Misfire detection apparatus and misfire detection method for...

Details Misfire detection apparatus and misfire detection method for... Misfire detection apparatus and misfire detection method for...

2011-01-25

2011-01-25

Kirkland, III, Freddie (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Irregular combustion

C073S114020

Reexamination Certificate

active

07874203

ABSTRACT:
In a misfire detection apparatus and method that detects a misfire in an internal combustion engine with cylinders provided in a vehicle, it is determined that a misfire occurs in the engine, if a first condition and a second condition are satisfied; the first condition is a condition that a rotational speed of an output shaft of the engine decreases by an amount equal to or larger than a first change amount during a time period from a compression top dead center in a first cylinder to the compression top dead center in a second cylinder; and the second condition is a condition that the rotational speed of the output shaft increases by an amount equal to or larger than a second change amount during a time period from the compression top dead center in the second cylinder to the compression top dead center in a third cylinder.

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