Taiyuan University of Technology

Long Quan

Lei Ge

Bo Wang

Yunxiao Hao

Jing Yang

Lianpeng Xia

He Liu

Jiahai Huang

Huimin Hao

Zepeng Li

Xiangyu Wang

Xingyu Zhao

Shufei Qiao

Weinan Huang

Tao Liang

Bing Wu

Xiaohong Han

Youshan Gao

He Wang

Bin Zhao

The present disclosure belongs to the technical field of hydraulic control, and relates to a velocity and position compound control system for a pump-valve dual-source driven hydraulic cylinder used in engineering machinery. The system includes a first power source, a first hydraulic pump, a second power source, a second hydraulic pump, a safety valve, a proportional directional valve, a pilot operated check valve, a single-rod hydraulic cylinder, a handle, a tank, a rotating speed sensor, a first pressure sensor, a second pressure sensor, a third pressure sensor, a temperature sensor, a position transmitting unit, magnetic induction marks, a count correction module, an integrator module, a calculation control module, a signal acquisition module, a data storage module, a cloud memory, a communication protocol module, a fault diagnosis module, and a process monitoring module.

Velocity and position compound control system for pump-valve dual-source driven hydraulic cylinder

Disclosed is a flow control system for digital and mechanical redundant pressure compensation. On the basis of an original pressure compensation valve, two-position three-way electromagnetic valves are added to control the opening and closing of pressure compensation valves. Furthermore, pressure sensors and a controller are added, so that the system has a digital pressure compensation function. When the pressure sensor breaks down, the flow control system is switched to a mechanical compensation mode to achieve mechanical pressure compensation, the problem that system flow cannot be controlled when the sensor breaks down is solved, and the purpose of redundancy control is achieved. Moreover, the pressure compensation valve in the loop where the highest load is located can be controlled to be completely opened through the two-position three-way electromagnetic valve to reduce pressure loss of the valve port, and the pressure is not affected by load fluctuation.

Flow control system for digital and mechanical redundant pressure compensation

A multifunctional electro-hydraulic flow control valve and a flow control method. The control valve comprises a main valve, a proportional pilot valve, a flow sensor, a multifunctional valve controller, a control cavity pressure sensor, an oil inlet pressure sensor, an oil outlet pressure sensor, a temperature sensor and a cloud storage. The invention has the characteristics that a flow of the main valve is continuously controlled without being influenced by load change without installing a pressure compensator in the system, and meanwhile, the valve has the function of a flow sensor, has low pressure loss and wide flow control range, and realizes integration of flow detection and control; and information such as flow, power and efficiency of each part in a hydraulic system is monitored in real time based on a multifunctional controller, key operation state monitoring, service life prediction and fault positioning of the control valve are achieved.

Multifunctional electro-hydraulic flow control valve and flow control method

A hydraulic-electric coupling driven multi-actuator system and control method are provided. The system comprises one or more hydraulic-electric hybrid driven actuators, first inverters, control valves, centralized hydraulic units and control units, wherein each hydraulic-electric hybrid driven actuator is correspondingly connected with one first inverter and one control valve; the centralized hydraulic units are connected with the control valves and configured to supply oil for the hydraulic-electric hybrid driven actuators and to perform power compensation; and the control units are respectively connected with the hydraulic-electric hybrid driven actuators, and each control unit is configured to control output torque of a first motor of the corresponding hydraulic-electric hybrid driven actuator based on pressure information of the hydraulic-electric hybrid driven actuator, such that pressure of driving cavities of the hydraulic-electric hybrid driven actuators is equal.

Hydraulic-electric coupling driven multi-actuator system and control method

The present invention provides an engineering machinery hydraulic system with compensation differential pressure controllable, uses an electronic pressure compensating valve to solve the problem of flow mismatch under conditions of pressure over-limit and flow saturation, and realizes proportional shunt control and high-precision flow distribution of the system. The engineering machinery hydraulic system disclosed in the present invention has the advantages of low energy consumption, fast response speed, and high flow control precision.

Engineering machinery hydraulic system

The present invention discloses a load-sensing multi-way valve with a variable differential pressure, where each valve group uses a new element: an electro-hydraulic pressure compensation valve, so as to implement continuous real-time adjustment and control of compensated differential pressure and real-time position feedback and monitoring of a compensation valve trim, and overcome a flow mismatch problem of a conventional LS system in a flow saturation working condition and problems of a fixed shunting proportion of an LUDV system and poor operation coordination of actuators. The load-sensing multi-way valve with a variable differential pressure disclosed in the present invention has advantages such as strong working condition applicability, high flow distribution accuracy, and strong technicality.

Load-sensing multi-way valve with variable differential pressure

A variable-speed volume-control direct-drive all-electric hydraulic excavator drive and energy recover system the control drive circuit of which includes the A, B, C energy source, boom cylinder control valve group, arm cylinder control valve group, bucket control valve, swing control valve, swing motor control valve group, left travel control valve, right travel control valve, eight 2-position 2-way valve, I and II 2-position 3-way valve, I and II accumulator. The drive control circuit adopts open control independent-cavity variable-speed pump-control volume direct-drive circuit. Each of the cavities of cylinder is controlled by an energy source and the pressure and flow rate of the cavities are adjusted by the rotational speed and torque control of the generator independently. The present invention is four-quadrant running and have advantages of high efficiency, high integrity, low consumption, redundancy energy source, no need for pilot supply, low noise, integrate recovery of kinetic and potential energy.

Variable-speed volume-control direct-drive all-electric hydraulic excavator driving and energy recovery system

A double-loop control system with a single hydraulic motor relates to a technical field of hydraulic transmission control, including a hydraulic motor (), a positive control loop (), a negative control loop (), a hydraulic pump (), an accumulator (), and an oil tank, wherein the hydraulic motor () adopts a unique thrust structure with four inlet/outlet ports; the positive control loop () and the negative control loop () independently control the hydraulic motor (), wherein the positive control loop () and the negative control loop () drive together or only one drives; or braking kinetic energy and potential energy of loads are stored in the accumulator () for energy recovery. The present invention uses only one hydraulic motor for satisfying different work conditions and different load driving requirements with advantages such as simple structure, high system reliability and high energy efficiency.

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Taiyuan, China

Long Quan