Misfire detecting apparatus for internal combustion engine with

Details Misfire detecting apparatus for internal combustion engine with Misfire detecting apparatus for internal combustion engine with

1995-03-17

1996-06-25

Chilcot, Richard

Measuring and testing

Test stand

For engine

731173, 36443107, F02P 0100

Patent

active

055289290

ABSTRACT:
A misfire detecting apparatus for an internal combustion engine includes an angular position sensor 2,3 mounted on a crank shaft of the engine and composed of segments 12,13 defining angular intervals corresponding to reference positions for a plurality of cylinders of the engine, a period measuring circuit 6 for measuring periods of pulse signals SGT from the sensor, a correcting coefficient arithmetic circuit 7 for determining a plurality of correcting coefficients KL1,KL2 on the basis of the plurality of periods in a steady operation state of the engine, a period variation index arithmetic circuit 8 for arithmetically determining an index which quantifies variation of the period on the basis of the correcting coefficients and the periods, and a misfire decision circuit 9 for making decision as to occurrence of misfire in the engine on the basis of the period variation index. The correcting coefficient arithmetic circuit includes learning/updating arithmetic circuitry for updating the correcting coefficients the same number of times to respective latest values by learning.

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patent: 5307670 (1994-05-01), Imai et al.
patent: 5345817 (1994-09-01), Grenn et al.
patent: 5426587 (1995-06-01), Imai et al.

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