| 摘要 |
PURPOSE: To provide a variable speed control device capable of preventing the occurrence of a shock by suitably controlling the operating oil pressure of a friction element to end the shifting operation in an 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. CONSTITUTION: In the automatic transmission for conducting shifting operation by switching engagement of the friction elements, the time from the instant of starting the inertia phase of switch shifting is measured, and when the inertia phase is not ended within designated time, the operating oil pressure related to the first friction element is forcedly increased with a gentle gradient. |
