Abstract
The electrical modulation valve can provide proportional output valve element displacement, flow, or pressure according to a continuously changing input electrical signal. It is the core component of electro-hydraulic proportional control technology. To remove the influence of pressure difference changes on the output flow, the traditional scheme is to use a pressure compensation valve, which increases the difficulty of both manufacturing and maintaining the valve. To solve this problem, a method of digital and mechanical redundancy control flow is proposed. Pressure sensors are installed at the inlet and outlet of the valve, and the controller adjusts the displacement of the valve element according to the pressure difference between the valve ports to realize high-precision control of the flow. A pressure compensation valve is installed in front of the valve, and a three-way solenoid valve is used to control the working of the compensation valve. In the case of sensor failure, the valve is switched to the mechanical compensation differential pressure mode, to control the flow and to achieve redundancy control. The system security is thereby improved. The feasibility of this scheme is verified through simulation and tests. The results show that, both for digital compensation and mechanical compensation, the output flow can be kept constant when the pressure difference changes, and the system has good static and dynamic characteristics. The principle can be applied to the displacement-flow feedback type electrical modulation valve, and can realize accurate control of the flow of the pilot valve and, finally, accurate control of the flow in the main valve.
摘要
目的
电调制阀可根据连续变化的输入电信号提供成比例输出的阀芯位移、流量或压力, 是电液比例控制技术的核心元件。本文旨在消除压差变化对阀输出流量的影响, 实现对电调制阀流量的高精度控制和安全冗余控制。
创新点
1. 提出了一种数字机械冗余控制电调制阀输出流量的方法, 实现了对流量的高精度控制和安全冗余控制。2. 建立了联合仿真模型和试验测试平台, 并通过仿真和试验证明了创新方案的可行性, 且系统动静态特性良好。
方法
1. 通过理论推导和数学模型分析, 得到压差变化时阀芯位移和输出流量的关系。2. 在仿真软件中建立电调制阀的机电液联合仿真模型, 并进行联合仿真研究, 验证所提方案的可行性。3. 建立电调制阀试验测试平台进行试验测试, 验证所提方案的正确性和可行性。
结论
1. 数字补偿流量方案可以在压差变化时保持通过阀的流量恒定, 流量控制精度高; 根据不同的流量要求, 可在控制器中设置参数, 灵活调整设定压差。2. 数字补偿流量方案可以在机械压力补偿阀的作用下控制流量, 达到冗余控制的目的, 提高系统的安全性。
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Acknowledgments
This work is supported by the National Key Research and Development Program of China (No. 2019YFB2004502), the National Natural Science Foundation of China (No. 51975397), and the Key Research and Development Program of Shanxi Province (No. 201903D111007), China.
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He LIU, Bin ZHAO, and Long QUAN designed the research. He LIU and Bo WANG processed the corresponding data. He LIU wrote the first draft of the manuscript. Bin ZHAO and Yun-xiao HAO helped to organize the manuscript. Long QUAN and Yun-wei LI revised and edited the final version.
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He LIU, Bin ZHAO, Bo WANG, Long QUAN, Yun-xiao HAO, and Yun-wei LI declare that they have no conflict of interest.
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Liu, H., Zhao, B., Wang, B. et al. Flow control characteristics of the digital and mechanical redundancy control electric modulation valve. J. Zhejiang Univ. Sci. A 23, 599–609 (2022). https://doi.org/10.1631/jzus.A2100526
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DOI: https://doi.org/10.1631/jzus.A2100526