초록 ▼

A pressure difference is formed between a master cylinder pressure and a wheel cylinder pressure when a master cut-off valve closes a hydraulic path connecting a master cylinder and a wheel cylinder and a hydraulic pump supplies pressurized brake fluid to the wheel cylinder. After the pressure diffe

A pressure difference is formed between a master cylinder pressure and a wheel cylinder pressure when a master cut-off valve closes a hydraulic path connecting a master cylinder and a wheel cylinder and a hydraulic pump supplies pressurized brake fluid to the wheel cylinder. After the pressure difference has been formed, the master cut-off valve opens the hydraulic path so that the pressure difference is cancelled. As a result, pulsations in brake fluid pressure occurs in the hydraulic path. A failure of the master cut-off valve or the hydraulic pump is detected based on the pulsations in brake fluid pressure.

대표청구항 ▼

[ What is claimed is:] [1.] A brake control apparatus for a vehicle, comprising:a brake fluid pressure generating device which generates brake fluid pressure,a wheel braking force generating device which causes braking force to be generated at a wheel by using brake fluid pressure generated by said

[ What is claimed is:] [1.] A brake control apparatus for a vehicle, comprising:a brake fluid pressure generating device which generates brake fluid pressure,a wheel braking force generating device which causes braking force to be generated at a wheel by using brake fluid pressure generated by said brake fluid pressure generating device;a pressure difference generating device, disposed in a hydraulic path connecting said brake fluid pressure generating device and said wheel braking force generating device, which generates a pressure difference between brake fluid pressure on a side of said brake fluid pressure generating device and brake fluid pressure on a side of said wheel braking force generating device; anddetermining means for determining a failure of said pressure difference generating device based on pulsations in brake fluid pressure occurring when said pressure difference generating device is driven to cancel said pressure difference, whereinsaid pressure difference generating device includes a pressure amplifying device which generates brake fluid pressure greater than brake fluid pressure generated by said brake fluid pressure generating device and applies greater brake fluid pressure to said wheel braking force generating device; andsaid determining means drives said pressure difference generating device so that brake fluid having said higher brake fluid pressure flows toward said brake fluid pressure generating device, whereby said pulsations in brake fluid pressure are generated.