基于CAN的电磁阀内孔及阀芯磨损检测传感器设计

Wear Detection Sensor for Inner Hole and Valve Core of Solenoid Valve with CAN

电磁阀阀芯频繁动作后易受磨损却无法及时发现并进行维护,设计一种用于电磁阀内孔及阀芯磨损检测传感器。传感器采用电容式原理,增加信号调理电路、单片机控制核心及CAN总线协议接口。传感器、显示仪表或测控系统之间通过线缆连接,解决电磁阀阀芯磨损传感器监测问题,CAN总线根据实际工况选择不同的通信速率和通信距离,降低了现场布线难度。通过连续多点采样电磁阀动作过程中传感器电压输出,分析该系列采样点的线性关系,求解其斜率,根据斜率变化可进行电磁阀阀芯磨损状况实时监测。实验表明,在该文的实验装置条件下,当阀芯、阀孔磨损单个磨损或磨损之和达到0.03 mm后,综合的线性预测的曲线斜率为小于-66,内泄漏等级超过了C级,此时传感器能检测磨损不可用状态。

The solenoid valve spool is vulnerable to wear after frequent actions,cannot be detected and maintained in time.A sensor for wear detection of the inner hole and spool of the solenoid valve is designed.The sensor adopts the capacitive principle,and adds a signal conditioning circuit,a single-chip control core and a CAN bus protocol interface.The sensors,display instruments or measurement and control systems are connected by cables to solve the problem of monitoring the wear sensor of the solenoid valve spool.The CAN bus selects different communication rates and communication distances according to the actual working conditions,which reduces the difficulty of on-site wiring.Through the sensor voltage output of the continuous multipoint sampling solenoid valve action,the linear relationship of the series of sampling points is analyzed to solve the slope of the solenoid valve core can be monitored according to the slope change.The experiment shows that under the condition of the experimental device,when the sum of the single wear or wear of the valve core and valve hole reaches 0.03mm,the comprehensive linear predicted curve slope is less than-66,and the internal leakage level exceeds C,and the sensor can detect the wear unavailable state.