A single-probe double-coil self-diagnosing maglev train levitation air-gap sensor

Abstract

A single-probe double-coil self-diagnosing maglev train suspension air gap sensor, including a controllable high-frequency switch connected to a high-frequency signal source on the car body, a probe coil connected to the controllable high-frequency switch, and a signal connected to the probe coil The detection circuit is a self-diagnosis unit connected to the signal detection circuit; the input terminals of the two detection coils of the sensor are respectively connected with two high-frequency signal sources through two controllable high-frequency switches; the output terminals of the two detection coils are respectively connected to independent The signal detection circuit is connected; the controllable high-frequency switch and the signal detection circuit are also connected with the timing controller (T); the two signal detection circuits output two independent air gap detection values, and the output of the signal detection circuit is also connected with the self-diagnosis unit The input terminals of (D) are connected, and the self-diagnosing unit outputs a sensor state diagnostic signal. The timing controller controls two detection coils and two signal detection circuits to detect two air gap signals in time division, and outputs two independent air gap values ​​without mutual interference.

Description

technical field [0001] The invention relates to an air gap sensor with a self-diagnostic function, in particular to a non-contact sensor for the suspension air 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 saf...

AI Technical Summary

Problems solved by technology

[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, which increases the complexity of the sensor

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