Antilock Brakes / Traction Control Systems: Description and Operation

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM:

SYSTEM DIAGRAM


























SYSTEM DESCRIPTION

1. COMPONENTS AND FUNCTION









HINT: *: The "initialization of linear solenoid valve and calibration" must be performed when the skid control ECU, actuator, stroke sensor, yaw rate (deceleration) sensor, brake control power supply assembly, and steering sensor are replaced Initialization. It is necessary to perform zero point calibration of the yaw rate (deceleration) sensor Calibration.

2. OPERATION DESCRIPTION
(a) Electronically Controlled Brake:
The skid control ECU receives signals from the pedal stroke sensor, master cylinder sensor and wheel cylinder pressure sensor. Based on these signals, the skid control ECU calculates necessary braking force for each wheel. The necessary hydraulic pressure braking force signal is sent to the hybrid control ECU via CAN communication. The skid control ECU receives a braking force (regenerative braking force) signal from the hybrid control motor via CAN communication. The ECU calculates the necessary hydraulic pressure braking force based on the necessary braking force and regenerative braking force.
Necessary hydraulic pressure is supplied to each wheel by adjusting the brake accumulator (hydraulic pressure source) pressure with each solenoid valve.
If there is a problem with the braking function, the normally operating parts will maintain brake control as a fail-safe.





(b) ABS with EBD and Enhanced VSC:
The skid control ECU receives a vehicle speed signal from each speed sensor and detects wheel's slip condition and then sends a control signal to the solenoid.
The solenoid valve controls each wheel cylinder's hydraulic pressure and optimizes hydraulic pressure allocation to each wheel cylinder.





(c) BA (Brake Assist):
The skid control ECU receives the brake pedal stroke sensor signal and hydraulic pressure signal from the master cylinder pressure sensor and determines whether brake assist operation is necessary or not. If it is determined that brake assist operation is necessary, the ECU changes target hydraulic pressure applied to each wheel.