A 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, 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 signal connected to the probe coil A detection circuit, a self-diagnosis unit connected with the signal detection circuit. The input terminals of the three detection coils in the sensor and the probe are respectively connected with three high-frequency signal sources through three controllable high-frequency switches; the output terminals of the three detection coils are respectively connected with mutually independent signal detection circuits; The frequency switch and the signal detection circuit are also connected with the timing controller (T); the three signal detection circuits output three independent air gap detection values. When a single-channel detection fault occurs, the fault diagnosis unit outputs fault location information, indicating the location of the faulty detection channel. It can still provide effective real gap value when a single path failure occurs, and has a redundant 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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