Tcs Control Outline; Block Diagram; Tcs Control Operation - Mazda RX-8 2004 Service Highlights

TCS CONTROL OUTLINE

• TCS control actuates torque reduction through throttle, fuel cut and ignition timing control, as well as using
brake control to control traction.
Note
• Brake control: Brake fluid pressure from the hydraulic unit to the slipping driving wheel is increased,
operating the brake and preventing drive wheel slip.
Features
• The left and right wheels are controlled at the same time by throttle, fuel cut and ignition timing 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 much stable vehicle control.

Block Diagram

ABS WHEEL-SPEED
SENSOR (LF)
ABS WHEEL-SPEED
SENSOR (RF)
ABS WHEEL-SPEED
SENSOR (LR)
ABS WHEEL-SPEED
SENSOR (RR)
STEERING ANGLE
SENSOR
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TCS CONTROL OPERATION

• TCS control detects a slipping drive wheel using the following signals, sends a torque reduction request signal
to the PCM and, at the same time, controls the solenoid valves and pump motor in the DSC HU/CM.
— Vehicle wheel speed signals from the front and rear ABS wheel-speed sensors
— Engine torque signal from the PCM
— Steering angle signal from the steering angle sensor
— Yaw rate and lateral-G signals from the combined sensor
— Fluid pressure signals from the brake fluid pressure sensors
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DYNAMIC STABILITY CONTROL
DSC HU/CM
CM
CPU
BRAKE FLUID
PRESSURE SENSOR
HU
CALIPER PISTON
SOLENOID
(LR)
VALVE
PUMP CALIPER PISTON
MOTOR (RR)
COMBINED
SENSOR
CHU041543750S07
04–15
PCM
CHU0415S009
CHU041543750S08
04–15–13