SYSTEM AND METHOD FOR MAINTAINING CONSTANT LOADS IN HYDRAULIC SYSTEMS

A hydraulic system includes a pump (22) that draws fluid from a reservoir (24) and an actuator (26) having a first port and a second port. A metering valve arrangement (28) controls fluid flow through the actuator and includes a meter-in valve (30a, 30d) positioned between the pump and the first por...

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Bibliographische Detailangaben
1. Verfasser:	GEHLHOFF, WADE LEO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DREDGING FIXED CONSTRUCTIONS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS FOUNDATIONS HEATING HYDRAULIC ENGINEERING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SOIL SHIFTING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A hydraulic system includes a pump (22) that draws fluid from a reservoir (24) and an actuator (26) having a first port and a second port. A metering valve arrangement (28) controls fluid flow through the actuator and includes a meter-in valve (30a, 30d) positioned between the pump and the first port and a meter-out valve (30b, 30c) positioned between the second port and the reservoir. A controller (34) controls operation of the metering valve arrangement. In a meter-in mode, the controller controls a fluid flow rate through the actuator by controlling an orifice size of the meter-in valve. In a meter-out mode, the controller controls a fluid flow rate through the actuator by controlling an orifice size of the meter-out valve. The controller determines the fluid flow rate through the actuator based on data derived from the meter-out valve in both the meter-in mode and the meter-out mode.