Single-probe three-coil maglev train gap sensor with fault location function

Abstract

A single-probe three-coil maglev train gap sensor with a fault location function comprises controllable high-frequency switches which are each connected with a high-frequency signal source on a train body, probe coils which are each connected with one controllable high-frequency switch, signal detection circuits which are each connected with one probe coil, and a self-diagnosis unit connected with the signal detection circuits. The input ends of the three detection coils inside sensor probes are respectively connected with the three high-frequency signal sources through the three controllable high-frequency switches; the output ends of the three detection coils are respectively connected with the signal detection circuits which are independent of one another; the controllable high-frequency switches and the signal detection circuits are connected with a timing controller (T); and the three signal detection circuits output three independent air gap detection values. When there is a single-channel detection fault, the fault diagnosis unit outputs fault location information and indicates the position of a detection channel where the fault occurs. When a single channel fails, an effective real air gap value can still be provided. The single-probe three-coil maglev train gap sensor has a redundancy function.

Description

technical field [0001] The invention relates to a gap sensor with a fault location function, in particular to a non-contact sensor for the suspension gap of a maglev train. Background technique [0002] The maglev train adjusts the current in the suspension electromagnet through the suspension control system to keep the train in stable suspension. The suspension air gap sensor can realize non-contact real-time detection of the suspension air gap between the train electromagnet and the track, and at the same time send it to the suspension controller for closed-loop control . Therefore, the accuracy and reliability of the air gap sensor directly affect the performance of the suspension control system. Any abnormal output of the air gap sensor will affect the dynamic performance of the train suspension control system, reduce the ride comfort of the train, and even aggravate the train-rail coupling. Vibration causes the control system to collapse and endangers the safety of tra...

AI Technical Summary

Problems solved by technology

Another double-probe air-gap sensor generally uses a double-coil detection method to realize the self-diagnosis function. Each probe contains a detection coil. In order to avoid the magnetic field coupling between the two probe coils, the two probe coils are generally Arranged at a far distance, and the two probe coils generally use signal sources of different frequencies, and when a fault occurs in the detection channels of the two coils, it is impossible to distinguish which fault occurs, and the fault cannot be located

[0004] The main deficiency of the current technology is that there is only one detection result when a single coil is detected in a single probe. The sensor itself has no diagnostic function, and the suspension controller cannot judge whether the detection result of the sensor is correct. When the sensor itself fails, it will directly cause the suspension control system to fail; In order to reduce the interference caused by the magnetic coupling between the two coils during double-coil detection, a certain distance must be kept between the two coils, making the sensor probe larger in size and inconvenient to install or even unable to be installed due to space constraints, and the distance between the two coils The magnetic coupling cannot be completely eliminated, and the detection results of the two detection coils are affected by each other's working status

In addition, although the electrical parameters of the two coils are the same, in order to reduce the magnetic field interference between the two coils, the frequency of the signal source cannot be the same, resulting in different parameters of the detection circuit, increasing the complexity of the sensor, and at the same time, it is impossible to distinguish useful when a single fault occurs. information, the location of the fault cannot be located

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