Patent ID: 6394561
Filing Date: 2002-05-28
Classification: B60T

Abstract:
A brake system of a vehicle having a first pan of front wheels and a pair of rear wheels, comprising a brake pedal, a fluid reservoir, a motor-driven pump for pumping a fluid from the reservoir to an outlet port thereof, at least one pair of wheel cylinders for braking one of the front pair and the rear pair of wheels according to a supply of a fluid pressure thereto, a fluid circuit having a pair of inlet control valves for selectively connecting the pair of wheel cylinders respectively to the outlet port of the pump and a pair of outlet control valves for selectively connecting the pair of wheel cylinders respectively to the reservoir, brake control means for controlling a motor driving of the pump and opening/closing of the inlet and outlet control valves so as to supply a controlled fluid pressure to the pair of wheel cylinders, and pressure sensors including a pair of wheel cylinder pressure sensors for measuring fluid pressures of the pair of wheel cylinders, the brake control means comprising:means for repeatedly at least temporarily substantially fully opening the pair of inlet control valves while substantially closing the pair of outlet control valves for supplying the controlled fluid pressure to the pair of wheel cylinders during an operation of the vehicle; means for comparing output signals of the pair of wheel cylinder pressure sensors when the controlled fluid pressure is supplied thereto to judge if there is a first difference therebetween beyond a first predetermined threshold allowance value; and means for judging the pair of wheel cylinder pressure sensors to be all operating normally when the first difference is not larger than the first threshold allowance value.