Abstract Apparatus for controlling hydraulic brakes of a vehicle in which brakes are applied by hydraulic pressure in a conduit responsive to a depression of a brake pedal, the apparatus including an automatic two-way valve in the conduit for closing the conduit automatically to keep hydraulic pressure applied to the brakes after depression of the foot pedal and for opening to release the hydraulic pressure, and a control system for operating the automatic valve. The control system includes a first circuit having a speed responsive device, a second circuit having an accelerator responsive device, and a third circuit having a solenoid valve for operating the automatic two-way valve. When both the first and second circuits are opened by the speed responsive device and the accelerator responsive device, the solenoid valve is energized to close the automatic two-way valve for keeping the hydraulic pressure in the brake conduit applied to the brakes. The automatic two-way valve is preferably vacuum operated. It is bypassed by a check valve which allows increasing hydraulic pressure produced by the brake pedal to bypass the twoway valve so as to apply the brakes with greater force.
An apparatus for controlling hydraulic brakes of a vehicle in which brakes are applied by hydraulic pressure in a conduit responsive to depression of a brake pedal, said apparatus comprising the combination of automatic two-way valve means in said conduit for controlling the hydraulic pressure therein, electrical control means controlling the opening and closing of said two-way valve means, said electrical control means automatically closing said two-way valve means to keep hydraulic pressure in said conduit applied to the brakes after depression of said brake pedal and being operative to maintain said two-way valve means closed against increased hydraulic pressure in said conduit, selectively operable means for causing said electrical control means to open said two-way valve means following the latter''s automatic Closing by said electrical control means to release the hydraulic pressure in said conduit, and normallyclosed check valve means connected between opposite sides of said two-way valve means and operable automatically to open for allowing increasing hydraulic pressure in said conduit to bypass said two-way valve means to the brakes when said two-way valve means is kept closed by said electrical control means.
Claim 2
Independent Claim
185 words
An apparatus for controlling hydraulic brakes of a vehicle in which brakes are applied by hydraulic pressure in a conduit responsive to depression of a brake pedal, said apparatus comprising the combination of automatic two-way valve means in said conduit for controlling the hydraulic pressure therein, electrical control means controlling the opening and closing of said two-way valve means, said electrical control means automatically closing said two-way valve means to keep hydraulic pressure in said conduit applied to the brakes after depression of said brake pedal and being operative to maintain said two-way valve means closed against increased hydraulic pressure in said conduit, selectively operable means for causing said electrical control means to open said two-way valve means following the latter''s automatic Closing by said electrical control means to release the hydraulic pressure in said conduit, and normallyclosed check valve means connected between opposite sides of said two-way valve means and operable automatically to open for allowing increasing hydraulic pressure in said conduit to bypass said two-way valve means to the brakes when said two-way valve means is kept closed by said electrical control means.
Claim 3
Dependent Claim
41 words
Apparatus according to claim 1 on a vehicle having rear brakes and having a master cylinder operated by the brake pedal, wherein said two-way valve means and said check valve are both connected between said master cylinder and the rear brakes.
Claim 4
Dependent Claim
59 words
Apparatus according to claim 2, wherein said two-way valve means has a movable valve element and a valve seat engageable by said movable valve element and located between the latter and the rear brakes, and said check valve means has a movable valve element and a valve seat engageable thereby and located between the latter and the master cylinder.