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:
Apr. 01, 2003
Filed:
Jan. 09, 1998
Andrew John Ward, Birmingham, GB;
David Charles Hurst, Solihull, GB;
Lucas Industries PLC, Solihull, GB;
Abstract
A rear axle braking system for a vehicle has a primary electronic braking circuit supplied with a source of primary braking pressure and a mechanical back-up braking circuit supplied with a source of back-up braking pressure. The braking actuator receives braking pressure and thereby brakes a wheel on a vehicle axle. During braking, a changeover valve is normally actuated to apply the primary braking pressure to the braking actuator. In the event of an electronic system failure, the changeover valve is not applied and instead the source of back-up braking pressure is supplied to the actuator. A regulating valve is located in the back-up braking circuit between the source and the changeover valve and is operable as a function of axle loading and back-up brake pressure to control the supply of back-up braking pressure to the changeover valve. The application of additional braking pressure to a wheel can be limited if the loading on the axle is likely to result in vehicle instability when braking.