(19)
(11) EP 0 447 697 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.03.1992 Bulletin 1992/10

(43) Date of publication A2:
25.09.1991 Bulletin 1991/39

(21) Application number: 90250320.0

(22) Date of filing: 20.12.1990
(51) International Patent Classification (IPC)5: F02D 41/14, F02D 41/34
(84) Designated Contracting States:
CH DE DK LI

(30) Priority: 23.03.1990 JP 71954/90

(71) Applicant: MITSUBISHI JUKOGYO KABUSHIKI KAISHA
Tokyo 100 (JP)

(72) Inventors:
  • Nakano, Ryoji, Yokohama Dockyard & Machinery Works
    Naka-ku, Yokohama, Kanagawa Pref. (JP)
  • Mitsui, Shoji, c/o Yokohama Technical Inst.
    Naka-ku, Yokohama, Kanagawa Pref. (JP)
  • Tayama, Keijirou, c/o Mitsubishi Jukogyo
    Chiyoda-ku, Tokyo (JP)
  • Irie, Yasutaka Yokohama Dockyard & Mach. Works
    Naka-ku, Yokohama Kanagawa Pref. (JP)

(74) Representative: Meissner, Peter E., Dipl.-Ing. et al
Meissner & Meissner, Patentanwaltsbüro, Postfach 33 01 30
D-14171 Berlin
D-14171 Berlin (DE)


(56) References cited: : 
   
       


    (54) Apparatus for suppressing torsional vibration of a crank shaft of a diesel engine


    (57) A suppressing apparatus of torsional vibration of a crank shaft of a diesel engine can effect suppression of a resonant stress by only adjustment of a fuel injection system.
    The suppressing apparatus of torsional vibration of the crank shaft of the diesel engine adjusts a fuel injection timing and a fuel injection period (injection amount) for each cylinder in the vicinity of a resonant point of torsional vibration properly and varies a characteristic curve of pressure in the cylinder with respect to a crank angle to reduce the magnitude of harmonic components of resonance order of torque added to each cylinder, or adjusts phase differences of the harmonic components for each cylinder and suppresses the resonant stress so as to cancel external force for the vibration mode.






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