Title:
INJECTOR WITH A DIRECTLY-ACTUATED COMPOUND NOZZLE NEEDLE FOR FUEL INJECTION IN AN INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2004/046540
Kind Code:
A1
Abstract:
A piezoelectric injector with a directly-actuated compound nozzle needle (5) for fuel injection in an internal combustion engine is disclosed. Both nozzle needles (15, 17) of the compound nozzle needle (5) are operated for opening the injection holes (16, 19) not as conventionally by means of a fuel pressure generated in the injector or by means of a servo valve, but rather directly by the piezoelectric actuator (3). The actuator (3) can thus advantageously directly control both nozzle needles (15, 17) by means of the amplitude of the control voltage applied thereto. In the inactive state, pressure springs (11; 20, 21) hold the injection holes (16, 19) of both stages closed.
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Inventors:
KLUEGL WENDELIN (DE)
SCHUERZ WILLIBALD (DE)
SENGHAAS CLEMENS (DE)
SCHUERZ WILLIBALD (DE)
SENGHAAS CLEMENS (DE)
Application Number:
PCT/DE2003/003850
Publication Date:
June 03, 2004
Filing Date:
November 20, 2003
Export Citation:
Assignee:
SIEMENS AG (DE)
KLUEGL WENDELIN (DE)
SCHUERZ WILLIBALD (DE)
SENGHAAS CLEMENS (DE)
KLUEGL WENDELIN (DE)
SCHUERZ WILLIBALD (DE)
SENGHAAS CLEMENS (DE)
International Classes:
F02M45/08; F02M47/04; F02M51/06; F02M61/16; F02M63/00; (IPC1-7): F02M51/06; F02M45/08; F02M61/16
Foreign References:
| US20020166542A1 | 2002-11-14 | |||
| DE2710138A1 | 1978-09-14 | |||
| DE19642441A1 | 1998-04-16 | |||
| EP1079099A2 | 2001-02-28 | |||
| US4022166A | 1977-05-10 | |||
| FR2787144A1 | 2000-06-16 | |||
| DE4228214A1 | 1993-04-01 | |||
| DE19952057A1 | 2001-05-03 | |||
| DE2710138A1 | 1978-09-14 |
Attorney, Agent or Firm:
SIEMENS AKTIENGESELLSCHAFT (München, DE)
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