先导流量压差变化-位移校正电液比例阀特性

发布时间：2018-01-29 04:20

本文关键词： Valvistor 压差变化-位移校正比例流量阀　出处：《机械工程学报》2017年14期 　论文类型：期刊论文

【摘要】：比例流量阀可根据设定信号连续比例控制执行器的速度或者转速,是重要的电液控制元件,广泛应用于各类电液系统。传统电液比例流量阀为消除负载压力变化对流量的影响,需要采用压差补偿器或流量传感器,增加了阀结构的复杂性和体积,并引起附加的节流损失。针对这些问题,根据Valvistor阀的流量放大特性,提出基于先导流量压差变化-位移校正、主阀流量放大的新型电液比例流量控制原理,该方法根据压力传感器检测的先导阀口压差实时校正先导阀芯位移,并通过主阀线性放大先导阀流量。研究中,建立新型比例流量阀的数学模型,推导得出基于补偿原理的控制策略;进一步建立阀的仿真模型,对比分析补偿前后比例流量阀的静动态特性;设计制造试验样机,通过试验验证了所提原理的可行性。测试结果表明,采用该原理可消除主阀口压差变化对输出流量的影响,动态响应快,特别适用于大流量的电液流量控制。
[Abstract]:Proportional flow valve can continuously control the speed or speed of actuator according to the set signal. It is an important electro-hydraulic control element. Traditional electro-hydraulic proportional flow valve is widely used in various electro-hydraulic systems. In order to eliminate the influence of load pressure change, pressure difference compensator or flow sensor is needed, which increases the complexity and volume of valve structure. In view of these problems, according to the characteristics of Valvistor valve flow amplification, based on the pilot flow pressure difference change-displacement correction. A new type of electro-hydraulic proportional flow control principle for main valve flow amplification is presented. This method corrects the displacement of lead valve core according to the pressure difference of pilot valve detected by pressure sensor, and amplifies the flow rate of pilot valve linearly through main valve. The mathematical model of the new proportional flow valve is established and the control strategy based on the principle of compensation is derived. The simulation model of the valve is further established, and the static and dynamic characteristics of the proportional flow valve before and after compensation are compared and analyzed. The feasibility of the proposed principle is verified by the design and manufacture of the test prototype. The test results show that the effect of the pressure difference of the main valve on the output flow can be eliminated and the dynamic response is fast. It is especially suitable for electro-hydraulic flow control with large flow rate.
【作者单位】：太原理工大学新型传感器与智能控制教育部与山西省重点实验室;
【基金】：国家自然科学基金资助项目(51175362,51605322)
【分类号】：TH137.52
【正文快照】： 0前言*比例流量阀可根据设定信号连续比例控制执行器的速度或者转速,是重要的电液控制元件,广泛应用于各类电液系统。比例流量阀包括比例节流阀和比例调速阀两类,大流量的液压系统均采用先导型结构,比例调速阀是在比例节流阀基础上增加压差补偿器或流量传感器来构成。压差补偿

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