Digital hydraulic actuator system for composite speed adjusting of closed pump valve and control method of digital hydraulic actuator system

Abstract

The invention provides a digital hydraulic actuator system for composite speed adjusting of a closed pump valve and a control method of the digital hydraulic actuator system. The system comprises a servo motor, a two-way quantitative hydraulic pump, high-speed switching valves, an energy accumulator, a hydraulic cylinder, pressure protection valves, a pressure sensor, a displacement sensor, a speed encoder, a motion controller and other elements. During work, the servo motor drives the two-way quantitative hydraulic pump to work, hydraulic cylinder reversing and system volume speed adjusting can be achieved, the high-speed switching valves can adjust and control the flow in the system, composite speed adjusting of the pump valve is achieved, the pressure protection valves are used for setting the safety pressure of the system and the maximum working pressure of the hydraulic cylinder, the energy accumulator achieves oil suction and drainage by storing and releasing oil, the characteristic that the flow of an asymmetric cylinder is not balanced is overcome, the high-speed switching valves on an oil inflow way in the system can be used as load holding valves in a switched-off state,the hydraulic cylinder can be positioned, and the motion controller can control actions of all the elements after processing signals. The digital hydraulic actuator system for composite speed adjusting of the closed pump valve and the control method of the digital hydraulic actuator system have the beneficial effects of being flexible in control, high in precision, rapid in response, remarkable inenergy-saving effect, high in safety and the like.

Description

technical field [0001] The invention relates to the technical field of electro-hydraulic control, in particular to a digital hydraulic actuator system and a control method thereof for compound speed regulation of a closed pump valve. Background technique [0002] With the increasing requirements for flexible use and low energy consumption of the drive mechanism in aerospace and traditional industries, the hydraulic actuator system is a highly integrated system that integrates components such as motors, hydraulic pumps, hydraulic valves, and hydraulic cylinders. The advantages of higher power-to-weight ratio and transmission efficiency began to be gradually applied. However, the traditional hydraulic actuator system can only adjust the speed by changing the output flow of the pump, and the degree of control freedom is low; when the actuator is an asymmetric cylinder, the flow imbalance characteristic of the hydraulic system affects the control accuracy of the hydraulic system...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a closed-type pump-valve composite speed-regulating digital hydraulic actuator that effectively solves the problems of low control precision, single control means, low precision and low operation safety in the traditional hydraulic actuator system. actuator system

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