Rsc Control Outline; Controller Area Network (Can) Outline; Data Sent; Data Received - Mazda CX-9 2007 Service Highlights

DYNAMIC STABILITY CONTROL/ROLL STABILITY CONTROL

RSC CONTROL OUTLINE

• The dynamic stability control (DSC)/roll stability control (RSC) system monitors the signal from the roll rate
sensor and each sensor, and calculates if the vehicle may be approaching a situation where rollover is
probable. When this occurs, the DSC/RSC system applies preemptive action. When the DSC/RSC system is
activated, it adjusts the braking force of specific wheels in response to the direct measurement of the vehicle
roll motion. By adjusting the brake force, the DSC/RSC system can reduce cornering forces, reducing the total
roll moment acting on the vehicle. The DSC/RSC system has the roll rate sensor located within the combined
sensor and an additional program within the DSC/RSC control module (CM) to support the vehicle control
during sudden steering operation. Information from the roll rate sensor is input into the DSC/RSC CM. The
computer uses information from the antilock brake system (ABS) wheel-speed sensor (wheel speed), throttle
position sensor (throttle valve opening angle), steering angle sensor (steering wheel angle, steering wheel rate
of change), and combined sensor (longitudinal-G, lateral-G, yaw rate, roll rate). If the DSC/RSC CM determines
from all these inputs that conditions exist for a potential rollover, the CM applies one or more brakes and
reduces the engine torque to make the vehicle more stable.
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CONTROLLER AREA NETWORK (CAN) OUTLINE

• The dynamic stability control (DSC)/roll stability control (RSC) hydraulic unit (HU)/control module (CM) sends
and receives data to and from other modules via the CAN system. Refer to Section 09 for a detailed
explanation of the controller area network (CAN) system.

Data sent

• Brake system status
• Wheel speeds of all four wheels
• Torque reduction request
• Desired coupling torque

Data received

• Engine speed
• Accelerator pedal position
• Engine torque
• Torque reduction disabled
• Target gear position/selector lever position
• Steering angle
• Steering angle sensor status
• Brake switch
• Brake fluid level
• Parking brake position
• AWD system status
• Coupling torque inhibit
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NG: FRONT ABS WHEEL-SPEED SENSOR

ABS WHEEL-SPEED SENSOR FUNCTION

• The Antilock brake system (ABS) wheel-speed sensor detects and transmits the rotation condition of each
wheel to the dynamic stability control (DSC)/roll stability control (RSC) hydraulic unit (HU)/control module (CM).
• The signal from the ABS wheel-speed sensors is the primary signal for DSC/RSC HU/CM control.
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