Patent · US Active

Method for determining the force conditions at the nozzle needle of a directly driven piezo injector

US9121378B2 · kind B2 · utility

3Cited by

10References

14Claims

0Family size

Assignee

CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

Michael D. Katzenberger · Florissant, US
Robert Hoffmann · Berlin, DE
Simon Ruscheinski · Rain, DE

Key dates

Filing date	Mar 8, 2012
Grant date	Sep 1, 2015
Priority date	—
Expiry date	Apr 15, 2032

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D2200/063
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A method is disclosed for determining the force acting on the nozzle needle of a directly driven piezo injector, in which an electrical voltage is built on the piezo actuator which drives the nozzle needle by means of a charging process. After the charging process has ended, the voltage at the piezo actuator is measured again. A voltage gradient is determined from consecutive voltage values. Conclusions of the force acting on the nozzle needle are drawn from the voltage gradients.

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