| 摘要 |
Disclosed is an abnormality determination device capable of checking for abnormal particulate matter detection by a particulate matter detection sensor. The particulate matter detection sensor 10 includes a sensor element section 12, which comes into contact with particulate matter in exhaust gas in an exhaust pipe 6 of an internal combustion engine 2, and changes its output in accordance with the amount of particulate matter attached to the sensor element section 12. A heater for the particulate matter detection sensor 10 is capable of heating the sensor element section 12 to a particulate matter elimination temperature (T3) at which the particulate matter attached to the sensor element section 12 is eliminated from the sensor element section 12. An ECU 50 determines, in accordance with output changes (S1 to S4) occurring in the particulate matter detection sensor 10 during heater control, whether or not the particulate matter detection sensor 10 is abnormal.
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