Braking force holding device for vehicle

TLDR: In this paper, the solenoid valves are provided in brake hydraulic passages 74, 75 joining a master cylinder to wheel cylinders, namely, a plurality of calipers 76, 76.

Abstract: PROBLEM TO BE SOLVED: To hold braking force for preventing the movement of a vehicle in stopping the vehicle and solve problems with abnormal noises to be generated when reducing the held braking force in starting the vehicle. SOLUTION: Solenoid valves 80, 90 are provided in brake hydraulic passages 74, 75 joining a master cylinder to wheel cylinders, namely, a plurality of calipers 76, 76. The solenoid valves 80, 90 are put into closed conditions at stopping the vehicle 1 to hold the braking force in the brake hydraulic pressure passages 74, 75 on the sides of the wheel cylinders for preventing the movement of the vehicle 1. On the other hand, when the solenoid valves 80, 90 are put into opened conditions at starting the vehicle 1 to reduce the held braking force, controlled variables for the solenoid valves 80, 90 are preset at values allowable for suppressing the movement of the vehicle 1 with creeping force at starting the stop of the vehicle 1 so that braking pressure reduced with the braking pressure releasing operation of a driver is not braking pressure or lower allowable for suppressing the movement of the vehicle 1 with the creeping force. Thus, unpleasant abnormal noises are suppressed or avoided, which are possibly generated in the vehicle constructed to be kept from movement even during unexpectedly slacking braking operation of the driver when reducing the braking force being held at the time of starting the vehicle. COPYRIGHT: (C)2004,JPO&NCIPI