Rail wheel sensing device

Abstract

A rail wheel sensing device comprises a wheel sensing unit, a first pulse interference filter unit and a second pulse interference filter unit. The wheel sensing unit comprises two magnetic head type wheel sensors, positive narrow pulse interference generated in the negative broad pulse period and negative narrow pulse interference generated in the positive broad pulse period, are filtered by the first pulse interference filter unit and the second pulse interference filter unit for a first input sensing signal and a second input sensing signal respectively, and the continuous shake narrow pulse interference signal is particularly filtered. The maximum width of positive narrow pulses needing to be filtered and the maximum width of negative narrow pulses needing to be filtered can be regulated by changing the charging time constant and the discharging time constant respectively. The rail wheel sensing device can be applied to the occasions where wheel detecting and axle counting are conducted on locomotives and trains on a rail.

Description

technical field [0001] The invention relates to a sensing and detecting device for a rail transit vehicle, in particular to a rail wheel sensing device. Background technique [0002] The track surface of the track circuit is badly shunted due to the influence of bad conductors. When a train or locomotive occupies the track, the track relay that controls the track section cannot operate normally, resulting in signal interlock failure. When the axle counting sensor solution is adopted, the mechanical sensor relies on the spring to control the on-off of the electrode contacts to generate the signal of the arrival of the train, which is prone to poor contact and signal jitter interference; the infrared rays of the infrared sensor are easily blocked by dust and debris, and are easily affected. The interference of other light produces interference pulses; the ultrasonic piezoelectric transducer cannot be effectively protected because it must be exposed, and is also susceptible to ...

AI Technical Summary

Problems solved by technology

[0002] The track surface of the track circuit is affected by bad conductors, causing poor track circuit shunting. When a train or locomotive occupies the track, the track relay that controls the track section cannot operate normally, resulting in signal interlock failure.

When the axle counting sensor solution is adopted, the mechanical sensor relies on the spring to control the on-off of the electrode contacts to generate the signal of the arrival of the train, which is prone to poor contact and signal jitter interference; the infrared rays of the infrared sensor are easily blocked by dust and debris, and are easily affected. The interference of other light produces interference pulses; the ultrasonic piezoelectric transducer cannot be effectively protected because it must be exposed, and is also susceptible to interference from other obstacles such as construction workers, resulting in interference pulses; eddy current coil induction, magnetic head sensor induction It is easily affected by metal debris. For example, when a railway construction worker slides a shovel over the magnetic head sensor, it is easy to cause interference to the magnetic head discrimination and output interference pulses

When the above-mentioned various sensors enter or exit the detection interval, due to the vibration of the sensor caused by the passing of the vehicle, the vibration of the wheel itself, and the vibration of the sensor's own contacts, etc., it will also cause the edge of the sensor signal to generate a jitter pulse.

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