| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electric power steering system in which, when steering wheel torque detection accuracy is lowered due to failure of some sensors of a plurality of sensors included in a steering wheel torque detection device, an electric motor is prevented from generating an auxiliary steering wheel torque the direction of which is opposite to the direction of the auxiliary steering wheel torque to be generated originally.SOLUTION: When the value of both of a second sensor failure flag Fand a fifth sensor failure flag Fis 2, a dead zone where a q-axis current command value Ibecomes zero is set for an area where an absolute value of a detected steering wheel torque Th is the supposed maximum torque error or less. When the value of either a second sensor failure flag For a fifth sensor failure flag Fis 2, the dead zone where the q-axis current command value Ibecomes zero is set for an area where an absolute value of the detected steering wheel torque Th is equal to or less than a half of the supposed maximum torque error.</p> |
