Brake control apparatus capable of traction control of vehicle drive wheel and having device for reducing delivery pressure of pump during the traction control

摘要

A control apparatus in a brake system of a motor vehicle having a wheel brake cylinder for braking a vehicle drive wheel, the apparatus including a pump for pressurizing a fluid received from a low- pressure source, a valve device having a pressure increase state for permitting the fluid pressurized by the pump to be fed into the wheel brake cylinder, and a pressure decrease state for permitting the fluid to be discharged from the wheel brake cylinder into the low-pressure source, a traction control device for selectively placing the valve device in at least the pressure increase and decrease states, to control the pressure of the fluid in the wheel brake cylinder for thereby controlling the drive force of the drive wheel so as to control the amount of slip of the drive wheel, and a pump delivery saving device for reducing the delivery pressure of the pump in at least a portion of a time period during which the valve device is placed in a state other than the pressure increase state.