Fluid-pressure and analogous brake systems – Speed-controlled – Pulse frequency or time period controlling pressure rebuild
Patent
1996-07-12
1997-07-01
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Pulse frequency or time period controlling pressure rebuild
303157, 303174, 303165, B60T 868
Patent
active
056429207
ABSTRACT:
A brake pressure controller, responsive to a wheel speed sensor and coupled to a brake, performs a cyclic control of pressure applied to the brake. A brake pressure cycle includes a pressure apply stage and a pressure dump stage having activation conditions based upon a slip threshold parameter. A predetermined base threshold quantity is modified in dependence upon a measured time duration of the pressure dump stage and/or a slip depth error quantity so that a greater amount of slip is added to the base slip threshold when braking on a deformable surface than when braking on a non-deformable surface.
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Johnson Bernard W.
Luckevich Mark
Negrin Dan
Butler Douglas C.
Kelsey-Hayes Co.
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