Abstract: A hydraulic system including a secondary pressure regulating transmission control system and a hydraulic power-supply system is provided. The secondary pressure regulating transmission control system includes a first hydraulic control system, a second hydraulic control system, and a third hydraulic control system. An integrated electro-hydraulic actuator of the first hydraulic control system is mounted on a first hydraulic cylinder, the integrated electro-hydraulic actuator of the second hydraulic control system is mounted on a second hydraulic cylinder, and the integrated electro-hydraulic actuator of the third hydraulic control system is mounted on a third hydraulic cylinder. The first hydraulic control system is configured to control a movable arm, the second hydraulic control system is configured to control a stick, and the third hydraulic control system is configured to control a bucket.

Abstract: Provided is a system for electro-hydraulic control of hydraulic pipeline rupture protection based on differential pressure feedback, which relates to the field of hydraulic control technology. The system comprises a hydraulic actuation system and a controller system. The controller system comprises a differential pressure feedback loop and a flow rate diagnostic loop. The differential pressure feedback loop is configured to obtain a flow rate signal within a hydraulic pipeline and determine a proportional signal. The flow rate diagnostic loop is configured to receive the proportional signal, and in response to determining that a duration for which the proportional signal remains outside a threshold range reaches a preset safety duration, cut off an actuating end of the hydraulic actuation system to achieve pipeline rupture protection.

Abstract: A method for fault diagnosis of a pressure sensor of an electro-hydraulic system with an explicit controller and an implicit controller in parallel is provided. The method may include receiving parameter information of the electro-hydraulic system; estimating a first chamber pressure of the hydraulic actuator online by utilizing a second chamber pressure of the hydraulic actuator; obtaining valve opening signals of the explicit controller and the implicit controller in a valve controller; converting the valve opening signals are difference-calculated to obtain two residual signals; and the residuals of an independent metering valve 1 and an independent metering valve 2 are compared with a preset threshold, respectively, to identify whether the independent metering valve 1 and the independent metering valve 2 are faulty or not. The method is simple to operate, has a fast response time and low cost for troubleshooting, and improves the diagnostic accuracy and coverage of the electro-hydraulic system.

Abstract: The disclosure provides a flow self-compensating load sensing pump/valve coordinated electro-hydraulic system, including a prime mover, an electronically controlled variable pump, a flow control valve, a hydraulic actuator, a shuttle valve, an electronic control joystick, a bypass control valve, two pressure sensors, a bypass throttle valve, and a control system, where an oil outlet of the shuttle valve is connected to a right spring chamber of the bypass control valve, a left chamber and an oil inlet of the bypass control valve are connected to an oil outlet of the electronically controlled variable pump, an oil inlet and an oil outlet of the bypass throttle valve are connected to an oil outlet of the bypass control valve and an oil tank, two ends of the oil inlet and the oil outlet of the bypass throttle valve are provided with the first pressure sensor and the second pressure sensor, respectively.

Abstract: The disclosure provides a flow self-compensating load sensing pump/valve coordinated electro-hydraulic system, including a prime mover, an electronically controlled variable pump, a flow control valve, a hydraulic actuator, a shuttle valve, an electronic control joystick, a bypass control valve, two pressure sensors, a bypass throttle valve, and a control system, where an oil outlet of the shuttle valve is connected to a right spring chamber of the bypass control valve, a left chamber and an oil inlet of the bypass control valve are connected to an oil outlet of the electronically controlled variable pump, an oil inlet and an oil outlet of the bypass throttle valve are connected to an oil outlet of the bypass control valve and an oil tank, two ends of the oil inlet and the oil outlet of the bypass throttle valve are provided with the first pressure sensor and the second pressure sensor, respectively.

Abstract: The embodiments of the present disclosure provide a terminal force soft-sensing method of a hydraulic manipulator.

Abstract: The embodiments of the present disclosure provide a terminal force soft-sensing method of a hydraulic manipulator.