分段供电切换传感器的在线故障诊断方法

摘要

分段供电切换传感器是多段直线电机控制系统的重要部件。针对其故障检测与定位的问题，提出一种切换传感器故障的在线诊断方法。对采集的传感器信号数据进行压缩，以提高计算的效率；研究切换传感器信号根据次级运动的变化规律，定义标准信号集合；给出计算传感信号差异度的方法，作为分析信号相似程度的量化指标；将问题表示为基于有向图的搜索问题，并根据问题的特点缩小搜索的范围；由此提出搜索算法，可以根据测量的传感信号时序估计传感系统的状态变迁过程；给出故障定位流程，利用算法估计的结果，根据系统标准信号集合进行故障定位。为了说明算法与预期结果的一致性，给出3个命题并进行证明；通过实验验证了故障诊断方法的有效性。%Segment-powered switch control sensor is an important component for the segmented linear motor control system.For the problems of fault diagnosis and location,an online fault diagnosis method of switch control sensor was proposed.Sensor signal data were compressed to improve computational efficiency;the law of switch control sensor signals changing with shuttle movement was studied,and a set of standard signals were defined;a calculating method for the sensor signal difference which is considered as a quantitative indicator of similarity analysis of signal was given;this problem was represented as the search problem of directed graph and the search was narrowed to a smaller area according to the characteristics of the problem;the search algorithm was given for estimating the process of system state transition according to the metrical data of sensor signals;the fault location process was proposed on the basis of the standard signal set,then the faults were located with the estimated results of the algorithm.Three propositions were given and proved to discuss the consistency between the algorithm and the expected result.The fault diagnosis method was validated through the fault data analysis of actual prototype.