Title:
燃料噴射器制御方法
Document Type and Number:
Japanese Patent JP4991839
Kind Code:
B2
Abstract:
A control method for a fuel injector having a piezoelectric stack (14) which is charged by means of a charge current (I charge ) and discharged by means of a discharge current (I discharge ) comprises determining a required separation time (t demand ) between the end of an electrical on signal associated with a first injection event (IE1) and the beginning of an electrical on signal associated with a second injection event (IE2). The control method also comprises calculating an overlap time (t overlap ) between the required separation time (t demand ) and the time required to charge the piezoelectric stack (14) to a first reference level using the charge current; dividing the overlap time (t overlap ) into first and second time periods (t overlap_portion1, t overlap_portion2 ) as a function of the charge and discharge currents (I charge , I discharge ); applying the charge current (I charge ) to the piezoelectric stack (14) for a charge time (t charge ) calculated on the basis of the first time period of the overlap time (t overlap_portion1 ); and applying the discharge current (I discharge ) to the piezoelectric stack (14) for a discharge time (t discharge ) so as to discharge the stack (14) to a second reference level, wherein the discharge time is calculated on the basis of the second time period of the overlap time (t overlap_portion2 ). As a result, the first and second injection events (IE1, IE2) are merged in a merging pulse mode of operation.
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Inventors:
Walsh, joseph
Sykes, Martin
Griffin, Peter
Sykes, Martin
Griffin, Peter
Application Number:
JP2009504813A
Publication Date:
August 01, 2012
Filing Date:
April 12, 2007
Export Citation:
Assignee:
Daimler AG
International Classes:
F02D41/38; F02D41/20; F02M45/02; F02M51/00; F02M51/06
Domestic Patent References:
| JP2001241350A |
Attorney, Agent or Firm:
Shinjiro Ono
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fumitoshi Nishiyama
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fumitoshi Nishiyama