DSC CM PART FUNCTION


BHE041543750T04

• 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.
EBD (Electronic Brakeforce Distribution) 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.
Vehicle speed output function
• Outputs the value calculated using the ABS wheel-speed sensor signals as vehicle speed signal to the audio unit, car-navigation unit and the auto leveling control unit.
• Transmits the wheel speed signal to the PCM using CAN communication.
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 diagnosis test, system control is suspended or limited to prevent any dangerous situation while driving.

Block Diagram

1
Input
2
CM internal calculation
3
Output
4
ABS wheel-speed sensor
5
Brake switch
6
Engine speed
7
Throttle opening angle
8
Output torque/torque reduction inhibited
9
DSC OFF switch
10
Steering angle sensor
11
Combined sensor
12
Yaw rate sensor
13
Lateral-G sensor
14
Brake fluid pressure sensor
15
Wheel-speed calculation
16
Estimated vehicle speed calculation
17
Brake operating condition determination
18
Engine speed calculation
19
Throttle opening angle data assimilated
20
Output torque/torque reduction inhibited data assimilated
21
DSC OFF requirement determined
22
Yaw rate calculation
23
Lateral-G calculation
24
Master cylinder fluid pressure calculation
25
ABS control amount
26
EBD control amount
27
TCS control amount
28
DSC control amount
29
Pump motor
30
Front solenoid valve
31
Rear solenoid valve
32
Traction switch valve
33
Stability control valve