摘要
为了提高液压机用数字阀增量控制精度,提出了一种阀芯限位电液数字阀控系统。把电机旋转角转换成阀芯位移,根据脉冲信号频率与个数确定阀芯速度与位置,达到调控油液流量与方向的效果。对电液数字阀控系统的位置精度控制构建了仿真模型,之后利用该模型进行了控制过程的动态性能测试。仿真结果表明:电液数字阀导程依次为2 mm、4 mm与6 mm时,响应时间依次为298 ms、175 ms与130 ms。提高导程之后,获得了更短的阶跃响应时间,超调量也明显增大,系统出现了抖动,降低了控制过程的稳定性。实验结果表明:从总体变化趋势上看仿真结果和实验结果达到了良好吻合状态。仿真结果和实验结果之间出现一定的延迟是由于被测试阀形成了一定程度的负开口,导致阀芯、阀套间形成0.1 mm死区,引起延迟现象。
In order to improve the incremental control precision of digital valve for hydraulic press,an electro-hydraulic digital valve control system with spool limit position was proposed.The motor rotation angle is converted into the displacement of the spool,and the speed and position of the spool are determined according to the frequency and number of pulse signals to achieve the effect of regulating the flow and direction of the oil.A simulation model for position precision control of electro-hydraulic digital valve control system is built,and then the dynamic performance of the control process is tested by using the model.The simulation results show that when the lead of the electro-hydraulic digital valve is 2 mm,4 mm and 6 mm respectively,the response time is 298 ms,175 ms and 130 ms respectively.After the lead is increased,the step response time is shorter,the overshoot is obviously increased,and the system jitter occurs,which reduces the stability of the control process.The experimental results show that the simulation results are in good agreement with the experimental results from the overall trend of change.The delay between the simulation results and the experimental results is due to the fact that the tested valve forms a certain degree of negative opening,which leads to the formation of 0.1 mm dead zone between the valve core and valve sleeve,thus causing the delay phenomenon.
作者
苏力
薛峰
SU Li;XUE Feng(School of Electronic Engineering Xi'an Aeronautical University,Xi'an 710077,China;School of Electronic Information Northwestern Polytechnical University,Xi'an 710072,China)
出处
《液压气动与密封》
2022年第2期53-56,共4页
Hydraulics Pneumatics & Seals
基金
航空科学基金(2019ZH0T7001)。
关键词
电液数字阀
位置精度
控制系统
仿真分析
实验验证
响应时间
electro-hydraulic digital valve
position accuracy
control system
simulation analysis
experimental verification
response time
