JPH0583430B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a track circuit receiver for railway signals.

[Problems with conventional technology] Conventionally, low frequency orbit circuits such as commercial frequencies
As shown in the figure, it is composed of an AC power source with the function of a transmitter 11, a track transformer 15, a current limiting resistor 16, a track relay 17, a track circuit 12, etc., and voltage is constantly applied to the track relay. When a train enters and short-circuits the track circuit, the track side voltage applied to the track relay disappears and the track relay is restored, allowing train detection. The track relay uses the track side voltage that is input to the track relay via the track circuit.
It operates with V _T , the local voltage V _L input directly to the track relay from the AC power supply, and the phase difference φ between the two voltages, and is called a binary type. The torque τ at which the orbital relay operates is τ = kV _T V _L cos (φ − φ _n ), where k: proportionality constant φ _n : can be determined from the phase difference between V _T and V _L when the maximum torque is generated. can.

The phase difference φ changes depending on the condition of the current limiting resistor and the track, and to maximize the torque, adjust the value of the current limiting resistor so that φ=φ _n . If adjustment is not possible, a phase adjuster 18 is inserted between the track circuit 12 and the track relay 17 as shown in FIG. 7 to adjust the phase.

With binary track relays, it is necessary to adjust the phase in addition to the voltage, and since the phase varies greatly depending on the component, experience is required for maintenance and adjustment, and it also takes a lot of time to adjust. . Also,
The track relay has a large shape and requires a large installation space when many track circuits are concentrated in a station, etc.

[Means for Solving the Problem] The present invention is a method suitable for computerizing track relays, and detects the phase in which the local side voltage changes from negative to positive, and calculates the local side voltage based on the output. A local voltage waveform is generated with a delay of the phase difference with the track side voltage, and multiplied by the track side voltage.
The multiplied values are averaged and the average value is compared with the train detection level to determine the presence or absence of a train.

Furthermore, by measuring the time until the track side voltage reaches its maximum value based on the above phase change detection output, and by giving a phase setting control signal, that time can be stored as a new time delay. The correction value for the time delay due to the phase difference between the track side voltage and the local side voltage can be automatically set.

When a large number of track circuits are concentrated in one place, such as in a station premises, the input and output of the receiver are synchronized and switched using a switch to sequentially process them. In other words, by time-sharing processing, many track circuits can be can be controlled with one set of receivers.

[Function] Multiplying the local side voltage delayed by a certain period of time so that the phase of the local side voltage matches the phase of the track side voltage and the track side voltage, and then taking the average and determining the level is the same as the torque of a conventional track relay. The idea is similar to that. If a waveform with a different phase of the track side voltage is input due to a disturbance current, the average value of the multiplication result of the local side voltage and the track side voltage will be small, and it will be determined that there is no train even though there is a train. Never.

[Embodiment] FIG. 1 shows an embodiment of a track circuit receiver according to the present invention. When the local side voltage changes from negative to positive, the change detector 2 generates a pulse. When a pulse is detected, a local voltage waveform delayed by the time set by the time delay setter 3 is generated from the waveform generator 4.
The multiplier 5 multiplies the track side voltage and the local side voltage. Thereafter, a moving average processor 6 calculates the average, a detection level comparator 7 compares it with the train detection level, and outputs the train detection according to the result. Second
The figure shows the waveforms of each part. When the phase of the local voltage changes, a pulse wave is generated from the change detector. The waveform generated by the waveform generator by the time delay setting device becomes a waveform with the same phase as the track side voltage, and when the multiplier multiplies the track side voltage and the local side voltage, it becomes a waveform with twice the original frequency. Furthermore, the average is taken and compared with the train detection level, and if it is larger, it is determined that there is no train, but if it is smaller, it is determined that a train is entering the track circuit, and that information is output.

Since the different phases of the local side voltage and track side voltage are set in advance, even if a voltage with a different phase than the track side voltage is applied to the receiving input, the average value will be small as shown in Figure 3, and the phase will continue as before. Discrimination is possible.

On the other hand, the maximum value detector 8 detects the time when the track side voltage reaches its maximum. The time measuring device 9 measures the time from when the change detector outputs a pulse to when the maximum value detector outputs, and when controlling the phase setting,
The signal is input to the time delay setting device through the AND gate 10, and the time delay can be automatically set. Figure 4 shows the time relationship. When measuring the time T _M until the track side voltage reaches its maximum, T _M is the time delay of the phase difference +90° from the local side voltage to the track side voltage. At this time, the time T _M ' until the track side voltage changes from negative to positive may be measured, and in this case, the time delay of the phase difference can be directly determined. T _M or T _M ′ can be automatically measured, and by storing this time in the time delay setting device, the time for subsequent internal generation of local side voltage is automatically corrected. be able to.

When digitizing the receiver, it is also possible to perform software processing on component circuits such as a time delay setting device using a microcomputer. In that case, the track side voltage will be sampled and input using an A/D converter.

When a large number of track circuits are concentrated in one place, such as in a station, a switch 11 is connected to the input and output of one set of receivers, as shown in FIG.
By simultaneously switching the switching devices synchronously using the input/output switching controller 14, one set of receivers can perform train detection on a large number of track circuits.

[Effects of the Invention] By computerizing it in this way, it is possible to automatically correct the phase of the local side voltage and track side voltage, which simplifies adjustment and furthermore allows many track circuits to be combined into one set. By switching and processing in the receiver,
It can be made smaller and cheaper.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 shows waveforms and timing of each part, and Fig. 3 shows waveforms of each part when the phases of track side voltage and local side voltage are different.
FIG. 4 shows the input timing of the phase setter, FIG. 5 shows the configuration of the track circuit time division processing, FIG. 6 shows the conventional equipment configuration, and FIG. 7 shows the equipment configuration when the phase adjuster is inserted. 1...Receiver, 2...Change detector, 3...Time delay setter, 4...Local side voltage waveform generator, 5...
... Multiplier, 6 ... Moving average processor, 7 ... Detection level comparator, 8 ... Maximum value detector, 9 ... Time measuring device, 10 ... AND gate, 11 ... Transmitter,
12... Track circuit, 13... Switch, 14... Input/output switching controller, 15... Track transformer, 16...
...Current limiting resistor, 17... Orbit relay, 18... Phase adjuster.

Claims (1)

[Claims] 1. Change detector 2, time delay setter 3, local side voltage waveform generator 4, multiplier 5, moving average processor 6, detection level comparator 7, orbital voltage It has a maximum value detector 8, a time measuring device 9, and an AND gate 10, and has a local voltage directly applied from the transmitter 11, and a track side voltage applied from the transmitter 11 via the track circuit 12. It is a binary track circuit receiver that operates when the phase difference of The time delay setter 3 inputs the output of the AND gate 10, sets and stores the delay time, and inputs the output of the change detector 2, delays the delay time signal, and automatically sets the local side voltage generation time. The local side voltage waveform generator 4 is used to adjust the time delay setting device 3.
The multiplier 5 is connected to the latter stage and generates a voltage with the same waveform as the local side voltage after a set time delay. A moving average processor 6 is connected after the multiplier 5 and performs moving average processing on the absolute value of the output of the multiplier 5. A detection level comparator 7 is connected after the moving average processor 6. The maximum value detector 8 inputs the track side voltage and detects whether there is a train in the track circuit by comparing the average voltage and a preset train detection level. The time measuring device 9 inputs the outputs of the change detector 2 and the maximum value detector 8 and calculates the difference between the time detected by the change detector 2 and the time detected by the maximum value detector 8. The AND gate 10 measures the time difference, inputs the output of the time measuring device 9 and the phase setting control input signal, and outputs a delay time signal which is the logical product of the two.A binary track circuit receiver.