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:
Feb. 02, 1993
Filed:
May. 20, 1991
Reinhard Gutzeit, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A hydraulic dual-circuit brake system for motor vehicles comprising an antilock system (ABS) and an anti-spin control system (ASR) a four-duct hydro unit with control valves and a return pump with two separate pump elements for each brake circuit. An active piston storage unit is provided to supply brake pressure during ASR operation and each brake circuit containing at least one drive wheel is separable from a main master brake cylinder by means of a stop valve. The piston storage unit replaces the usual storage chamber at the input of a dual pump element provided for the brake circuit of the drive wheels and is activated at the beginning of anti-spin operation and is thereby filled with brake fluid from the brake fluid container. The piston storage unit is then de-activated such that the storage spring becomes operative and brake fluid is supplied via the storage piston into the pump element connected to the piston storage unit.