Motors: expansible chamber type – With motive fluid valve – Electrically operated
Patent
1988-03-25
1989-11-21
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Electrically operated
60427, 60484, 91461, F15B 13044
Patent
active
048814504
ABSTRACT:
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.
REFERENCES:
patent: 3818926 (1974-06-01), Wohlwend
patent: 4475442 (1984-10-01), Breeden
patent: 4516469 (1985-05-01), Sato et al.
patent: 4718329 (1988-01-01), Nakajima et al.
patent: 4759183 (1988-07-01), Kreth et al.
patent: 4763560 (1988-08-01), Sasaki
Haga Masakazu
Hirami Ichiro
Hirata Toichi
Yoshida Kuniaki
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
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