| 摘要 |
A propulsion drive system is provided for a utility vehicle having an internal combustion engine, a hydraulic pump connected, so as to be driven by the internal combustion engine wherein the fluid displacement of the hydraulic pump can be varied by a first actuator. A hydraulic motor is connected by a line conducting hydraulic fluid to the hydraulic pump wherein the fluid displacement of the hydraulic motor can be varied by a second actuator and is connected so as to drive at least one propulsion device in engagement with the ground. A control arrangement is connected with a speed input arrangement. The control arrangement is operated so as to control the first actuator and the second actuator in such a way that the overall efficiency of the hydraulic pump and the hydraulic motor is at a maximum.
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