Method for controlling a pump and motor system

摘要

A method of controlling a pump and motor system having at least one of a variable displacement pump and a variable displacement motor. The method may comprise providing an engine drivingly coupled to a primary load and a secondary load, the secondary load being driven by the pump and motor system. The method may also comprise sensing a change in engine speed in response to a change in the primary load. The method may further comprise changing the engine speed to compensate for the primary load change. The method may further comprise changing a displacement of the at least one variable displacement pump and the variable displacement motor to maintain a constant secondary load.

主权项

1. A machine comprising:
an engine; a primary load drivingly coupled to the engine; a pump drivingly coupled to the engine, the pump operatively connected to a motor, at least one of the pump and the motor having a variable displacement; a secondary load, including a generator, drivingly coupled to the motor; a sensor configured to detect a speed change of the engine; a controller including control logic, being in communication with the sensor, the engine and at least one of the pump and the motor; the controller operating to receive input from the sensor of a sensed change in engine speed in response to a change in load of the primary load; the controller further configured to generate a signal to modify the engine speed in response to the sensed change in engine speed to compensate for the change in engine speed; and the controller further configured to generate a signal sent over a control line connection to change a displacement of the at least one of the pump and the motor to maintain a constant output to drive the secondary load in response to the sensed change in engine speed, wherein the sensor is separate from the controller.