Neutral point voltage regulator of torque sensor

Abstract

A neutral point voltage regulator of a torque sensor which has a pair of coils having inductances changing in opposite directions based on torques, and torque detecting means for outputting a torque detecting voltage Vt based on a voltage difference between a first voltage and a second voltage based on respective inductance changes of the pair of coils. The neutral point voltage regulator has an ideal temperature-characteristic storing means for storing a temperature characteristic of the torque detecting voltage Vt in neutral condition which is ideal temperature characteristic of which a reference neutral point voltage Vo corresponds to a reference temperature, temperature detecting means for detecting a temperature of the torque sensor, regulating voltage calculating means for calculating a neutral point regulating voltage ΔVo based on a measured torque detecting voltage Vp of the torque detecting means measured in neutral condition after assembly of the torque sensor, a detected temperature Tp detected by the temperature detecting means when measuring the torque detecting voltage, and the ideal temperature characteristic stored by the ideal temperature-characteristic storing means, and voltage regulating means for regulating the torque detecting voltage Vt of the torque detecting means based on the neutral point regulating voltage ΔVo calculated by the regulating voltage calculating means.