ABNORMALITY DIAGNOSIS METHOD FOR TORQUE DETECTION DEVICE, AND ELECTRIC POWER STEERING DEVICE

摘要

There is provided an abnormality diagnosing method for a torque detecting device, so as to provide a reliable torque detecting device, and an electric power steering device using the torque detecting device. Immediately after the power supply is turned on and before steering auxiliary control is started, the initial diagnosis is performed to determine that each monitoring unit (monitoring block) for monitoring an abnormality of a signal processing circuit (40) constituting a torque detecting device (30) operates normally. The initial diagnosis determines that a monitoring block is operating normally, by inputting a normal signal and an abnormal signal to the monitoring block alternately, and finding that the monitoring block carries out normal diagnosis when it receives the normal signal and that it carries out abnormal diagnosis when it receives the abnormal signal. Once all of the monitoring blocks are determined as normal, the steering auxiliary control based on a steering torque detected by the torque detecting device (30) is started.