초록 ▼

In a brake by wire system, a linear differential pressure control valve is provided to control accurately wheel cylinder pressure. A brake fluid conduit extending from a reservoir is branched out into two conduits, each of which is transmitted to each of right and left wheel cylinders. A linear diff

In a brake by wire system, a linear differential pressure control valve is provided to control accurately wheel cylinder pressure. A brake fluid conduit extending from a reservoir is branched out into two conduits, each of which is transmitted to each of right and left wheel cylinders. A linear differential pressure control valve is disposed in the conduit and an another linear differential pressure control valve in each of the branched out conduits. Brake fluid sucked from the reservoir by a motor pump is discharged to each of the branched out conduits between the valve and the wheel cylinder. The two valves thus connected in series are operative step by step to control the wheel cylinder pressure in accordance with the current commanded in response to brake pedal depression. The former linear differential pressure control valve is energized at first at a normal braking operation and, therefor, the identical pressure is applied to both of the wheel cylinders so that the detected wheel cylinder pressure may be adjusted. Further, a hybrid system using the brake by wire and a conventional master cylinder is also provided.

대표청구항 ▼

[ What is claimed is:] [1.]1. A brake system for vehicles comprising:first and second brake fluid conduits,a reservoir connected to one side of each of said first and second brake fluid conduits for storing excess brake fluid coming through said first and second brake fluid conduits,a first wheel cy

[ What is claimed is:] [1.]1. A brake system for vehicles comprising:first and second brake fluid conduits,a reservoir connected to one side of each of said first and second brake fluid conduits for storing excess brake fluid coming through said first and second brake fluid conduits,a first wheel cylinder for producing braking force, which is connected to the other side of said first brake fluid conduit,a first linear differential pressure control valve normally at a flow-through position provided in said first brake fluid conduit, anda first electrically driven pump, which sucks brake fluid from said second brake fluid conduit extending to said reservoir and discharges brake fluid to a portion of said first brake fluid conduit between said first linear differential pressure control valve and said first wheel cylinder,wherein said first linear differential pressure control valve controls linearly the brake fluid flowing from a wheel cylinder side to a reservoir side so that the brake fluid pressure of said wheel cylinder side may be linearly variable and become higher than that of said reservoir side by the amount to be determined in accordance with a current commanded to said first linear differential pressure control valve.