(19)
(11) EP 1 201 905 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.09.2003 Bulletin 2003/39

(43) Date of publication A2:
02.05.2002 Bulletin 2002/18

(21) Application number: 01125541.1

(22) Date of filing: 25.10.2001
(51) International Patent Classification (IPC)7: F02D 41/38, F02D 41/22
(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: 27.10.2000 JP 2000329448

(71) Applicants:
  • TOYOTA JIDOSHA KABUSHIKI KAISHA
    Aichi-ken 471-8571 (JP)
  • Denso Corporation
    Kariya-city, Aichi-pref., 448-8661 (JP)

(72) Inventors:
  • Murakami, Motoichi
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Sugiyama, Tatsumasa
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Takemoto, Eiji, c/o Intellectual Property Center
    Kariya-city, Aichi-pref., 448-8661 (JP)

(74) Representative: Leson, Thomas Johannes Alois, Dipl.-Ing. 
Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4
80336 München
80336 München (DE)

   


(54) A device for detecting failure in a high pressure fuel supply system


(57) Fuel of a high pressure is supplied from a high-pressure fuel injection pump 5 into a common-rail 3, and is, then, supplied to the fuel injection valves 1 from the common-rail. A control circuit (ECU) 20 compares a change in the fuel pressure in the common-rail detected by a fuel pressure sensor 31 during a judging period with an estimated value of change in the pressure during the judging period to judge the leakage of fuel from the common-rail. The judging period is set to take place in a period in which it is estimated that the fuel flows in the least amount into a pressure-accumulating chamber in the former half or in the latter half of the fuel supply stroke of the fuel pump. This minimizes the effect of fuel flowing into the common-rail, and improves the accuracy of leakage detection.






Search report