Description And Operation: Overview

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

The ABS control module is connected to the High Speed (HS) Controller Area Network (CAN) chassis bus and the Flexray circuit. 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:

ABS control module with integrated HCU.
All Terrain Progress Control (ATPC) switch
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

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 ABS control module receives vehicle acceleration data over a HS CAN chassis bus from the Restraints Control Module (RCM).

For additional information, refer to: AIR BAG AND SAFETY BELT PRETENSIONER SUPPLEMENTAL RESTRAINT SYSTEM (SRS) .

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

ABS
Roll Stability Control
Corner Brake Control (CBC)
DSC
Torque Vectoring by Braking (TVB) (if fitted)
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
HDC
Hill start assist
Terrain Response® system integration
Trailer stability assist.
All Terrain Progress Control (ATPC)

The HDC function is enabled either manually using the HDC switch, or automatically by the Terrain Response® system, in power mode 6 or 7. All Terrain Progress Control (ATPC) is enabled manually by the switch. All of the other brake functions are automatically enabled in power mode 6 or 7. The DSC function can be selected off using the DSC switch.