Patent ID: 6386646
Filing Date: 2002-05-14
Classification: B60T

Abstract:
A hydraulic brake system adapted for performing active braking maneuvers, said system comprising:a main cylinder connected to a fluid reservoir; a precharging device connected to the main cylinder; at least one wheel brake connected to the main cylinder by a brake line; a recirculating pump having a suction side connected to the wheel brake by a first suction line, the suction side of the recirculating pump being at least temporarily connected to the main cylinder by a second suction line; and a hydraulically actuated on-off valve arranged in the second suction line between the main cylinder and the recirculating pump, the hydraulically actuated valve having an inlet chamber connected to the precharging device, and an outlet chamber connected to the suction side of the recirculating pump, wherein the outlet chamber has a large cross sectional area than the inlet chamber such that a fluid pressure in the inlet chamber and a fluid pressure in the outlet chamber is increased to a predetermined value when the hydraulically actuated on-off valve is open to cause the hydraulically actuated on-off valve to close, and wherein the fluid pressure in the outlet chamber continues to keep the hydraulically actuated on-off valve closed until the fluid pressure in the outlet chamber is decreased to the predetermined value to cause the hydraulically actuated on-off valve to open, and wherein the hydraulically actuated on-off valve prevents a precharging pressure for the recirculating pump from exceeding the predetermined value of the fluid pressure in the outlet chamber of the hydraulically actuated on-off valve, whereby the recirculating pump is subjected to less wear.