Patent ID: 8197131

Claim:
An abnormality determination apparatus for an oil temperature sensor used for detecting a temperature of a transmission oil of a transmission for a vehicle, said transmission being used for changing a rotational speed of a drive power source, said abnormality determination apparatus comprising: said oil temperature sensor; a first detection unit for detecting a vehicle state amount correlating with heat generation of said transmission; a second detection unit for detecting a vehicle state amount correlating with heat dissipation of said transmission oil; and a control unit connected to said oil temperature sensor, said first detection unit and said second detection unit, said control unit including: a first determination unit for performing a first determination process of determining whether or not said oil temperature sensor is abnormal, based on a result of comparison between a detected temperature detected by said oil temperature sensor and a predetermined temperature; a learning unit for learning about a correlation between a first heat dissipation amount of said transmission oil and said vehicle state amount correlating with heat dissipation when it is determined in said first determination process that said oil temperature sensor is normal, said learning unit calculating, when it is determined in said first determination process that said oil temperature sensor is normal, a heat generation amount of said transmission based on said vehicle state amount correlating with heat generation, and calculating said first heat dissipation amount based on said heat generation amount and said detected temperature; and an estimation unit for estimating a temperature of said transmission oil based on said heat generation amount and a second heat dissipation amount corresponding to said vehicle state amount correlating with heat dissipation, said estimation unit calculating said heat generation amount based on said vehicle state amount correlating with heat generation, and calculating said second heat dissipation amount using a result of learning by said learning unit.