| 摘要 |
PURPOSE:To permit to reduce the shock of speed change by a method wherein an initial hydraulic pressure upon changing speed is reduced from the initial hydraulic pressure by a given amount during using a cooling device to reduce the fluctuation of torque of an output shaft during using the cooling device. CONSTITUTION:During the operation of the cooling device, a correcting value is added to an initial duty rate while a solenoid valve is controlled by the initial duty rate in steps 7, 8, 9. The correcting value is determined so that the initial hydraulic pressure becomes lower than the initial hydraulic pressure obtained by a learning control upon the last 1-2 speed change before using the cooling device by a given amount. As a result, the speed change hydraulic pressure for a kickdown servo is controlled, the fluctuation of torque of speed change output shaft during operating the cooling device is not changed compared with the fluctuation during operating the cooling device and the shock of speed change may be reduced. |
