Patent ID: 6585332
Filing Date: 2003-07-01
Classification: B60T

Abstract:
A brake control device for a vehicle comprising:a master cylinder which generates a master cylinder hydraulic pressure in response to a depressing force applied to a brake pedal; a wheel cylinder connected with the master cylinder via a hydraulic conduit; a stroke simulator connected to an end of a branch hydraulic conduit branching from the hydraulic conduit; a first solenoid valve disposed at an intermediate portion of the hydraulic conduit between the wheel cylinder and a branch portion where the branch hydraulic conduit branches from the hydraulic conduit, the first solenoid valve alternatively connecting or disconnecting the master cylinder with the wheel cylinder; a second solenoid valve disposed at an intermediate portion of the branch hydraulic conduit and alternatively connecting or disconnecting the master cylinder with the stroke simulator; a pressure controlling mechanism having a pressure source and connected at an intermediate portion of the hydraulic circuit between the first solenoid valve and the wheel cylinder, the pressure controlling mechanism controlling hydraulic pressure to the wheel cylinder generated by the pressure source; control means for controlling the pressure controlling mechanism, the first solenoid valve and the second solenoid valve; the hydraulic pressure in the wheel cylinder being controlled by the master cylinder hydraulic pressure in response to the depressing force applied to the brake pedal in a state that the control means controls the first solenoid valve to be open and the second solenoid valve to be closed when the pressure controlling mechanism is in an abnormal condition; the hydraulic pressure in the wheel cylinder being controlled by the pressure controlling mechanism controlled by the control means in a state that the control means controls the first solenoid valve to be closed and the second solenoid valve to be open when the pressure controlling mechanism is in a normal condition and the master cylinder hydraulic pressure is lower than a predetermined level; the hydraulic pressure in the wheel cylinder being controlled by the pressure controlling mechanism controlled by the control means in a state that the control means controls the first solenoid valve to be closed and the second solenoid valve to be closed when the pressure controlling mechanism is in the normal condition and the master cylinder hydraulic pressure is equal to or greater than the predetermined level.