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:
Oct. 06, 1992
Filed:
Jun. 28, 1991
James A Bright, Dayton, OH (US);
David A Stradling, Troy, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An anti-lock braking system (ABS) for a vehicle is provided which in a preferred embodiment includes a controller for signalling the system to an ABS mode, a master cylinder for supplying fluid, an actuator having a bore with a first port connecting the bore with the master cylinder and a second port spaced from the first port connecting the bore with a brake, a first check valve separating the bore into a first chamber exposed to the first port and a second chamber exposed to the second port, and an orifice restricting flow between the brake and the master cylinder via the first and second chambers. A piston is mounted in the second chamber, the piston in a fully actuated position open the first check valve. A threaded driver translates the piston and is powered by a motor. A parallel path connects the master cylinder with the brake parallel to the first and second chambers of the actuator. A solenoid valve within the parallel path is governed by the controller for isolating the master cylinder from the brake when the system is in an ABS mode of operation. A second check valve allows fluid flow from the brake to the master cylinder when pressure within the master cylinder is lower than pressure within the brake.