Measuring and testing – Test stand – For engine
Patent
1995-07-11
1997-04-29
Wieder, Kenneth A.
Measuring and testing
Test stand
For engine
324391, 324392, 36443103, 123419, F02P 1700
Patent
active
056251432
ABSTRACT:
A misfire detector for an internal combustion engine is provided which, if any of a plurality of modification factors is replaced by a value out of the proper range, can prevent erroneous misfire detection from, continuing. The misfire detector comprises a period measurement unit of signals generated by a crank angle sensor, a modification factor calculating unit for, based on a ratio between the periods of the plurality of signals in a steady operating condition, calculating a plurality of modification factors used to modify errors in period values, a modification factor propriety determining unit for determining whether the plurality of modification factors calculated by the modification factor calculating unit are in the proper range or not, a period variation factor calculating unit for, based on the periods values and the modification factors which have been determined as being proper, calculating each period variation factor used to quantitize variations in the period, and a misfire determining unit for determining the occurrence of a misfire based on the period variation factor calculated by the period variation factor calculating unit.
REFERENCES:
patent: 5200899 (1993-04-01), Ribbens
patent: 5239473 (1993-08-01), Ribbens
patent: 5258753 (1993-11-01), Jonker
Mitsubishi Denki & Kabushiki Kaisha
Solis Jose M.
Wieder Kenneth A.
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