Malfunction diagnosis apparatus for internal combustion engine

Details Malfunction diagnosis apparatus for internal combustion engine Malfunction diagnosis apparatus for internal combustion engine

1994-09-08

1996-09-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

055579337

ABSTRACT:
Provided is an internal combustion engine malfunction diagnosis apparatus capable of diagnosing the deterioration of an internal combustion engine with a high accuracy and capable of diagnosing deterioration of a fluctuation factor detection section of the engine with a high accuracy in irrespective of the engine speed.
According to one embodiment of the present invention, there is provided a malfunction diagnosis apparatus for an internal combustion engine comprises: a crank angle detection sensor for detecting a crank angle of the internal combustion engine; a fluctuation factor measurement means for measuring a state of a fluctuation factor of the internal combustion engine; an angular-based data sampling section for sampling data of an output signal from the fluctuation factor measurement means at a predetermined rotation angle of a crank shaft in accordance with a crank angle signal from the crank angle detection sensor; a malfunction judgement section for judging a malfunction of the internal combustion engine on the basis of data sampled by the angular-based data sampling section; a time-based data sampling section for sampling an output signal from the fluctuation factor measurement means at every lapse of a predetermined constant time; and a fluctuation factor measurement means deterioration judgement section for judging deterioration of the fluctuation factor measurement means on the basis of data sampled by the time-based data sampling section.

REFERENCES:
patent: 5134847 (1992-04-01), Ogawa
patent: 5138874 (1992-08-01), Davis
patent: 5158059 (1992-10-01), Kuroda
patent: 5237818 (1993-08-01), Ishii
patent: 5305635 (1994-04-01), James
patent: 5335539 (1994-08-01), Sweppy
patent: 5341642 (1994-08-01), Kurihara
patent: 5394744 (1995-03-01), James

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