Throttle valve abnormality determination device

A throttle valve abnormality determination device comprising:

• a first temperature acquisition unit configured to acquire a first temperature that is a temperature in a passage through which intake air flows;
• a second temperature acquisition unit configured to acquire a second temperature that is a temperature in the passage;
• an air amount acquisition unit configured to acquire an intake air amount that is a mass flow rate of the intake air;
• and
• a permission/rejection determination unit configured to determine whether or not to permit a sticking determination of a throttle valve based on the first temperature, the second temperature, and the intake air amount, wherein
• the permission/rejection determination unit is configured to:
• prohibit the sticking determination if the first temperature is less than or equal to a freezing temperature at which the throttle valve may be frozen when an engine is started;
• and
• after prohibiting the sticking determination, permit the sticking determination if an integrated value of a heat amount conversion value based on the second temperature and the intake air amount exceeds a threshold value when the second temperature is greater than or equal to a de-freezing temperature at which a frozen portion of the throttle valve is de-frozen.