称重设备传感器零漂检测方法研究

Study on zero drift fault detection of the sensor in weighing equipment

数字化改造后的称重设备其称重传感器具有故障诊断的功能,但目前缺少针对称重传感器零漂故障诊断的方法。为此,文章提出了基于滑窗原理和零点采样序列标准差的零漂故障检测方法。首先对称重传感器的零点输出信号采样,然后利用滑窗取出其中的n个连续值,求出这n个值的标准差,最后用此标准差与正常输出标准差的比值作为检测依据。当比值大于设定阈值时,传感器存在故障,否则不存在故障。测试表明该方法能有效检测传感器的零漂故障。

The load cells in weighing equipment have the self-diagnosis function when they are digitized. However,at present,the method of zero drift fault diagnosis for load cells is lack. So,this paper presents a method for detecting load cell＇s zero drift,which based on sliding window and standard deviation of the zero-crossing points sample series. Firstly,the null point outputs of load cell are sampled,then n continuous values are extracted by using sliding window,and the standard deviation of these numbers is calculated. Lastly,using the ratio of this standard deviation and normal standard deviation as the basis for diagnosis. When the ratio value is greater than the set threshold,the cell has fault,otherwise it is normal. Test results show that this way can effectively diagnose zero drift of the load cells.