Control apparatus and proportional solenoid valve control...

Details Control apparatus and proportional solenoid valve control... Control apparatus and proportional solenoid valve control...

F - Mech Eng,Light,Heat,Weapons

15

B

342/10, 342/38

F15B 13/16 (2006.01) E02F 3/43 (2006.01) E02F 9/20 (2006.01)

Patent

CA 1261944

ABSTRACT OF THE DISCLOSURE 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 insturction signal in accordance with the amount of manipulation of an operating lever, discrim- inating 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.

529489

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