Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1987-02-12
1988-09-27
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91459, 414700, 414708, F15B 1316
Patent
active
047733020
ABSTRACT:
A control apparatus having a boom control system for controlling the movement of a liftable boom supported by a vehicle body and a working device control system for controlling a working device pivoted to the boom. Each of the control system includes a proportional solenoid valve and comprises an instruction circuit for producing an instruction signal in accordance with the amount of manipulation of an operating lever, discriminating circuit for determining the direction of operation of the valve from the instruction signal, a reference signal generator, a comparison circuit for comparing the instruction signal with the reference signal from the generator to obtain a pulse signal of a width in proportion to the amount of manipulation, and drive circuit for converting the pulse signal into a current to drive the valve in the direction determined by the discriminating circuit. The boom, as well as the working device, is movable at a speed corresponding to the amount of manipulation of the operating lever.
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patent: 4587883 (1986-05-01), Ehrentraut et al.
patent: 4625622 (1986-12-01), Gunda et al.
patent: 4643074 (1987-02-01), Gunda et al.
Harada Eriya
Mizota Hideaki
Kubota Ltd.
Look Edward K.
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