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:
May. 07, 1991
Filed:
Jun. 29, 1990
Robert Mergenthaler, Markgroeningen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A system for feedback-free ABS control in hydraulic brakes for mobile units, motor vehicles, motorcycles, and the like, equipped with a pedal-actuated master brake cylinder with a hydraulic brake booster and at least one isolation or shutoff valve in the form of a 3/2-way magnetic valve, which in normal operation is supplied with pressure by the master brake cylinder booster and is also assigned a plunger-piston for performing an ABS control. A check valve is disposed in the connecting line between the isolation valve, the ABS magnetic valve and the plunger-piston, or in a common supply line from the dynamic circuit of the master brake cylinder to these three actuating elements, as additional protection for the isolation valve and to assure the required brake pressure, even in the case of a failure, to keep the chambers of the hydraulic isolation valve and the rear chamber of the plunger-piston under pressure and in this way arrest the pistons so that they cannot move during normal braking operation. A pressure control valve can be disposed parallel to the check valve to limit the pressure in case of expansion of the fluid in the chambers, for example, by heating.