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:
Sep. 26, 1989
Filed:
Oct. 18, 1988
Hans-Christof Klein, Hattersheim, DE;
Alfred Teves GmbH, Frankfurt, DE;
Abstract
In a brake-slip-controlled automotive vehicle brake system, a pedal-operated master cylinder is provided which applies hydraulic fluid to the wheel brake circuits via at least one braking pressure modulator and via one electromagnetically operated closing valve at a time. The pressure modulator comprises a volume receiver and a pneumatic piston-and-cylinder arrangement acting on the volume receiver and connected with a vacuum source and a pressure source via a change-over valve actuated by a brake slip control circuit. Inserted into each hydraulic line between the master cylinder and the pressure modulator is an electromagnetically operated pilot valve having a normal operating position and a suction position. A traction slip control circuit switches the pilot valves over upon the occurrence of traction slip and ensures that the pressure modulator is reversed to the direction of increasing volume admission. Subsequently, the return spring, tensioned during this reversal, and the atmospheric pressure will, by a new reversal of the change-over valve, be made use of for a pressure build-up in the wheel brake cylinder of the wheel showing traction slip.