Tcs Control Outline; Block Diagram; Tcs Control Operation - Mazda 2006 MX-5 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
COMBINED
SENSOR
HU
SOLENOID
VALVE
PUMP
MOTOR
BRAKE FLUID
PRESSURE
SENSOR
E5U041543750N07
CALIPER PISTON
(LR)
CALIPER PISTON
(RR)
PCM
E5U415ZS5010
E5U041543750N08
04–15–13
04–15