Apparatus for detecting misfire in internal combustion engines f

Details Apparatus for detecting misfire in internal combustion engines f Apparatus for detecting misfire in internal combustion engines f

1991-10-31

1993-11-23

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

731173, 123481, F02D 3500

Patent

active

052634531

ABSTRACT:
An apparatus for detecting a misfire in an internal combustion engine for a vehicle includes a rotational speed change quantity computing unit which detects a rotational speed of the engine and computes a change quantity of the rotational speed of the engine, a misfire determination value correction coefficient setting unit which detects a load on the engine and sets a correction coefficient of a misfire determination value based on a result of detection of the engine load, a misfire determination value setting unit for setting a misfire determination value based on the set misfire determination value correction coefficient, and a misfire determining unit for determining whether a misfire has occurred in the engine by comparing the change quantity of the rotational speed of the engine from the rotational speed change quantity computing unit with the misfire determination value from the misfire determination value setting unit. The misfire detecting apparatus further includes a misfire detection result invalidating unit for invalidating a result of misfire determination by the misfire determining unit.

REFERENCES:
patent: 4366794 (1983-01-01), Hachiga et al.
patent: 5035220 (1991-07-01), Uchinami et al.
patent: 5044195 (1991-09-01), James et al.
patent: 5109695 (1992-05-01), James et al.
patent: 5158059 (1992-10-01), Kuroda
SAE 900232--Methods Of On-Board Misfire Detection--Gunter Plapp et al pp. 9-19, no date.

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