| 摘要 |
PURPOSE: To transmit proper driving force to a driving wheel by adjusting a transmission gear ratio of a continuously variable transmission in accordance with a power transmission shutoff continuity time and a car speed change amount when power transmission between an engine and the driving wheel is shut off. CONSTITUTION: A hydraulic continuously variable transmission TM comprises a constant discharge hydraulic pump P and a variable displacement hydraulic motor M connected to a closed circuit 21, the hydraulic pump P is connected to an input shaft 3 driven by an engine E, and the hydraulic motor M is connected to a rear wheel Wr through a chain 14, etc. Actuation of a displacement adjusting operation member 27 for the hydraulic motor M is controlled by an actuator 28 controlled by a control means C to change a rotation number ratio between the input shaft 3 and an output shaft, that is a transmission gear ratio. In this case, as a clutch valve 26 is opened, when the hydraulic pump P and the hydraulic moor M are power-shutoff state from each other, a transmission gear ratio is adjusted in accordance with power shutoff continuity time and car speed change amount. |
