Patent · US Active

Method for activating a two-stage switching valve

US7992947B2 · kind B2 · utility

4Cited by

1References

6Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Frank Kaestner · Bietigheim-Bissingen, DE
Thomas Bruex · Sachsenheim, DE
Andreas Grimm · Bad Liebenzell, DE
Otmar Bussmann · Abstatt, DE

Key dates

Filing date	Oct 7, 2004
Grant date	Aug 9, 2011
Priority date	—
Expiry date	Dec 3, 2027

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60T8/5025
WIPO fieldTransport
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.