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. 20, 1992
Filed:
May. 20, 1991
Lothar Kirstein, Ditzingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A hydraulic brake system with an anti-skid system (ABS) and traction control (ASR) for motor vehicles having a hydraulic unit with at least one control valve and a return pump with at least one pump element embodied as self-aspirating, which element is operative in the brake circuit containing the at least one driven wheel. To furnish brake pressure during traction control, a valve assembly is provided. For the sake of simplicity in the embodiment of this valve unit, it has not only a charge valve disposed in an intake line between the pump element and the brake fluid tank but also a reversing valve, incorporated between the master brake cylinder and the control valve and having three hydraulic control inlets and a restoring spring, of which one control inlet communicate with the outlet of the pump element, and the two control inlets counteracting this control element communicate with the valve inlet and outlet, respectively. A check valve having a parallel throttle provides for an adequate pressure difference for reversal of the reversing valve upon a buildup of pressure at the outlet of the pump element.