To provide an abnormality detection device capable of quickly detecting an abnormality of an intercooler without causing the addition of a sensor, the drop of drivability and the like.
In this abnormality detection device, an ECU 10 determines whether the difference Ti between a present intake air temperature Ti and a reference intake air temperature Ti0 is smaller than an abnormality determination threshold Tith or not in a step S13, determines whether a timer count TC counts up (in an embodiment, the passing of some seconds) in a step S14 when the judgment in the step S13 is Yes, namely, a sufficient change in a heat radiation quantity by the intercooler 4 by the start/stop of a radiator cooling fan 52 is not recognized, and executes a process in the abnormality determination of the intercooler 4 in a step S15 when the determination in the S14 is Yes.
GOSHIYO EISAKU
TSUDA MASAKI
KUROKAWA YOSHIKI
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