Patent · US Expired

Device for controlling gas exchange valves

US7089896B2 · kind B2 · utility

2Cited by

1References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Udo Diehl · Stuttgart, DE
Bernd Rosenau · Asperg, DE
Simon Kieser · Sachsenheim, DE

Key dates

Filing date	Jul 18, 2002
Grant date	Aug 15, 2006
Priority date	—
Expiry date	Sep 3, 2023

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01L2800/06
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A device for controlling gas exchange valves of an internal combustion engine, which has hydraulic valve positioners, each having a positioning piston acting on the gas exchange valve and two hydraulic working chambers, delimited by the positioning piston, of which the first working chamber, for closing the gas exchange valve, is continuously filled under fluid pressure and the second working chamber, for opening the gas exchange valve, is alternately filled and emptied with pressurized fluid via a first and second electrical control valve. To reduce the number of control valves, which may be necessary, for a valve pair, the filling of the second working chamber of the second valve positioner is performed via the second working chamber of the first valve positioner, which is connected to the first control valve, after a predetermined stroke of the positioning piston of the first valve positioner to open the assigned gas exchange valve.

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