AUTOMATIC TRANSMISSION AND CONTROLLING METHOD OF AUTOMATIC TRANSMISSION
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Sep 20, 2013
filing date -
Sep 26, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
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.
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