Front wheel pressure control when vehicle stopping is imminent
AssigneeAlliedSignal Inc.
InventorSeth C. Ravndal
Life of this patent
Estimating the term…
Abstract
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).
Claims10
In an anti-lock brake system having at least one wheel speed sensor that communicates information relative to the speed of a vehicle to an electronic control unit to optimize the communication of pressurized fluid from a source of pressurized fluid to front and rear wheel brakes of a vehicle to effect a brake application, the invention comprising;
- valve means connected to said source of pressurized fluid and electronic control unit for interrupting communication to said front wheel brakes when the vehicle speed as determined by a current deceleration of the vehicle indicates a complete stop would occur in less than five seconds and initiating communication between said front wheel brakes and a storage container to reduce the fluid pressure of the pressurized fluid supplied to said front brakes and provide a smooth transition deceleration and the complete stop.
In an anti-lock brake system having a first circuit connecting a first front wheel brake and a first rear wheel brake with a source of pressurized fluid and a second circuit connecting a second front wheel brake and a second rear wheel brake with said source of pressurized fluid, a wheel speed sensor for detecting a wheel speed of a vehicle, and an electronic control unit responsive to said wheel speed sensor for optimizing the communication of pressurized fluid to said first and second front wheel brakes and first and second rear wheel brakes to effect a brake application, the invention comprising:
- valve means connected to first and second circuits and said electronic control unit for interrupting communication of pressurized fluid to said first and second front wheel brakes when a deceleration of the vehicle indicates a complete stop would occur in less than five seconds and for initiating communication between said first and second front wheel brakes and a storage container to reduce the fluid pressure supplied to said first and second front wheel brakes and provide a smooth transition between the deceleration and complete stop.
Dependencies are inferred from the claim text.