比例电磁阀变频率PWM驱动方法  

Proportional Electromagnetic Valve Driven by Frequency-varying PWM

作　　者：康健 尚沙沙 焦文学 王杏 浦定超 钮震 叶其团 汪春晖 

机构地区：[1]三一重机小型挖掘机研究院,昆山215334

出　　处：《中国机械工程》2015年第8期1024-1028,共5页China Mechanical Engineering

摘　　要：在挖掘机等工程机械中使用的嵌入式控制器普遍利用脉冲宽度调制(PWM)来驱动比例电磁阀。但由于PWM脉冲输出的特点和电磁阀自身电感特性的双重制约,使PWM驱动的比例电磁阀性能难以充分发挥,甚至会影响控制系统整体稳定性。因此,一种根据不同占空比改变PWM频率的方法被用于驱动比例电磁阀。控制器根据电磁阀控制需求的不同占空比,输出不同频率的PWM。测试结果证明,使用变频率PWM驱动比例电磁阀的方法可以在保证比例电磁阀二次压力稳定的前提下,维持自身的小幅震荡,同时降低比例电磁阀的功率损耗。In applications of excavator or other industrial machines, proportional electromagnetic valve was usually driven by PWM signals of embedded control system. However, due to pulse output characteristics of electromagnet, the performance of proportional electromagnetic valve was limited, e- ven impacted stability of the system. A frequency-varying method of PWM driving was proposed. Ac- cording to different duty ratio of PWM, the embedded control system output PWM with different fre- quencies. Through this method, the output oil pressure of proportional electromagnetic valve main- tains within a determinated range, the valve-core＇s zero-average oscillations is reserved and power consumption of proportional electromagnetic valve is relatively low.

关 键 词：比例电磁阀 脉冲宽度调制 挖掘机 电控泵 

分 类 号：TP271[自动化与计算机技术—检测技术与自动化装置]