Patent ID: 6295746
Filing Date: 2001-10-02
Classification: E02F

Abstract:
An apparatus for controlling movement of a work implement of a work machine having a hydraulic pump and a hydraulic motor for actuating the work implement, comprising:a work implement positioning device movable by an operator for directing movement of the work implement in a manual mode;a manually actuatable control valve connected to the work implement positioning device and further being connected between the hydraulic pump and the hydraulic motor for controlling operation of the hydraulic motor in the manual mode;an electrically actuatable control valve connected between the hydraulic pump and the hydraulic motor for controlling operation of the hydraulic motor in an automatic mode;a position sensor connected to the work implement and being operable to generate a signal that is representative of the position of the work implement;an implement controller coupled to the electrically actuatable control valve and the position sensor for actuating the electrically actuatable control valve in the automatic mode, the implement controller being operable to maintain the automatic mode of the electrically actuatable control valve upon receipt of a signal from the position sensor that is indicative of movement of the work implement within a predetermined value; anda pressure sensing device operatively connected to the manually actuatable control valve and further being coupled to the implement controller, wherein the pressure sensing device is responsive to hydraulic pressure within the manually actuatable control valve resulting from movement of the work implement positioning device and operable to apply a signal to the implement controller for altering operation of the electrically actuatable control valve in the automatic mode.