Misfire detection method based on fluctuation in crankshaft rota

Details Misfire detection method based on fluctuation in crankshaft rota Misfire detection method based on fluctuation in crankshaft rota

1994-02-02

1995-09-26

Chilcot, Jr., Richard E.

Measuring and testing

Test stand

For engine

731173, 123419, 123436, 36443108, G01M 1500, G01P 1500

Patent

active

054526043

ABSTRACT:
A misfire detection method based on fluctuation in crankshaft rotation, in which a time interval required for the crankshaft to rotate over an angle region associated with a cylinder checked for misfire is detected in response to pulses supplied from a crank angle sensor having vanes. Next, a deviation of the crankshaft angular acceleration D .omega..sub.n, calculated based on the thus detected time interval and corresponding to the cylinder checked for misfire, from the angular acceleration D .omega..sub.n-3, corresponding to a cylinder belonging to the cylinder group to which the cylinder checked for misfire belongs, is compared with a determination value, and an occurrence/absence of misfire is detected in accordance with a result of the comparison. By using the deviation between the angular acceleration values calculated based on the time intervals detected through the use of the same vane, the bad effect of structural errors of the vanes is canceled, to thereby prevent erroneous misfire detection caused by the vane errors.

REFERENCES:
patent: 4413508 (1983-11-01), Kawamura et al.
patent: 5237504 (1993-08-01), Holmes et al.
patent: 5245865 (1993-09-01), Kayanuma
patent: 5307670 (1994-05-01), Imai et al.
patent: 5331848 (1994-07-01), Nakagawa et al.

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