Brake system for vehicles with routine judgment of normal operation of pressure sensors

摘要

In a brake system of a vehicle in which a pair of wheel cylinders are supplied with a fluid pressure by a fluid circuit having a pair of inlet control valves for selectively connecting the pair of wheel cylinders respectively to an outlet port of a motor-driven pump and a pair of outlet control valves for selectively connecting the pair of wheel cylinders respectively to a fluid reservoir, a brake control device controls the motor driving of the pump and opening/closing of the inlet and outlet control valves, such that a controlled fluid pressure is supplied to the pair of wheel cylinders at least temporarily with the pair of inlet control valves substantially fully opened, while the pair of outlet control valves substantially closed, wherein it is judged if there is a difference between output signals of a pair of wheel cylinder pressure sensors beyond a predetermined threshold value, thereby judging the pair of wheel cylinder pressure sensors to be both operating normally when the difference is not larger than the threshold value.