Hydraulic control system having over-pressure protection

A hydraulic control system (150) for a machine (10) is disclosed. The hydraulic control system may have a tank (64), a pump (53) configured to draw fluid from the tank and pressurize the fluid, an actuator (49), and a control valve (63) configured to direct fluid from the pump to the actuator and fr...

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Bibliographische Detailangaben
Hauptverfasser:	EGELJA ALEKSANDAR M, PETERSON RANDAL N, CESUR RUSTU
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A hydraulic control system (150) for a machine (10) is disclosed. The hydraulic control system may have a tank (64), a pump (53) configured to draw fluid from the tank and pressurize the fluid, an actuator (49), and a control valve (63) configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The hydraulic system may also have a main relief valve (104) movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid directed to the actuator exceeds a first threshold pressure, and a controller (112) in communication with the pump. The controller may be configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid directed to the actuator exceeds a second threshold pressure.