ELECTRIC POWER STEERING DEVICE

摘要

To obtain an electric power steering apparatus in which, in the case where an abnormality is generated in an electric power steering apparatus body, an assist is reduced smaller than normal and a feeling of physical disorder that a driver feels can be reduced when it is estimated that a steering burden is small; and the assist can be increased equal to normal and the steering burden can be sufficiently reduced when it is estimated that the steering burden is large. In the case where the abnormality detection unit (26) detects an abnormality, an assist command at an abnormal time is set smaller than that at a normal time when there is no abnormality in a first range, where the steering burden estimated by the steering burden estimation unit (32) is small; the assist command at an abnormal time is increased equal to that at a normal time when there is no abnormality in a second range, where the steering burden estimated by the steering burden estimation unit (32) is larger than the first range; and an assist torque of a motor is controlled in response to the assist command at an abnormal time.