| 摘要 |
<p>An abnormality determination apparatus for a temperature detector is provided for improving the accuracy of abnormality determination. The temperature detector detects the temperature of exhaust gases emitted from an internal combustion engine to an exhaust system. The abnormality determination apparatus comprises an ECU for capturing the temperature of the exhaust gases at a location upstream of an exhaust gas purifying device provided in the exhaust system as an upstream temperature, and a downstream temperature sensor for detecting the temperature of the exhaust gases at a location downstream of the exhaust gas purifying device as a downstream temperature. The abnormality determination apparatus is characterized in that the ECU determines whether or not a supply of a fuel to the internal combustion engine is being stopped, estimates the downstream temperature in accordance with the captured upstream temperature, so as to increase a delay in change in temperature with respect to the upstream temperature when it is determined that fuel supply to the internal combustion engine is being stopped than when the fuel is being supplied, and determines an abnormality in at least one of the upstream temperature capturing means and the downstream temperature sensor in accordance with the result of a comparison between the estimated downstream temperature and the detected downstream temperature.</p> |
