A LOAD SENSING HYDRAULIC SYSTEM FOR A WORKING MACHINE, AND A METHOD FOR CONTROLLING A LOAD SENSING HYDRAULIC SYSTEM

The invention relates to a hydraulic system (12) for a working machine (1). The hydraulic system (12) is a load sensing (LS) system and comprises a hydraulic actuator (18) for movement of an implement and a control valve (15) having an inlet valve (16a, 16b) and an outlet valve (17a, 17b) for contro...

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Bibliographische Detailangaben
1. Verfasser:	VIGHOLM, Bo
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 HAULING HEATING HOISTING HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDEDFOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCEDIRECTLY TO THE SURFACE OF A LOAD HYDRAULIC ENGINEERING HYDRAULICS OR PNEUMATICS IN GENERAL LIFTING LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS SOIL SHIFTING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to a hydraulic system (12) for a working machine (1). The hydraulic system (12) is a load sensing (LS) system and comprises a hydraulic actuator (18) for movement of an implement and a control valve (15) having an inlet valve (16a, 16b) and an outlet valve (17a, 17b) for controlling the flow of hydraulic fluid from a pump (13) to the hydraulic actuator (18) and for draining hydraulic fluid from the hydraulic actuator (18), respectively. The hydraulic system also comprises a means (44) for determining the load (19) on the hydraulic actuator (18). The hydraulic system (12) further comprises a valve (24) for disconnecting the flow of hydraulic fluid from the pump (13) to the hydraulic actuator (18), while allowing another flow of hydraulic fluid to the hydraulic actuator (18), provided that the determined load on the hydraulic actuator (18) exceeds a threshold value.