| 摘要 |
PURPOSE:To obtain the superior speed change characteristic by controlling the set time according to the traveling state of a car by a control means for setting speed change. CONSTITUTION:When the temperature Tp of working oil is below a set temperature alpha, it is judged that the viscosity of working oil is high, the quantity of clearance is small, and the oil discharge characteristic of a lower-edge oil chamber 456 is deteriorated, and an inhibitor valve 442 prohibits the electric conduction of a solenoid valve S4 for a proper set time T11, and the urging hydraulic pressure for downwardly urging the inhibitor valve 442 is generated in the oil chamber 454 between a low-high selecting spool 441 and the inhibitor valve 442. Thus, the superior speed change characteristic permitting the speedy response for the switching of the valve can be obtained. |
