| 摘要 |
<p>In a vehicle steering system, when a sensor malfunction determination unit (57) detects a malfunction of a rotation angle sensor (21), the sensor malfunction determination unit (57) changes a control mode from a first control mode to a second control mode. In the second control mode, an actual rotor angle (mechanical angle) (¸ SM ) of a steered system motor (3) is computed on the basis of a second rotor angle (electric angle) (¸ SE2 ) estimated by a rotation angle estimation unit (55). Then, feedback control is executed such that the actual rotor angle (¸ SM ) converges to a target rotor angle (¸ SM1 *) that is obtained by superimposing a rotation maintaining command signal on a target rotor angle (¸ SM *) computed by a target rotor angle computation unit (41).</p> |
