DSC CM PART FUNCTION

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• The DSC CM makes calculations using signals input from each sensor, outputs a brake fluid pressure control signal to the DSC HU to actuate DSC system functions and outputs an engine output control signal to the PCM.

• The DSC HU/CM controls the following functions:

Function Table

Function name

Contents

ABS control function

•  Controls brake fluid pressure when braking to maintain directional stability, ensure steerability and reduce stopping distance.

Electronic brakeforce distribution (EBD) control function

•  Constantly controls proper distribution of brake fluid pressure to the front and rear wheels according to vehicle load, road surface and vehicle speed conditions to prevent early lock-up of the rear wheels.

TCS control function

•  Controls traction to within the road surface friction limit and according to road and driving conditions to improve starting and acceleration performance, and safety.

DSC control function

•  Suppresses strong over-steer and under-steer tendencies when turning by controlling engine output and braking of each wheel to assure driving safety.

Brake assist control function

•  The brake pedal depression speed and force is calculated from the brake fluid pressure sensor signal, and if an emergency braking situation is determined, each solenoid valve, pump motor and pump is activated, the brakes are applied by adding a higher amount of hydraulic pressure than the normal specified amount (hydraulic pressure occurring from master cylinder).

Hill launch assist (HLA)^*

•  Operates the linear control solenoid valve in the DSC HU/CM, holds/reduces brake fluid pressure while the vehicle is stopped on a slope, and controls brake fluid pressure while accelerating from a standstill on a slope.

CAN communication function

•  Outputs the vehicle speed signal and DSC system warning control data via CAN lines.

On-board diagnostic system

•  A function that allows important parts of the DSC control system to perform self-diagnosis. In case a malfunction occurs, the warning lights illuminate to alert the driver, and at the same time a DTC is stored in the DSC HU/CM.

•  When a malfunction is determined as a result of the on-board diagnostic test, system control is suspended or limited to prevent any dangerous situation while driving.

Function name	Contents
ABS control function	• Controls brake fluid pressure when braking to maintain directional stability, ensure steerability and reduce stopping distance.
Electronic brakeforce distribution (EBD) control function	• Constantly controls proper distribution of brake fluid pressure to the front and rear wheels according to vehicle load, road surface and vehicle speed conditions to prevent early lock-up of the rear wheels.
TCS control function	• Controls traction to within the road surface friction limit and according to road and driving conditions to improve starting and acceleration performance, and safety.
DSC control function	• Suppresses strong over-steer and under-steer tendencies when turning by controlling engine output and braking of each wheel to assure driving safety.
Brake assist control function	• The brake pedal depression speed and force is calculated from the brake fluid pressure sensor signal, and if an emergency braking situation is determined, each solenoid valve, pump motor and pump is activated, the brakes are applied by adding a higher amount of hydraulic pressure than the normal specified amount (hydraulic pressure occurring from master cylinder).
Hill launch assist (HLA)^*	• Operates the linear control solenoid valve in the DSC HU/CM, holds/reduces brake fluid pressure while the vehicle is stopped on a slope, and controls brake fluid pressure while accelerating from a standstill on a slope.
CAN communication function	• Outputs the vehicle speed signal and DSC system warning control data via CAN lines.
On-board diagnostic system	• A function that allows important parts of the DSC control system to perform self-diagnosis. In case a malfunction occurs, the warning lights illuminate to alert the driver, and at the same time a DTC is stored in the DSC HU/CM. • When a malfunction is determined as a result of the on-board diagnostic test, system control is suspended or limited to prevent any dangerous situation while driving.

* :MTX vehicles

Block Diagram

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