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:
Aug. 09, 2011
Filed:
Oct. 07, 2004
Frank Kaestner, Bietigheim-Bissingen, DE;
Thomas Bruex, Tuebingen, DE;
Andreas Grimm, Tiefenbronn-Muehlhausen, DE;
Otmar Bussmann, Abstatt, DE;
Frank Kaestner, Bietigheim-Bissingen, DE;
Thomas Bruex, Tuebingen, DE;
Andreas Grimm, Tiefenbronn-Muehlhausen, DE;
Otmar Bussmann, Abstatt, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for activating a two-stage switching valve including a first stage which has a small flow cross-section and a second stage which has a larger flow cross section, the switching valve being situated between a main brake cylinder and a hydraulic pump in a hydraulic brake system. The pressure equalization knock on opening the switching valve is substantially reduced by activating the switching valve in a first control phase via a control signal having a low amplitude, due to which only the first stage of the valve is first opened, and by activating the valve in a second phase via a control signal having a higher amplitude.