| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable speed control device capable of preventing a push-up shock or the generation of a backlash hammering noise of backlash between gears in a geared shifting mechanism of an automatic transmission in the automatic transmission in which a first friction element of plural friction elements is connected by increase in operating oil pressure and in response to a pressure signal related to the operating oil pressure of the first friction element, in the lapse of a preset time, a second friction element is released by lowering of the operating oil pressure to perform shifting operation by switching engagement of the friction elements. SOLUTION: In the automatic transmission, in shifting operation by switching engagement of the friction elements, after the end of loss stroke of the first friction element is detected, the operating oil pressure related to the second friction element is lowered with a preset gradient, and the operating oil pressure related to the first friction element is increased with a designated gradient, the oil pressure in detecting the end of the loss stroke is set a little larger than the operating oil pressure at the end of the actual loss stroke.
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