Method for obtaining a full range of lift speeds using a single input

摘要

A method for operating a work attachment of a work machine with a single input is disclosed. In one step of the method, an indication is received that operation of a work circuit in a hydraulic system is to be activated. Upon this indication, the hydraulic system may be placed in a work circuit primary mode in which a pump is placed in fluid communication with the work circuit. The method also includes receiving a lifting lever position and correlating the lifting lever position to a required lifting speed. The method further includes automatically controlling at least two of an engine speed, a pump displacement, and a lifting control valve to satisfy the required lifting speed. Additionally, the operation of the engine speed, pump displacement and lifting control valve may be sequentially staged in pre-defined zones of operation.

主权项

1. A method for operating a work attachment of a work machine with a single input, the method comprising:
(a) receiving a lifting lever position input and correlating the lifting lever position input to a required lifting speed; and (b) automatically controlling at least two of an engine speed, a pump displacement, and a lifting control valve to satisfy the required lifting speed, wherein the step of automatically controlling includes a first zone of control in which the lifting control valve is modulated to satisfy the required lifting speed while the engine speed is held at a constant minimum speed and the pump is held at a constant minimum displacement setting.