| 摘要 |
A determining device for determining a failure in an engine cylinder of an internal combustion engine, comprising a variation detecting unit for sequentially detecting a variation in an engine speed between a first engine speed detected by an engine speed detecting unit during a combustion process at a first engine cylinder and a second engine speed detected by the engine speed detecting unit during a combustion process at a second engine cylinder immediately preceding the first engine cylinder with respect to an ignition sequence of all of the engine cylinders, a first determining unit for determining that a misfire has occurred when the variation in the engine speed detected by the variation detecting unit is larger than a predetermined first variation in the engine speed, a second determining unit for determining that a failure has occurred in an engine cylinder when a frequency at which the first determining unit determines that a misfire has occurred is larger than a predetermined frequency, and a value control unit for increasing at least one of the predetermined first variation in the engine speed and the predetermined frequency in accordance with an increase in the engine load detected by the engine load detecting unit.
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