Apparatus for detecting misfire in internal combustion engine

Details Apparatus for detecting misfire in internal combustion engine Apparatus for detecting misfire in internal combustion engine

1992-06-12

1994-01-04

Raevis, Robert

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

052750370

ABSTRACT:
A misfire detecting apparatus for an internal combustion engine which detects the occurrence of misfire in the engine on the basis of a rotation signal outputted in accordance with the rotation of the engine at every predetermined rotational angle a crank shaft of said engine. The apparatus successively calculates a time taken for revolution of the engine by a predetermined crank angle on the basis of the rotation signals outputted from the rotational angle sensor and then sets first and second decision values on the basis of the calculated times in connection with two cylinders of the engine which successively take explosion strokes. The second decision value is set at 360 degrees in the engine rotational angle previous to the setting of the first decision value. The apparatus detects the occurrence of misfire on the basis of the first and second decision values. This arrangement can accurately detect the occurrence of misfire irrespective of the difference in average speed between the respective cylinders.

REFERENCES:
patent: 3972230 (1976-08-01), Hanson et al.
patent: 4044235 (1977-08-01), Frobeaius
patent: 4298228 (1990-05-01), Fujimoto et al.
patent: 5041980 (1991-08-01), Maddock et al.
patent: 5095742 (1992-03-01), James et al.
patent: 5191788 (1993-03-01), Nishimura
"Methods of On-Board Misfire Detection" by Gunther Plapp et al.; SAE Paper No. 900232; Feb. 1990.

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