Misfire judging device of internal combustion engine,...

Details Misfire judging device of internal combustion engine,... Misfire judging device of internal combustion engine,...

2006-12-14

2010-12-14

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Irregular combustion

Reexamination Certificate

active

07849733

ABSTRACT:
When an operating state constituted of a rotation speed Ne and torque Te of an engine belongs in a resonance region in a post-stage including a damper connected to a crankshaft of the engine, a subtraction sine wave for removing an influence by resonance is calculated, and misfire is judged depending on whether or not a variation amount ΔF of a rotation speed F after processing, obtained by subtracting the calculated subtraction sine wave from a variation in 30-degree rotation speed N30which is a rotation speed every time the crankshaft rotates by 30 degrees, is less than a threshold value Fref. Thereby, even when the operating state belongs in the resonance region, misfire can be judged more reliably and more accurately.

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Nov. 24, 2009 Search Report issued in European Patent Application No. EP 06834676.6.

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