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AssigneeHitachi Construction Machinery Co., Ltd.
InventorsToichi Hirata, Masakazu Haga, Ichiro Hirami, Kuniaki Yoshida
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A drive control system, which is suitable for use in a hydraulic machine, is equipped with an electric lever device having a manipulation lever and a potentiometer for generating an electrical manipulation signal corresponding to the degree of each manipulation of the lever, a control valve connected to a hydraulic circuit adapted to actuate a hydraulic actuator, and a controller unit equipped with a main controller for receiving the manipulation signal and computing a control signal for the control valve on the basis of the manipulation signal and an output device for generating an electrical actuation signal corresponding to the control signal. The system also includes a neutral position sensing means provided with the electric lever device and adapted to sense a neutral position of the manipulation lever and an inhibition device which receives an output signal from the neutral position sensing means and when the manipulation lever is at the neutral position, inhibits the transmission of a signal between the main controller of the control means and the control valve.
A drive control system for a hydraulic machine, including an electric lever device equipped with a manipulation lever and a first output means for generating an electrical manipulation signal corresponding to the degree of each manipulation of the lever, a control valve connected to a hydraulic circuit adapted to actuate a hydraulic actuator, and a control means equipped with a main controller for receiving the manipulation signal and computing a control signal for the control valve on the basis of the manipulation signal and a second output means for generating an electrical actuation signal corresponding to the control signal, characterized in that said system additionally comprises a neutral position sensing means provided with the electric lever device for sensing a neutral position of the manipulation lever and an inhibition means which receives an output signal from the neutral position sensing means and when the manipulation ever is at the neutral position, inhibits the transmission of a signal between the main controller of the control means and the control valve.
Dependencies are inferred from the claim text.