(19)
(11) EP 1 236 883 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.11.2003 Bulletin 2003/48

(43) Date of publication A2:
04.09.2002 Bulletin 2002/36

(21) Application number: 02251468.1

(22) Date of filing: 01.03.2002
(51) International Patent Classification (IPC)7: F02M 47/02, F02M 63/00
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 02.03.2001 GB 0105193

(71) Applicant: Delphi Technologies, Inc.
Troy, MI 48007 (US)

(72) Inventor:
  • Stringfellow, Christopher
    Sittingbourne, Kent ME10 4TY (GB)

(74) Representative: Keltie, David Arthur et al
David Keltie Associates Fleet Place House 2 Fleet Place
London EC4M 7ET
London EC4M 7ET (GB)

   


(54) Fuel system


(57) A fuel system comprising a fuel injector (10) having a delivery chamber (22) which is arranged to receive fuel from a source (34) of high pressure fuel and from which fuel is delivered to a combustion space upon initiation of injection, comprising first and second control chambers (26, 44) for receiving a control fluid, a three way control valve arrangement (32) which is operable to control fluid pressure within the first control chamber (26) so as to control fuel injection timing, and to control fluid pressure within the second chamber (44), and a shut-off valve arrangement (46) operable in response to fluid pressure variations within the second control chamber (44) so as to control the flow of fuel between the source (34) of high pressure fuel and the delivery chamber (22) of the injector. The three way control valve arrangement (32) is actuable between a first position in which the first control chamber (26) communicates with a source (34; 61) of control fluid at relatively high pressure and a second position in which the first control chamber (26) communicates with a low pressure control fluid reservoir (38; 60).
The invention provides the advantage that leakage of fuel into the engine cylinder or other combustion space of the associated engine is reduced as the flow of high pressure fuel into the delivery chamber (22) is terminated between successive injections of fuel.






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