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:
Jan. 31, 1984
Filed:
Mar. 26, 1982
Edward H Warwick, Englewood, OH (US);
Donald L Parker, Middletown, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A hybrid vehicle brake system with one set of brakes actuated by hydraulic pressure generated by a master cylinder in the usual manner, and a second set of hydraulically actuated wheel brakes controlled by brake effort demand as expressed by movement of the vehicle brake pedal by the vehicle operator to produce a brake demand signal independently of the master cylinder and the brake circuit for the first set of wheel brakes. The hydraulic pressure for the second brake set is maintained in an accumulator by a high and low pressure limit pump arrangement. When the stored brake pressure is required for brake actuation, it is directed through a variable valve arrangement to deliver the amount of actual brake actuating pressure needed at the second brake set to meet the operator's demand for braking effort. A control unit receives the brake demand signal as well as a signal indicating the actual brake actuating pressure sent to the second set of brakes. The control unit makes the brake supply pressure from the accumulator available and controls the variable valve arrangement to present the correct actual brake actuating pressure to the second brake set.