right wheel brake control, providing more stable vehicle control.
• The TCS OFF switch allows the driver to optionally enable/disable the TCS control at the driver's discretion.
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― When both driving wheels are stuck, traction control according to the driver's operation can be performed by inhibiting the TCS control.
― If the left and right driving wheel speeds are different when the TCS control is inhibited, brake control is performed. Due to this, the ability to free the vehicle when one of the driving wheels is stuck has been improved.
― To ensure constant vehicle stability, the TCS control returns to normal operation automatically when the vehicle speed reaches the specification, even if the TCS control is inhibited by the TCS OFF switch.
Block Diagram
