Method for detecting misfires in an internal combustion engine

Details Method for detecting misfires in an internal combustion engine Method for detecting misfires in an internal combustion engine

1991-09-04

1992-09-08

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

F02P 514

Patent

active

051449277

ABSTRACT:
The invention is directed to a method for detecting misfires in an internal combustion engine having Z cylinders. A compression angular segment and an expansion angular segment are fixed for each cylinder (i) of the Z cylinders in accordance with an initial crankshaft angle and a crankshaft angle span corresponding to this cylinder so that, with a smooth running of the engine and referred to time, a compression time span TV(i) corresponding to said compression angular segment is essentially equal to an expansion time span TE(i) corresponding to said expansion angular segment, with the compression angular segment lying within that crankshaft angle span for the cylinder (i) in which the engine speed drops because of compression occurrences and with the expansion angular segment lying within that crankshaft angle span for the cylinder (i) in which the engine speed increases because of expansion occurrences; and, deviations between compression time span and expansion time span for at least one cylinder are used to detect misfires.

REFERENCES:
patent: 4971007 (1990-11-01), Gopp et al.
patent: 5050556 (1991-09-01), Williams et al.
patent: 5054448 (1991-10-01), Matsuoka et al.
patent: 5058552 (1991-10-01), Shimonura et al.

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