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:
Jul. 11, 1989
Filed:
Jul. 18, 1988
Heinz Leiber, Oberriexingen, DE;
Reinhard Resch, Stuttgart, DE;
Daimler-Benz Aktiengesellschaft, Stuttgart, DE;
Abstract
In an antilocking braking system, a pressure modulator is provided for the control of pressure reduction and pressure build-up phases, wherein a drive pressure space of this modulator is placed under a pressure control to move a modulator piston into an end position associated with a minimum volume of a work chamber, which forms a section of the master brake line. In this end position, a spring-loaded inlet valve, connected between the work chamber of the pressure modulator and the brake booster of the brake system, is held in its open position by a tappet. As a result of pressure release in the drive pressure space, the modulator piston is displaced in the direction of its end position associated with a maximum volume of the work chamber, so that brake fluid can flow back into the work chamber from one or more wheel brakes connected to this work chamber. In order to provide functional reliability and protect against a malfunction of the modulator together with its auxiliary pressure source and/or its inlet valve, a bypass flow path is provided which is both parallel to the flow path leading from the work chamber of the pressure modulator to the wheel brakes, and which can be released and closed by a solenoid valve.