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Front. Inform. Technol. Electron. Eng.  2014, Vol. 15 Issue (10): 892-902    DOI: 10.1631/jzus.C1400056
    
比例方向阀差动控制算法
Bo Jin, Ya-guang Zhu, Wei Li, De-sheng Zhang, Lu-lu Zhang, Fei-fei Chen
The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; Ningbo HOYEA Machinery Manufacture Co., Ltd., Ningbo 315131, China
A differential control method for the proportional directional valve
Bo Jin, Ya-guang Zhu, Wei Li, De-sheng Zhang, Lu-lu Zhang, Fei-fei Chen
The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; Ningbo HOYEA Machinery Manufacture Co., Ltd., Ningbo 315131, China
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摘要： 研究目的：对于由两个比例电磁铁控制的比例方向阀，常用的控制方法仅给其中一个电磁铁供电，因此，阀的性能受到比例电磁铁特性影响，如死区、小电流时的力增益非线性等，且此影响无法用简单的死区电流补偿消除。本文提出差动控制方法（differential control method），以改善比例电磁铁的性能。
\n创新要点：在建立比例阀电磁铁非线性模型的基础上，提出了差动控制策略，建立差动控制器输出互成差动关系的两路控制信号，分别激励比例阀的左右两个比例电磁铁，以总体力增益恒定为优化目标选取最佳工作点，从而减小比例阀电磁铁的非线性，改善比例方向阀性能。
\n方法提亮：同时驱动比例方向阀的两个比例电磁铁，使两路控制信号满足差动关系，合理配置静态工作点使两路比例电磁铁的合力线性度最高，并通过阀芯位移反馈实现对阀芯位置的闭环控制。
\n重要结论：实验结果表明，差动控制算法能够有效改善比例阀电磁铁的非线性特性，提高比例方向阀阀心位移的控制精度与响应速度。
关键词： 差动控制方式;  频率响应;  比例方向阀;  阀芯位移反馈    
Abstract: For the proportional directional valve controlled by two proportional solenoids, the normal control method (NCM) energizes only one solenoid at a time. The performance of the valve is greatly influenced by the nonlinearity of the proportional solenoid, such as dead zone and low force gain with a small current, and this effect cannot be eliminated by a simple dead-zone current compensation. To avoid this disadvantage, we propose the differential control method (DCM). By employing DCM, the controller outputs differential signals to simultaneously energize both solenoids of the proportional valve, and the operating point is found by analyzing the force output of the two solenoids to make a minimum variation of the current force gain. The comparisons of the valve response characteristics are made between NCM and DCM by nonlinear dynamic simulation and experiments. Simulation and experimental results show that by using DCM, the frequency response of the valve is greatly enhanced, especially when the input is small, which means that the dynamic characteristics of the proportional valve are improved.
Key words: Differential control method    Frequency response    Proportional directional valve    Spool displacement feedback
收稿日期: 2014-02-23 出版日期: 2014-10-09
CLC:  TP271.3  
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Bo Jin
Ya-guang Zhu
Wei Li
De-sheng Zhang
Lu-lu Zhang
Fei-fei Chen

引用本文:

Bo Jin, Ya-guang Zhu, Wei Li, De-sheng Zhang, Lu-lu Zhang, Fei-fei Chen. A differential control method for the proportional directional valve. Front. Inform. Technol. Electron. Eng., 2014, 15(10): 892-902.

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http://www.zjujournals.com/xueshu/fitee/CN/10.1631/jzus.C1400056    或    http://www.zjujournals.com/xueshu/fitee/CN/Y2014/V15/I10/892

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