System for detecting misfire in a multi-cylinder internal combus

Details System for detecting misfire in a multi-cylinder internal combus System for detecting misfire in a multi-cylinder internal combus

1993-11-16

1996-07-23

Teska, Kevin J.

Boots, shoes, and leggings

36443107, 36443103, 36443101, 36443104, 731173, 731181, 73116, 123630, 123419, 123436, G06G 770, G01L 326, F02P 506

Patent

active

055396445

ABSTRACT:
A misfiring detecting system for an internal combustion engine includes a first misfire determination unit for comparing an engine rotational speed variation amount computed by an engine rotational speed variation amount computing unit, which computes a variation amount of the engine rotational speed, with a misfire determination value set by a misfire determination value setting unit and determines the occurrence of misfiring in the internal combustion engine on the basis of a result of the comparison, and a second misfire determination unit for determining the occurrence of misfiring in the internal combustion engine on the basis of: a result of comparison of a value indicative of a variation between engine rotational speed variation amounts computed by the engine rotational speed variation amount computing unit in the current and immediately preceding cycles, respectively, with a first set value; and a result of comparison of a value indicative of a variation of variation between engine rotational speed variation amounts computed by the engine rotational speed variation amount computing unit in the immediately preceding cycle and that of a two preceding cycle, respectively, with a second set value, so that misfiring can be accurately detected by preventing erroneous misfiring detection.

REFERENCES:
patent: 5050554 (1991-09-01), Ichikawa et al.
patent: 5197325 (1993-03-01), Tamura et al.
patent: 5263364 (1993-11-01), Nakayama et al.
patent: 5263453 (1993-11-01), Wakahara et al.
patent: 5268843 (1993-12-01), Imai
patent: 5287282 (1994-02-01), Imai
patent: 5287736 (1994-02-01), Nakayama et al.
patent: 5303158 (1994-04-01), Kuroda
patent: 5357790 (1994-10-01), Hosoya
patent: 5359882 (1994-11-01), Fukui

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