Alliedsignal Inc.

Seth C Ravndal

Daniel J Patient

A binary valve (40) for use in an anti-lock brake system having an electronic control unit (12) responsive to a wheel speed sensor (14) for optimizing the utilization of pressurized fluid to front (20,22) and rear (24,26) wheels during a brake application. The binary valve (40) is responsive to an input signal from the electronic control unit (12) derived by calculating when a complete stop (54) of a vehicle would occur and at approximately five seconds prior to such complete stop (54) decaying the fluid pressure supplied to the front (20,22) brakes to provide a transition (58) between the rate of deceleration (52) and a delayed complete stop location (56).

Front wheel pressure control when vehicle stopping is imminent

A brake system (10) comprising: a master cylinder (20) including a primary (24) and a secondary (26) chamber and a reservoir (26); an accumulator (40), a pump (42) having first inlet port connected to a reservoir (26) of the master cylinder (20) and the second outlet port (b) connected to the accumulator (40), a motor (50) for selectively driving the pump as a function of system pressure, a pressure boost mechanism (60) connected to the accumulator (40) and the primary and secondary chambers of the master cylinder for generating a boosted pressure at a fixed multiple of the pressure in either the primary or secondary master cylinder chambers.

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South Bend, IN, United States of America

Seth C Ravndal