Importance

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Abstract

A cylinder identification apparatus for an internal combustion engine is able to inhibit erroneous operations caused by noise. The cylinder identification apparatus includes a crank angle sensor for detecting a rotational position of a crankshaft of the internal combustion engine having a plurality of cylinders, a cylinder identifier for identifying the respective cylinders based on a signal output from the crank angle sensor, an engine controller for controlling the internal combustion engine based on the result of cylinder identification carried out by the cylinder identifier, and a noise determiner for determining, before operational processing is implemented based on a particular angle signal, whether the particular angle signal among output signals from the crank angle sensor includes noise so that it inhibits subsequent operation processing if there is noise included in the particular angle signal. When the noise determiner receives a present particular angle signal, it effects noise determination on all angle signals from the last particular angle signal to the present particular angle signal at the same time, and it also compares the present angle signal cycle with the last normal angle signal cycle whenever it effects noise determination.

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First Claim