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. 13, 1991
Filed:
Jun. 22, 1990
Roland Holzmann, Oettingen, DE;
Guenther Schmidt, Tamm-Hohenstange, DE;
Karl-Heinz Willmann, Freiberg/N, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A hydraulic brake system for a vehicle including, brake pressure modulators that prevent the locking of vehicle wheels caused by excessively high braking pressures. Such brake pressure modulators include brake line blocking valves and cylinders with pistons, where upon piston displacement, pressure fluid escapes from the wheel brakes to lower the brake pressure. The displacements of the pistons are controlled via valve assemblies that are connected to a servo pressure source. Failure of the servo pressure source, if there is even a small leak of a valve assembly, can lead to at least partial loss of a brake force during a braking event. To recognize and indicate any leak that might be present, a control unit which acts upon the valve assemblies is arranged such that it directs the valve assemblies into various switching positions and in this process, via a pressure sensor, observes whether logically observed pressures are varying impermissibly.