Patent ID: 7573275

Claim:
A temperature sensor control apparatus comprising: a reference potential section set to a reference electric potential; a driving potential section set to a driving electric potential different from the reference electric potential; a temperature sensor configured to vary a resistance in accordance with a temperature of a fluid, and disposed between the reference potential section and the driving potential section for being energized; a conduction path extending from the driving potential section through the temperature sensor to the reference potential section; at least two reference resistance elements each disposed in the conduction path to be connected in series with the temperature sensor; a potential controlled point disposed in the conduction path between the reference resistance elements; a potential setting section configured to set an electric potential of the potential controlled point to the driving electric potential; and a resistance switching control section configured to control the potential setting section to switch the electric potential of the potential controlled point, and to switch each of the reference resistance elements to one of an energized state and a deenergized state.