Mazda 3 Dynamic Stability Control DSC HU/CM
Using a compact and lightweight ruggedized DSC HU/CM integrated unit
The DSC HU/CM calculates the input signals from all sensors and controls the solenoid valve and the pump motor (on/off), regulates the pressure of the working fluid in the brake cylinders and activates the functions of the dynamic stability system (ABS, electronic brake force distribution (EBD) ), TCS, DSC and Brake Assist)
The design and operation of the DSC hydraulic unit is similar to that of the modern 323 (BJ) hydraulic unit, with the exception of the emergency brake booster.
The DSC HU/CM outputs the engine torque control signal and the vehicle speed signal via CAN.
The DSC HU/CM also outputs the vehicle speed signal by wire
Purpose and functions of the DSC system
DSC HU/CM
Calculates the input signal from each sensor, and controls the brake fluid pressure in the brake system of each wheel, activates each function of the DSC system (anti-lock brakes, EBD, TCS, and DSC)
Outputs a control signal that regulates the function of the TCS/DSC system and the speed signal via CAN
Outputs speed signal to audio unit, wiper and washer switch, car-navigation unit, cruise control actuator and wire alignment control unit
Controls the diagnostic system and the reliability system when faults are detected in the DSC system
PCM block
Controls motor torque based on signal from DSC HU/CM
Transmits engine status and wheel information to DSC HU/CM via CAN
DSC warning light
Notifies the driver that the DSC system is operating (vehicle is in side slip)
Notifies the driver of TCS (Drive Wheel Slip Situation)
DSC switch
Disabling the system at the request of the driver is transmitted to the DSC HU/CM
DSC shutdown warning light
Notifies the driver that the DSC DSC system has been deactivated
Notifies the driver that the DSC system has been disabled by Reliability Management
Wheel speed sensor
Detects the rotation status of each wheel and sends a signal to the DSC HU/CM
Combined sensor
Detects the lateral g-force and the yaw rate (corner rate) of the vehicle and transmits this information to the DSC HU/CM
Rotation angle sensor
Determines the angle of rotation and sends this information to the DSC HU/CM
DSC warning light operation
|
Element |
DSC warning light |
|---|---|
|
TCS,DCS not working |
Off |
|
TCS works |
Blinking (at 0.5s intervals) |
|
DSC works |
Blinking (at 0.5s intervals) |
DSC HU/CM Dynamic Stability Unit Functions
ABS control
When braking, it maintains the stability of the direction of movement, increases the reliability of control and ensures a shorter braking distance by controlling the pressure of the brake fluid
EBD (Electronic Brakeforce Distribution) control
Prevents rear wheel lockup by optimally distributing brake fluid pressure between the front and rear brakes according to vehicle load, road surface conditions and vehicle speed
TCS Management
Provides no Danger when starting off and accelerating by maintaining tractive effort within the limits allowed by the coefficient of adhesion, in accordance with road conditions and vehicle speed
DSC system control
Prevents vehicle oversteer or understeer by controlling engine torque and braking force at each wheel to ensure vehicle stability
Brake assist control
Controls the pressure of the working fluid in the caliper cylinders during emergency braking, provides increased fluid pressure in the cylinder of each wheel
Vehicle speed output
The result of the calculation from the signals of 4 wheel speed sensors is output as a speed signal to the CAN line, to the wiper and washer switch, cruise control system actuator, audio unit and wire alignment control unit