The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1993
Filed:
Dec. 18, 1991
Jack R Phipps, Novi, MI (US);
AlliedSignal Inc., Morristown, NJ (US);
Abstract
A method of controlling the operation of a vehicle brake system, the brake system including a master cylinder controlled by the operator of the vehicle to vary applied brake pressure to various brake mechanisms during normal service brake operation and an antiskid brake subsystem, activated when one or more vehicle wheels are skidding, for controlling brake pressure in the various brake mechanisms to permit various wheels to operate in a nonskidding manner. The method comprising the steps of: 1) determining and storing a control relationship which relates changes in vehicle deceleration and changes in applied brake pressure, with none of the wheels of the vehicle skidding, 2) subsequently measuring at least two values (P.sub.1 P.sub.2) of applied brake pressure to determine changes in applied brake pressure .DELTA.P during a measurement interval and calculating the change in control deceleration .DELTA.D.sub.ci corresponding to the change .DELTA.P in applied brake pressure utilizing the control relationship; directly measuring actual vehicle deceleration D.sub.i ; determining a change in actual vehicle deceleration .DELTA.D.sub.i corresponding to the change in applied brake pressure; determining if the change in actual vehicle deceleration over the measurement interval is inconsistent with the change in control deceleration; and if such inconsistancy is determined, reducing applied brake pressure to a determinable first level sufficient to cause actual vehicle deceleration to approach the control deceleration resulting from the reduced brake pressure.