| 摘要 |
<p>An automatic transmission is provided having a friction element in which, when an ON pressure is supplied to a engaging-side oil chamber, a hydraulic piston is moved and engaged, a lock mechanism enters a lock state, while when an OFF pressure is supplied to a release-side oil chamber, the lock mechanism is released, and the hydraulic piston is moved and released, in which the OFF pressure is supplied to the release-side oil chamber again when a mode of the automatic transmission changes from a mode for engaging the friction element to a mode for releasing the friction element, and when the friction element is not released even if the OFF pressure is supplied to the release-side oil chamber.</p> |
