| 摘要 |
[Problem] To provide an electric power steering device of which reliability is increased by a redundant system, in which independent detection signals are compared and diagnosed while the detection signals are individually diagnosed, and which can continue functioning without adversely affecting reliability. [Solution] An electric power steering device for assist-controlling a steering system is provided with at least two, respectively independent torque sensors and angle sensors, and has a function of computing and utilizing steering angles from the torque sensors and the angle sensors, wherein the independent signals are compared and diagnosed while the individual signals are individually diagnosed. If abnormality is determined by the comparative diagnosis, the angle sensor signals are not used, while if it is determined that at least one of the individual diagnoses is abnormal, the angle sensor signals are handled as a downgrade. If two or more of the individual diagnoses are determined to be abnormal, the angle sensor signals are not used. |
