Hydraulic brake pressure control system

摘要

In a hydraulic brake pressure control system, a master cylinder generates a brake fluid pressure proportional to a brake pedal pressure and a high-pressure supply device generates an increased brake fluid pressure. A hydraulic circuit having a wheel cylinder device is capable of performing a master cylinder control to control a wheel cylinder pressure by using the pressure generated by the master cylinder, and capable of performing a brake-by-wire control to control the wheel cylinder pressure by using the pressure generated by the high-pressure supply device. The hydraulic brake pressure control system includes a master cut valve device which controls a flow of brake fluid from the master cylinder into the wheel cylinder device. A wheel cylinder sensor device outputs a signal indicative of the brake fluid pressure in the wheel cylinder device. A malfunction position/mode detecting unit detects a malfunction position and a malfunction mode in the hydraulic brake pressure control system based on the signal output by the wheel cylinder sensor device during the master cylinder control and the signal output by the wheel cylinder sensor device during the brake-by-wire control.