초록 ▼

Automotive hydraulic pressure brake system with a stroke simulator is proposed which while the electric control system is functioning properly, the supply of hydraulic pressure from a master cylinder is cut off and hydraulic pressure is generated by a power pump. This improves response upon rapid pr

Automotive hydraulic pressure brake system with a stroke simulator is proposed which while the electric control system is functioning properly, the supply of hydraulic pressure from a master cylinder is cut off and hydraulic pressure is generated by a power pump. This improves response upon rapid pressure increase while minimizing the increase of pedal stroke and the worsening of the pedal feeling.A bypass is provided to communicate the master cylinder to the wheel cylinders while bypassing an on-off valve to be closed during ordinary braking. A shut-off valve is provided in the bypass and a check valve or a relief valve for allowing only a fluid flow from the master cylinder toward the wheel brake cylinders is provided.

대표청구항 ▼

1. An automotive hydraulic pressure brake system comprising a master cylinder for producing hydraulic pressure corresponding to a force applied to a brake pedal, a reservoir, wheel cylinders, a pump having a suction port connected to said reservoir through a first fluid line and an outlet port conne

1. An automotive hydraulic pressure brake system comprising a master cylinder for producing hydraulic pressure corresponding to a force applied to a brake pedal, a reservoir, wheel cylinders, a pump having a suction port connected to said reservoir through a first fluid line and an outlet port connected to said wheel cylinders through a second fluid line, an electric power source for supplying electric power to said pump, an on-off valve provided in a third fluid line connecting said master cylinder to said wheel cylinders, said second fluid line being connected to said third fluid line at a first point between said on-off valve and said wheel cylinders, a bypass line branching from said third fluid line at a second point between said master cylinder and said on-off valve and joining said second fluid line at a third point, a check valve or a relief valve provided in said bypass line for allowing only a fluid flow from said master cylinder toward said wheel cylinders, a shut-off valve provided in said bypass line in series with said check valve or relief valve, and an electronic control unit for keeping said on-off valve closed while said electric power source is functioning normally at least while the brake pedal is being depressed; and wherein said bypass line forms a fluid connection between said master cylinder and said wheel cylinders without passing through said pump.