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US 4,637,664 AGranted
Anti-skid control apparatus for a vehicle braking system
AssigneeNippon A B S, Ltd.
InventorTetsuro Arikawa
Life of this patent
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AssigneeNippon A B S, Ltd.
InventorTetsuro Arikawa
Estimating the term…
In an anti-skid control apparatus for a vehicle braking system including a fluid pressure control valve device arranged between a master cylinder and a wheel cylinder of a brake for the wheel, the fluid pressure control valve device receiving control signals of a control unit measuring the skid condition of the wheel to control the brake fluid pressure to said wheel cylinder; a hydraulic reservoir which, when the brake fluid pressure to the wheel cylinder is decreased with control of the fluid pressure control valve device, reserves the brake fluid discharged through the fluid pressure control valve device from the wheel cylinder; a pressure fluid supply conduit connecting the master cylinder with said fluid pressure control valve device; and a fluid pump for returning the brake fluid from the hydraulic reservoir into the pressure fluid supply conduit; the fluid pressure control valve device is provided for a pair of front wheels, respectively, a valve apparatus receiving fluid pressure of wheel cylinders of the front wheels is arranged between the pair of front wheels and a pair of rear wheels, and when any one of the fluid pressure control valve devices starts to control, at least the fluid pressure of the one of the rear wheels, being at the same side as the one of the front wheels, the fluid pressure of the wheel cylinder of which is lower, is controlled in accordance with the lower one of the fluid pressures of the wheel cylinders of the front wheels by the valve apparatus.
In a skid control apparatus for a vehicle braking system of the type comprising a master cylinder and wheel cylinders associated with front and rear wheels, fluid pressure control valve means arranged between the master cylinder and wheel cylinders, a control unit adapted to sense skid conditions, hydraulic reservoir means, and fluid pump means, the improvement wherein a separate fluid pressure control valve means is provided for each one of a pair of front wheel cylinders, and a valve apparatus arranged between said pair of front wheel cylinders and the cylinders of a pair of rear wheels, said valve apparatus normally being open to fluid pressures applied to all said wheel cylinders through the respective fluid pressure control valve means, and wherein sensing of skid conditions at one front wheel cylinder operates the one fluid pressure control means associated with that front wheel cylinder to vary the fluid pressure to said one front wheel cylinder, and means including said valve apparatus connecting said one fluid pressure control means to one of said rear wheel cylinders to also vary the fluid pressure to said one rear wheel cylinder.
Dependencies are inferred from the claim text.