Control circuit for airjet loom solenoid valve based on ARM7

GUO Zhangjun1, WU Zhenyu1, LIU Fengchen2
（1. Faculty of Mechanical Engineering & Automation,Zhejiang SciTech University, Hangzhou 310018, China;
2. Hangzhou Wahaha Group Co. Ltd. , Hangzhou 310018, China）

Abstract: In order to complete the realtime control of airjet loom high frequency solenoid valve, and to promote the fault detection ability of solenoid valve when they work, a control system of high speed driving and current detecting feedback of solenoid valve with ARM7 was designed.ARM7 process chip LPC2478 was  used  as microcontroller, then an output line expansion circuit was designed with complex programmable logic device(CPLD) on the basis of microprocessor date/address bus. A high speed driving circuit was designed by the high, low voltage composite technology with the characteristic of airjet loom solenoid valve. Current detecting part was added for judging the working performance of solenoid valve. The test results show that the system has stable operation, high efficiency. The production quality and efficiency of airjet loom are improved by the research of current detecting feedback data.
Key words: airjet loom； ARM7；solenoid valve；complex programmable logic device(CPLD)；control circuit；current detection