Vehicle antiskid brake control system having means for adjusting a non-sensed wheel brake pressure relative to a sensed wheel brake pressure
First Claim
1. An antiskid brake control system for the fluid pressure operated brakes of a vehicle having at least a pair of axles with a wheel at each end thereof, said system comprising:
- (a) a storage tank normally charged with fluid pressure;
(b) a brake cylinder device for each wheel of the vehicle;
(c) a fluid pressure conduit extending from said tank to each said brake cylinder device;
(d) a brake valve device in said conduit for controlling the supply of fluid pressure from said tank to said brake cylinders and for controlling the release of said brake cylinder fluid pressure;
(e) sensor means for providing output signals in accordance with the dynamic behavior of but a single wheel of at least one axle;
(f) evaluation means for providing control signals in accordance with said output signals from said sensor means;
(g) control valve means for modulating the fluid pressure of each said brake cylinder device in response to said control signals in order to adjust the brake cylinder pressure at the respective wheels independently of said brake valve device;
wherein the improvement comprises,(h) delay means for varying the degree of fluid pressure adjustment by said control valve means at said brake cylinder device of one of said wheels of an axle relative to the other of said wheels of the same axle, such as to preclude the fluid pressure at the brake cylinder of a wheel without said sensor means from attaining a level corresponding to the fluid pressure level at the brake cylinder of a wheel having said sensor means.
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Accused Products
Abstract
An antiskid brake control system in which an electronic evaluation circuit subject to dynamic behavior signals produced by a wheel sensor associated with one wheel of an axle controls modulator valve device in the brake cylinder fluid pressure conduit to adjust the brake cylinder pressure at the sensed wheel as well as at the non-sensed wheel of the axle independently of an operator controlled brake valve device. There is provided in alternate arrangements of the invention an electrical delay element via which either the supply or exhaust valve comprising the modulator valve device associated with the non-sensed wheel is controlled so that the non-sensed wheel brake pressure development is inhibited relative to the sensed wheel brake pressure to provide better stability of the non-sensed wheel. Another arrangement provides an electrical delay element via which the exhaust valve comprising the modulator valve device of the sensed wheel is controlled so as to inhibit the exhaust of brake pressure therefrom while the non-sensed wheel brake pressure is reduced in the usual manner under control of the evaluation device when a wheel skid condition of the sensed wheel is detected. As an alternative to the electrical delay elements in these arrangements, there may be provided a fluid pressure flow restrictor in the appropriate brake cylinder conduit, with the direction of restricted flow being controlled by a one-way check valve.
16 Citations
19 Claims
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1. An antiskid brake control system for the fluid pressure operated brakes of a vehicle having at least a pair of axles with a wheel at each end thereof, said system comprising:
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(a) a storage tank normally charged with fluid pressure; (b) a brake cylinder device for each wheel of the vehicle; (c) a fluid pressure conduit extending from said tank to each said brake cylinder device; (d) a brake valve device in said conduit for controlling the supply of fluid pressure from said tank to said brake cylinders and for controlling the release of said brake cylinder fluid pressure; (e) sensor means for providing output signals in accordance with the dynamic behavior of but a single wheel of at least one axle; (f) evaluation means for providing control signals in accordance with said output signals from said sensor means; (g) control valve means for modulating the fluid pressure of each said brake cylinder device in response to said control signals in order to adjust the brake cylinder pressure at the respective wheels independently of said brake valve device; wherein the improvement comprises, (h) delay means for varying the degree of fluid pressure adjustment by said control valve means at said brake cylinder device of one of said wheels of an axle relative to the other of said wheels of the same axle, such as to preclude the fluid pressure at the brake cylinder of a wheel without said sensor means from attaining a level corresponding to the fluid pressure level at the brake cylinder of a wheel having said sensor means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification