Patent · US Expired

Method and device for controllling an injector

US7406952B2 · kind B2 · utility

3Cited by

12References

20Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Joachim H. Frank · Lörrach, DE
Hellmut Freudenberg · Bad Abbach, DE
Manfred Weigl · Viehhausen, DE

Key dates

Filing date	Dec 2, 2005
Grant date	Aug 5, 2008
Priority date	—
Expiry date	Dec 2, 2025

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02M63/0026
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

An injector has a valve pin whose position is adjustable according to the pressure prevailing in a control chamber and which blocks a fluid flow through at least one injection port in a closed position. The injector has a control chamber that is hydraulically coupled to a high-pressure fluid reservoir, a piezo actuator, and a control valve which hydraulically connects and disconnects the control chamber, the piezo actuator acting upon said control valve. A combination of a triggering period for the piezo actuator and electric power that is to be fed to the piezo actuator is varied from a predefined initial combination to a target combination in which a pressure curve is detected that is characteristic of a movement of the control valve out of the closed position thereof without fluid being proportioned through the injection port.

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