HYDRAULIC SYSTEM WITH FLUID FLOW SUMMATION CONTROL OF A VARIABLE DISPLACEMENT PUMP AND PRIORITY ALLOCATION OF FLUID FLOW

WIPO Patent Application WO/2013/096300

A3

A system (20) has a variable displacement pump (50) that supplies pressurized fluid to power a plurality of hydraulic functions (31-36). Each hydraulic function has a control valve (51-56) with a variable source orifice (64) controlling fluid flow between the pump and a flow summation node (74), and a variable metering orifice (75) controlling fluid flow between the flow summation node and a hydraulic actuator (21-26). Variable bypass orifices (8a- 8f) in the control valves are connected in series between the flow summation node and a tank (48). As the metering orifice in a control valve enlarges, the source orifice enlarges and the bypass orifice shrinks. This alters pressure at the flow summation node, which is used to control the output of the pump. Components are provided to give selected hydraulic functions different levels of priority with respect to consuming fluid flow from the pump.

WO/2009/015502	CONTROL DEVICE FOR AT LEAST TWO HYDRAULIC DRIVES
JPH0772427	[Title of Invention] Hydraulic circuit of hydraulic shovel

STARKEY JONATHAN M (GB)
QUINNELL COREY K (US)
PIEPER GARY J (US)
BALLWEG JACOB (US)
HAMKINS ERIC P (US)

PCT/US2012/070327

August 15, 2013

December 18, 2012

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HUSCO INT INC (US)
STARKEY JONATHAN M (GB)
QUINNELL COREY K (US)
PIEPER GARY J (US)
BALLWEG JACOB (US)
HAMKINS ERIC P (US)

F15B11/16; F15B11/17

WO2012125794A1

2012-09-20

HAAS, George, E. (411 East Wisconsin AvenueMilwaukee, WI, US)

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