| Related citation: | Qiang Wu,Xingyu Ji,He Wang,Huimin Hao,Jiahai Huang.New Dead-zone Compensation Approach for Proportional Flow Valve[J].Journal of Harbin Institute Of Technology(New Series),2022,29(1):45-56.DOI:10.11916/j.issn.1005-9113.20063. |
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| Author Name | Affiliation | | Qiang Wu | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | Xingyu Ji | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | He Wang | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | Huimin Hao | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | Jiahai Huang | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: |
| To solve the dead-zone in the output flow curve of the proportional flow valve without displacement sensor, a dead-zone compensation approach is proposed in this paper. Instead of detection and feedback of the valve spool position, the proposed approach adopted the pressure drop across the valve metering orifice to accomplish the dead-zone compensation. The first step was to test and get the maximum output flow, Qmax, at a preset reference pressure drop, such as ΔP0. The next step was to construct the target compensation flow curve, which is a line through (0, 0) and (ΔP0, Qmax). Then a compensation law was designed to approach the target curve. However, the research results show that the above strategy caused over-compensation once the actual pressure drop deviated from ΔP0. Thus a correction coefficient, β, was presented to correct the initial compensation law as the pressure drop deviated from ΔP0. For example, the test results indicate that the corrected compensation approach could reduce the dead-zone from 53.9% to 3.5% at a pressure drop of 1 MPa; as the pressure drop was increased to 5 MPa, the dead-zone was reduced from 51.7% to 3.5%. Therefore, the following conclusions can be drawn: the proposed compensation approach is feasible, which can effectively reduce the dead-zone and improve the output flow static performance of the proportional flow valve without spool displacement feedback. |
| Key words: proportional flow valve flow dead-zone dead-zone compensation pressure drop |
| DOI：10.11916/j.issn.1005-9113.20063 |
| Clc Number:TH13 |
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| Descriptions in Chinese: |
| 新的比例流量阀死区补偿方法 吴强，吉星宇，王鹤，郝慧敏，黄家海 （太原理工大学 机械与运载工程学院，太原 030024） 创新点说明：对于没有位移传感器的电液比例流量阀存在的死区问题，提出了基于阀口压差的死区补偿方法，并针对不同的压差工况，提出修正系数优化补偿方案。 中文说明： 针对无阀芯位移传感器的电液比例流量阀面临的死区问题，常规的死区补偿方法效果十分有限，为解决这一问题，提出一种新的死区补偿方法。首先对电液比例流量阀结构和死区模型进行了描述，提出了基于阀口压差的死区补偿方法；其次，利用Matlab/Simulink软件建立了死区补偿模型，对比分析了不同压差条件下死区补偿方法的有效性；最后，搭建了由补偿器、NI数据采集仪、电液比例流量阀等组成的试验台，对比分析了仿真和实验的补偿结果以及负载、温度等因素对死区的影响。研究结果表明，压差是影响死区范围的一个重要因素，死区范围随着压差的增大而减小，所提死区补偿方法可将无阀芯位移传感器比例流量阀的死区范围减小到3.5%；针对阀口压差变化所导致的补偿精度降低的问题，提出了补偿系数修正补偿曲线以达到期望效果，并有效避免了由压差引起的过补偿现象。此外，实验论证了温度对死区范围影响很小，补偿器在不同温度、负载条件下依然可以正常工作。因此可得如下结论：本文提出的基于阀口压差的死区补偿方案，在5Mpa和1Mpa工况下，可以将死区减小到3.5%，针对不同温度、负载工况下实际补偿效果的分析，验证了该补偿方法的有效性。但是，关于负载对于死区范围的影响，本文并没有做相关探索，在后续研究中将予以讨论。 关键词：比例流量阀、流量死区、死区补偿、压差 |
