| 摘要 |
PURPOSE:To perform self-movement detection of a range change-over valve accurately at low cost by judging that the range change-over valve moves due to self-movement of a detent mechanism in accordance with deviation between an actual operation position of the range change-over valve and an estimated position when there is no amount of play in the detent mechanism. CONSTITUTION:A range change-over valve 30 is positioned at a plurality of range positions by drive controlling an actuator (motor) 50 electrically via a detent mechanism 34 provided with a predetermined amount of play. In this constitution, an actual operation position of the range change-over valve 30 is detected by a change-over valve operation position sensor 22. On the other hand, when the range change-over valve 30 is moved, an estimated position of the range change-over valve 30 when it is supposed that there is no amount of play in the detent mechanism 34 is computed by a range control section. It is judged that the range change-over valve 30 moves due to self-movement of the detent mechanism 34 in accordance with deviation between the actual operation position and the estimated position in the range change-over valve 30. Consequently, detection of self-movement is performed accurately at low cost. |
