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:
Jan. 19, 1993
Filed:
Apr. 08, 1991
Lothar Kirstein, Ditzingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A hydraulic dual-circuit brake system with an anti-skid system (ABS) and traction control (ASR) for motor vehicles having a four-channel hydraulic unit with four control valves; a return pump with two separate pump elements for each brake circuit; and two-low-pressure reservoirs connected to the inlets of the pump elements. To supply brake pressure in the traction control mode, an additional hydraulic unit is used, which has a precharging pump for feeding brake fluid from a brake fluid tank into each brake circuit containing a driven wheel, and having a valve unit, which in traction control operation disconnects the pump element associated to a brake circuit having at least one driven wheel from the master brake cylinder on the outlet side. For the sake of improved dynamics during brake pressure buildup, a shutoff element, which in traction control operation disconnects the low-pressure reservoir from the precharging pump, is provided between the low-pressure reservoir and the associated pump element.