Title:
燃料噴射システムおよび燃料噴射弁におけるニードル行程ストッパ到達を検出する方法
Document Type and Number:
Japanese Patent JP2010513768
Kind Code:
A
Abstract:
In fuel injection system having at least one fuel injector and a control unit for triggering the injector, each injector has a piezoelectric actuator, a nozzle element having at least one nozzle opening and at least one movable nozzle needle for selectively closing and opening the at least one nozzle opening, a hydraulic coupling element, which is connected between the piezoelectric actuator and the nozzle needle, and at least one stroke stop, against which the nozzle needle rests in its completely open and/or completely closed position. To be better able to ascertain when the stroke stop is reached in such injectors, the needle stroke stop is ascertained during an energization pause of the piezoelectric actuator by analyzing a voltage signal applied to the piezoelectric actuator. Oscillations of the voltage signal during the energization pause are preferably analyzed. To this end, regression lines are drawn through the voltage characteristic, a correlation coefficient of the regression lines to the voltage characteristic is ascertained and a needle stroke stop is detected on the basis of the correlation coefficient.
Inventors:
Andreas Lau
Oliver Becker
Eric Toner
Oliver Becker
Eric Toner
Application Number:
JP2009540695A
Publication Date:
April 30, 2010
Filing Date:
November 23, 2007
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
F02M51/00; F02M51/06; F02M65/00
Attorney, Agent or Firm:
Toshio Yano
Hiroshi Sugimoto
Takahashi
Hiroyasu Ninomiya
Einzel Felix-Reinhard
Hiroshi Sugimoto
Takahashi
Hiroyasu Ninomiya
Einzel Felix-Reinhard
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