Hydraulic control system for hydraulic working machine

Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Condition responsive means for modifying working member...

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60422, 91516, F15B 1116

Patent

active

058133119

ABSTRACT:
A controller 520 has a data portion 520c in which the relationship between a pump delivery pressure and a target opening area of a variable throttle 300a of a control valve 300 is set such that the target opening area is large when the pump delivery pressure is low, and small when the pump delivery pressure is high. An input portion 520a takes in a detection signal from a pump pressure sensor 700, a processing portion 520b reads the data from the data portion 520c and calculates a signal output to a solenoid proportional valve 590, and an output portion 520d converts the calculated signal into a command signal for the solenoid proportional valve 590 and outputs the command signal. Upon receiving the command signal from the controller 520, the solenoid proportional valve 590 produces a command pilot pressure for the control valve 300 corresponding to the input signal and controls the opening area of the variable throttle 300a.

REFERENCES:
patent: 3349670 (1967-10-01), Bahl et al.
patent: 3592216 (1971-07-01), McMillen
patent: 4385674 (1983-05-01), Presley
patent: 4768339 (1988-09-01), Aoyagi et al.
patent: 4977928 (1990-12-01), Smith et al.
patent: 5493950 (1996-02-01), Kim

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