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

doi:10.1631/jzus.C1400056

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A differential control method for the proportional directional valve

Electrical & Electronic Engineering | Updated：2022-05-19

- A differential control method for the proportional directional valve
- 比例方向阀差动控制算法
- Frontiers of Information Technology & Electronic Engineering Vol. 15, Issue 10, Pages: 892-902(2014)
- Affiliations：
  
  1.The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
  2.Ningbo HOYEA Machinery Manufacture Co., Ltd., Ningbo 315131, China
- Author bio：
  
  [ "Bo JIN, bjin@zju.edu.cn" ]
- Funds：
- DOI：10.1631/jzus.C1400056
  CLC： TP271.3
- Received：23 January 2014，
  
  Revised：2014-;9-17，
  
  Published：2014-10
- Accepted：
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Bo JIN, Ya-guang ZHU, Wei LI, et al. A differential control method for the proportional directional valve[J]. Frontiers of Information Technology & Electronic Engineering, 2014, 15(10): 892-902.
DOI：

Bo JIN, Ya-guang ZHU, Wei LI, et al. A differential control method for the proportional directional valve[J]. Frontiers of Information Technology & Electronic Engineering, 2014, 15(10): 892-902. DOI： 10.1631/jzus.C1400056.

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。

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。

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。

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。

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.

关键词

Keywords

references

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