(19)
(11) EP 0 781 912 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.06.1999 Bulletin 1999/22

(43) Date of publication A2:
02.07.1997 Bulletin 1997/27

(21) Application number: 96120868.3

(22) Date of filing: 24.12.1996
(51) International Patent Classification (IPC)6: F02D 41/22, F02D 41/14
(84) Designated Contracting States:
DE FR GB

(30) Priority: 25.12.1995 JP 337348/95

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Aichi-ken (JP)

(72) Inventors:
  • Iwai, Akira
    Toyota-shi, Aichi-ken 473 (JP)
  • Ito, Yoshiyasu
    Toyota-shi, Aichi-ken 471 (JP)
  • Hidaka, Shigeki
    Kariya-shi, Aichi-ken 448 (JP)

(74) Representative: Grams, Klaus Dieter, Dipl.-Ing. 
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Postfach 20 19 18
80019 München
80019 München (DE)

   


(54) Apparatus for determining malfunctioning of fuel injection control system


(57) A system for detecting malfunctions in an apparatus for controlling a fuel injection mechanism of a diesel engine (2) provided with a plurality of cylinders (C) is disclosed. Each cylinder (C) accommodates a piston (42) for producing rotation of a crankshaft (40) and a nozzle (4) for performing fuel injection during each reciprocation cycle of the piston (42). Injection amount of the fuel is altered based on a compensation value computed for each cylinder (C) so as to minimize a value indicating cyclic rotating speed fluctuation of the crankshaft (40) produced by each cylinder (C). The system is characterized by memory means for storing an initial data indicative of the compensation value of each cylinder (C) computed during an initial injection stage of each nozzle (4), comparing means for comparing a malfunction judgement value with a magnitude obtained by computing the difference or ratio between an actual compensation value and the initial data, and determining means for determining the malfunctioning of the apparatus when the computed magnitude exceeds the predetermined range.






Search report