Braking Control System

The braking control system features an integrated four-channel Hydraulic Control Unit (HCU) and an Anti-lock Brake System (ABS) control module.

The ABS control module is connected to the FlexRay and High Speed (HS) Controller Area Network (CAN) chassis systems buses. The ABS control module actively interacts with other vehicle system control modules and associated sensors to receive and transmit current vehicle operating information.

When required, the ABS will actively intervene and operate the HCU during braking or vehicle maneuvers to correct the vehicle attitude, stability, traction or speed. During incidents of vehicle correction, the ABS control module may also request the Powertrain Control Module (PCM) to control engine power in order to further stabilize and correct the vehicle.

To provide full system functionality, the braking control system comprises the following components:

Anti-lock Brake System (ABS) control module with integrated HCU.
Dynamic Stability Control (DSC) switch
Hill Descent Control (HDC) switch
Four wheel speed sensors
Steering Angle Sensor Module (SASM) in the Steering Wheel Module
Brake pedal switch.
Instrument Cluster (IC) warning indicators
All Terrain Progress Control (ATPC) switch.

NOTE: Unlike some previous brake control systems, this system does not have a separate lateral acceleration and yaw rate sensor component to provide vehicle acceleration data. Instead, the Anti-lock Brake System control module receives vehicle acceleration data over a High Speed Controller Area Network chassis bus from the Restraints Control Module (RCM).

The braking control system provides the following brake functions that are designed to assist the vehicle or aid the driver:

ABS.
Anti-lock Brake System (ABS)
Roll Stability Control
Corner Brake Control (CBC)
Dynamic Stability Control (DSC)
Electronic Brake Force Distribution (EBD)
Electronic brake prefill
Electronic Traction Control (ETC)
Emergency Brake Assist (EBA)
Autonomous Emergency Braking (AEB)
Intelligent Emergency Braking (IEB)
Engine Drag-torque Control (EDC)
Enhanced Understeer Control
Gradient acceleration control
Gradient release control.
Terrain Response® system integration
Hill Descent Control (HDC)
Hill start assist.
Terrain Response® system integration
Trailer stability assist.

The HDC function is enabled either manually using the HDC switch, or automatically by the Terrain Response® system, in the ignition on and engine running power modes. All of the other brake functions are automatically enabled in the ignition on and engine running power modes. The DSC function can be selected off using the DSC switch.