EP 1872008 B1 20090304 - FUEL-INJECTOR WITH TWO-STAGE OPENING
Title (en)
FUEL-INJECTOR WITH TWO-STAGE OPENING
Title (de)
ZWEISTUFIG ÖFFNENDER KRAFTSTOFFINJEKTOR
Title (fr)
INJECTEUR DE CARBURANT S'OUVRANT A DEUX NIVEAUX
Publication
Application
Priority
- EP 2006060514 W 20060307
- DE 102005016796 A 20050412
Abstract (en)
[origin: WO2006108741A1] The invention relates to a fuel injector (110), which has the advantages of a direct needle regulation by means of a piezoelectric actuator (150), without using an inverse needle regulation. To achieve this, the stroke of the fuel injector (110) is reversed by means of a two-stage pressure converter. If the piezoelectric actuator (150) is extended, a pressure p<SUB>2</SUB> in a second control chamber (192) is temporarily increased by means of a control piston (154). This pushes a converter piston (170) against a closing direction (134), which again increases the pressure p<SUB>2</SUB> of the hydraulic fluid in the second control chamber (192). The converter piston (170) carries an injection valve member (128) along with it during the upwards displacement by means of a mechanical stop (184) and an annular collar (186), thus initiating a first opening displacement of the injection valve member (128). In addition, a pressure p<SUB>1</SUB> in a first control chamber (166) is temporarily decreased by the displacement of the control piston (154) in the closing direction (134). The first control chamber (166) is linked to a rear chamber (178) of the injection valve member (128) via a pressure compensation channel (198). The pressure p<SUB>3</SUB> in the rear chamber (178) thus decreases, exerting an additional hydraulic force on the injection valve member (128), which causes the latter (128) to be raised again.
IPC 8 full level
F02M 51/06 (2006.01)
CPC (source: EP US)
F02M 51/0603 (2013.01 - EP US); F02M 2200/704 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 2006108741 A1 20061019; DE 102005016796 A1 20061019; DE 502006003015 D1 20090416; EP 1872008 A1 20080102; EP 1872008 B1 20090304; US 2008169357 A1 20080717
DOCDB simple family (application)
EP 2006060514 W 20060307; DE 102005016796 A 20050412; DE 502006003015 T 20060307; EP 06708665 A 20060307; US 90842406 A 20060307