Control system of hydraulic construction machinery

Details Control system of hydraulic construction machinery Control system of hydraulic construction machinery

1986-12-29

1988-02-23

Look, Edward K.

Power plants

Pressure fluid source and motor

Having correlated or joint actuation of controller of input...

F16D 3102

Patent

active

047261862

ABSTRACT:
A control system of hydraulic construction machinery includes a prime mover, at least one variable displacement pump driven by the prime mover, at least one actuator hydraulically driven by the pump, maximum revolution number altering device for the prime mover, maximum displacment volume altering device for the pump and an information provider device for providing information on the operation mode of the actuator, whereby the maximum revolution number altering means and maximum displacement volume altering means are controlled by the information provider device to provide a maximum number of revolutions and a maximum displacement volume which suit the operation mode indicated by the output signal. A product of the maximum displacement volume and the number of revolutions becomes at a constant always at the same time when the maximum displacement volume of the pump is varied in response to an output signal of the information provider device, whereby a change in the quantity of pumped fluid can be avoided when the maximum displacement volume of the pump is altered.

REFERENCES:
patent: 3369360 (1968-02-01), DeBiasi
patent: 3579978 (1971-05-01), Stams
patent: 3724205 (1973-04-01), Hallberg

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