Drive for a working vehicle

摘要

The system has a main engine drivingly connected to a hydraulic pump having a displacement volume which is variable by a pump actuator. The hydraulic pump is drivingly connected to a hydraulic motor which is drivingly connected to a wheel engaging the ground. The hydraulic motor has a variable displacement volume by the actuator and the pump is also connected to a second hydraulic motor which is drivingly connected to a second wheel engaging the ground. The motor has a variable displacement volume by a second actuator. - A controller is coupled to a sensor configured to sense the position of a control lever for setting rotational speed of the wheels. The controller is configured to adjust actuators in response to movement of the control lever. The controller adjusts the first actuator to reduce the displacement volume of the first hydraulic motor and reduce the rotational speed of the first wheel when an undesirable operating condition is detected at the first wheel. The controller shifts the second actuator and the pump actuator to maintain a constant speed of travel by shifting the second actuator toward a greater displacement volume up to a maximum displacement volume and shifting the pump actuator toward a reduced displacement volume if the shifting of the second actuator is insufficient to compensate for the change in the displacement volume of the first hydraulic motor. An INDEPENDENT CLAIM is included for a harvester