Patent ID: 6704665
Filing Date: 2004-03-09
Classification: B62D,G01L

Abstract:
An abnormality detecting device of a torque sensor including a pair of coils in which inductance is changed in opposite directions corresponding to torque, and a torque detecting means for outputting a torque detection voltage from both voltages based on a change in inductance of each of the pair of the coils, the abnormality detecting device further comprising:a pair of filter circuits for extracting a DC component of each voltage based on the pair of the coils and change in each inductance; an operational amplifier for outputting a difference in voltage of the DC voltage outputted from each of the filter circuits as the abnormality detection voltage; a memory means for memorizing a normal tolerance range preliminarily set up about the abnormality detecting voltage of the operational amplifier; and a determining means for determining whether or not the abnormality detecting voltage outputted by the operational amplifier is the normal tolerance range memorized by the memory means wherein the operational amplifier is a differential amplifier in which any one of the both voltages is inputted to any one of an inversion input terminal and a non-inversion terminal of the differential amplifier and the other one of the both voltages is inputted to the other one, with negative feedback applied to an inversion input terminal and bias voltage applied to a non-inversion input terminal.