Patent ID: 6456065
Filing Date: 2002-09-24
Classification: B62D,G01D

Abstract:
A rotational angle detecting device, comprising:a rotor connected to a rotary member; a rotation detecting section for outputting a sinusoidal first detection signal and a sinusoidal second detection signal as a result of the rotation of the rotor, the first detection signal and the second detection signal having constant amplitudes, having the same periods, and having wavelengths which are out of phase with each other; a storage section for storing a most recently detected first detection signal and a most recently detected second detection signal; a controller; and a controlling section for receiving the first detection signal and the second detection signal from the rotation detecting section, for comparing the first detection signal and the second detection signal with the most recently detected first detection signal and the most recently detected second detection signal in the storage section, for updating the most recently detected first detection signal and the most recently detected second detection signal in the storage section, and for supplying the first detection signal and the second detection signal to the controller; wherein the controlling section compares the first detection signal and the second detection signal received from the rotation detecting section with the most recently received first detection signal and the most recently received second detection signal stored in the storage section, respectively, and determines whether the first and second detection signals fall within a proper range with respect to the most recently received first and second detection signals, and if so, then the controlling section supplies the first and second detection signals to the controller and updates the most recently received first and second detection signals in the storage section with the first and second detection signals, whereas, if the controlling section determines that the first and second detection signals fall outside the proper range with respect to the most recently received first and second detection signals, then the controlling section does not supply the first and second detection signals to the controller.