Research on fault diagnosis problems of levitation sensor on Maglev train based on tracking differentiator

On account of the fault diagnosis problems of the levitation sensor on maglev train, this paper introduces a non-linear second-order discrete tracking differentiator to estimate the output value of the sensor, and judges whether the sensor has the fault by comparing the estimated value and the measured value. On the basis of the simulation analysis, fault diagnosis experiment of the current sensor on the maglev vehicle is made. The experimental result verifies the validity of the algorithm.