Patent ID: 6778939
Filing Date: 2004-08-17
Classification: B62D,G01D

Abstract:
A rotational angle detector comprising:a rotational angle detecting section that detects an angle detection signal correspondent to a rotational state of a rotor in a short cycle and feeds the angle detection signal to a control section; the control section that calculates the angle detection signal fed from the rotational angle detecting section and sends an angle set signal through a controller to a controlled system; and a memory that stores the angle detection signal temporarily and also stores an allowable maximum angle value of the angle detection system, wherein the control section makes an output cycle for the angle set signal longer than a detection cycle for the angle detection signal and counts a number of times when the detection angle signal as fed within a long output cycle for the angle detection signal is beyond the allowable maximum angle value and, if the count is judged as being beyond a preset number, outputs an abnormality signal instead of the angle set signal.