JPS6060062A - Information transmission system of non-insulating track circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] In addition, in-train signals such as ATC signals can be effectively transmitted to on-board devices such as automatic train control devices for insulated track circuits or in-train signal devices (hereinafter collectively referred to as ATC). The purpose of the present invention is to provide an information transmission system for non-insulated track circuits that enables the following.

With the development and expansion of railway networks, there is a tendency for opportunities for mutual train connections with other railway companies to increase. One form of such mutual access is mutual access between railways using uninsulated track circuits and railways using paid edge track circuits, but trains equipped with ATC onboard equipment for paid edge track circuits When traveling on a track with an uninsulated track circuit system, as explained below, a stop signal is forced near each block boundary point of the uninsulated track circuit, causing a so-called plateauing phenomenon in which forward movement is impossible. There was a problem.

In other words, the conventional non-insulated track circuit is shown in Figure 1 (al), where 1 and 1' are the rails, 1T to 3T are track circuit sections constructed by the non-insulated method, Co is the resonant capacitor, and Zl is the track circuit section constructed by the non-insulated method. Z2 is a short circuit that exhibits a sufficiently low impedance only for a predetermined frequency signal F1; i′rs and 2TS are short circuits that exhibit a sufficiently low impedance only for a predetermined frequency signal F2; 2TRV and 3TRV are ATC ground receivers that receive the frequency signal F2 or Fl, respectively, and 2TR and 3TR are orbital relays.An example of the frequency signals F and F2 is shown in Fig. 2. As shown, it consists of an ATC signal and a train detection signal, and is obtained by performing rectangular wave amplitude modulation (AM) on carrier waves fC, (or fc2) using modulated waves fs1 to sn, fD.

In the illustrated example, the track circuit section IT, 3T has a carrier wave fc.
Frequency signal F1 consisting of + is still transmitted to track circuit section 2T, and frequency signal F2 consisting of carrier wave fCz is transmitted to track circuit section 2T, and the frequency signals of adjacent track circuit sections are configured to consist of different carrier waves. The short circuit Zl is connected to a position where a parallel resonant circuit composed of a rail inductance from the short circuit Z to the resonant capacitor C6 and the resonant capacitor C6 is in a parallel resonant state with respect to the frequency signal F1, and the short circuit The child Z2 is connected to a position where a parallel resonant circuit composed of the track inductance at the resonant capacitor Cot and the resonant capacitor C6 from the short circuit Z2 is in a parallel resonant state with respect to the frequency signal F, and each track circuit It is devised so that the frequency signal F or F2 transmitted to the section does not leak to the adjacent track circuit section due to the action of the parallel resonant circuit.

Figure 1 (bl is the power receiver 2, 2 of the ATC onboard equipment mounted on the train when the train T runs on the rails 1, 1' made of uninsulated track circuits in Figure 1 (al). indicates the reception levels of the frequency signals F1 and F2 received by the track circuit section.Normally, when there is no train 1 in the track circuit section, each track circuit section 1T to 3T is equipped with an ATC ground transmitter ITS,
2TS, ..., the train detection signal modulated by the modulated wave fD in Fig. 2 is transmitted to the tracks 1, 1 as the frequency signal F1 or F2.
The signal is transmitted to the track relays 2TR and 3TR to detect the absence of a train. For example, when the train T exists in the track circuit section 2T, the track relay 2TR falls due to a short circuit in the axle of the train, and as a result of the fall of the track relay 2TR, the ATC ground transmitter 2TS detects the train detection signal from the AT
C signal (see Figure 2) is switched to the sending state, and f is determined by the blocking state of the track circuit ahead of 2T.
The ATC signal modulated with one of the modulated waves of sl-fsn is sent to the track circuit section 2T as a frequency signal F2. The train T automatically controls the train speed etc. by receiving the frequency signal F2 consisting of this ATC signal with the power receiver 2.2. In this way, in the uninsulated track circuit system, when a train does not exist within a track circuit section, a train detection signal (the dotted line in Figure 1 fbl) is sent to the track circuit section, and the train detects When entering the circuit section, the track relays 2TR, 3TR, etc. are dropped and the signal is switched to the ATC signal (shown in solid line in FIG. 1 (solid line in BL)).

Figure 3 shows a block diagram of the ATC on-board device for uninsulated track circuits mounted on a train for uninsulated track circuits, and selects power receivers 2, 2', frequency signals Fl and p2. Bandpass filters BPF+ to BPF3 pass the carrier wave fc1. Cut fC2 and generate modulated wave fsl ”'-s
A demodulator DT+-DT3 that extracts n + fD, a low-pass filter LPF that blocks passage of the modulated wave fD that is the train detection signal, and an ATC that selectively detects the modulated waves fs1-fsn that are the ATC signals and operates the main relays IMR-nMR.
It consists of signal selection circuits SC+ to SCn.

On the other hand, Figure 4 is a block diagram of the ATC on-board equipment for the paid edge track circuit, and the ATC for the non-insulated track circuit in Figure 3
The only difference from the "car" device is that it does not include a low-pass filter LPF. By the way, the power receiver 2 in Figure 1 (bl)
, 2', it is clear that near the boundary points of each track circuit section 1T to 3T, the train detection wave shown by the dotted line is stronger than the ATC signal wave from the front track circuit section shown by the solid line. The reception level also increases. In the case of the ATC on-board device for uninsulated track circuits shown in Figure 3, a low-pass filter LPF that cuts the modulated wave fD for train detection prevents the negative influence of the modulated wave fD for train detection, but as shown in Figure 4. Since the ATC onboard equipment for insulated track circuits does not have a low-pass filter LPF that cuts fD, the high-level modulated wave fD for train detection received near the boundary point of each track circuit section causes Each limiter LT, ~LTn in the following ATC signal receiving circuit SC+~SCn
becomes saturated and becomes unable to receive the ATC signal sent from the track circuit section ahead, causing all of the main relays IMR-nMR of the on-board equipment to drop.

As a result, the train enters a stop signal state in which it is unable to move forward due to the failsafe system, resulting in a so-called plateauing phenomenon.

The present invention provides an information transmission system for non-insulated track circuits that does not cause non-insulated track circuits in trains equipped with ATC onboard equipment that is not equipped with an LPF as described above. , the present invention will be explained with reference to the drawings. In conventional uninsulated track circuits, both ATC signals and train detection signals are sent to the track circuit as amplitude modulated (AM) waves, as shown in Figure 2. Instead, the ATC signal is amplitude modulated (AM) similar to that in Figure 2.
The train detection signal is transmitted as a wave, but the train detection signal is shown in Figure 5 (al (
As shown in bl, carrier wave fCI (or fC2) is transmitted as a frequency modulated (FM) LkFM wave using modulated wave fD. When the train detection signal is changed from the conventional amplitude modulated wave (AM wave) to a frequency modulated wave (FM wave) and transmitted, the low filter LPF shown in Fig. 4 is transmitted.
(Refer to Figure 3) ATC on-board equipment for insulated track circuits detects the train detection signal consisting of the FM waves at the first q + a).
Even if the train detection signal is received near the boundary point of each track circuit section 1'F to 3T shown in (b), the train detection signal is an FM wave with a constant amplitude as shown in FIG. Even if it is demodulated by the wave demodulator DT+ or DT2, it is only output as a DC signal with a constant amplitude.Therefore, this DC signal is blocked in the subsequent AC amplifier AM, and the subsequent A
The signal cannot reach the TC signal selection circuit S C+ -S Cn, and the limiters LT l - LT n are no longer saturated as in the conventional case. For this reason, even if a train detection signal with a high level and an ATC signal from the front track circuit with a low level are received at the same n:J near the boundary point of each track circuit section, the high level train detection signal will be demodulated. IJ by the wave
The transmitters LT and ~LTn no longer become saturated as in the past, and only the ATC signal from the forward track circuit can be accurately received. 1) It is possible to prevent the so-called plateauing phenomenon in which it is impossible to run in the IJ direction. It is something.

05Cd is an oscillator of modulated waves fD for train detection signals; 03Cc is carrier wave f, c+(
or fC2)'s oscillator, SP is an ATC signal selection circuit that selects modulated waves fs1 to fsn as ATC signals, MOD
is the amplitude modulator, BrF3 is the frequency signal F2 (or F+
) is the At bandpass filter, RC is the frequency discrimination circuit FD, selection amplifier SA, lJ transmitter, and amplifier.

The train detection signal receiving circuit consists of a detector DT4, and TR is a track relay. Normally, when there is no train within the own track circuit section, the frequency of the oscillator O8C♀carrier fC1 (or fc2) is modulated by the modulated wave fD of the oscillator 03Cd as shown in Figure 5tb), and the frequency modulated wave is transmitted to the train. A detection signal is sent to the corresponding Will and rails of the road circuit section. When the train enters the relevant ML road circuit section, the track relay TR' (Fig. 7j, omitted) of the relevant track circuit section is restored due to the train's axle short circuit, and the oscillation 2:10SCd is caused by the fall of the contact TR'. When disconnected from 03Cc, the ATC signal oscillator O3 is connected to the same B, lj.
C+-05Cn is connected to the amplitude modulator MOD as an ATC signal selection circuit S valve. At this time, one of the modulated waves fsI-fsn is selected depending on the state of the front side track circuit such as the track relay TR of the ATC signal signal selection circuit S valve side track circuit. The amplitude modulator MOD amplitude modulates the carrier wave fc+c or fc2) of the oscillator 05Cc with the modulated wave selected by the ATC signal selection circuit sp, and generates an ATC signal consisting of the amplitude modulated wave shown in FIG. It is sent to the track circuit as an ATC signal.

In the above explanation, frequency modulation (
Although the present invention has been described with reference to the case where a phase modulated (FM) wave is employed, the purpose of the present invention can be achieved in exactly the same way even if a phase modulated (PM) wave is employed instead. and phase modulation (P-M) are collectively called angle modulation. Furthermore, the bandwidths of frequency modulation and phase modulation are selected to be appropriate bandwidths according to the bandwidth of the bandpass filter used and the resonance characteristics of the shunts and the like forming the uninsulated track circuit section.

As explained above, the present invention uses an amplitude modulated wave as an in-vehicle signal such as an ATC signal, and uses a frequency modulated or phase modulated angle modulated wave as a train detection signal. Even if a train carrying the device runs on a track made of an uninsulated track circuit system, it will no longer cause the so-called plateauing phenomenon in which it becomes unable to proceed forward near the boundary point of the track circuit section, unlike in the past. It has an excellent effect. Furthermore, since it can be used for on-board equipment for uninsulated track circuits without any problems in the same way as before, mutual access between railways with different track circuit systems is facilitated, and railway steel It is a dog that contributes to maintenance and expansion.

[Brief explanation of drawings]

Figure 1 (a) is a principle diagram of an uninsulated track circuit, Figure 1 (1)
) is a reception level diagram of the power receiver of the onboard equipment, Figure 2 is a waveform diagram of the ATC signal and train detection signal in a conventional uninsulated track circuit, and Figure 3 is a block diagram of the ATC onboard equipment for the uninsulated track circuit. 4 is a block diagram of the ATC onboard device for the paid edge track circuit, FIG. 5 (altb) is a waveform diagram showing an example of the modulation waveform of the train detection signal in the method of the present invention, and FIG. FIG. 2 is a block diagram showing an example of a ground device for an uninsulated track circuit constructed using the method of the present invention. 1.1: Rail, 2,2: Power receiver, T: Train, 1T~3T
: Track circuit section, ITS, 2TS: ATC ground transmitter, 2TRV, 3TRV: ATC ground receiver, 2TR, 3
TR: Track relay, LPF: Low-pass filter, O5
C+ -05Cn, 03Cd, 03Cc: Oscillator, MOD: Amplitude modulator, SP: ATC signal selection circuit, BPF: Band pass filter, RC: Train detection signal receiving circuit, TR: Track relay, Fl, F2: Frequency signal,
fsl-fsn: ATC modulated wave, fD motorcycle detection modulated wave fc+, fc2: carrier wave. Patent Applicant Nippon Signal Co., Ltd. Agent Rikichi Kawa Figure 3 SCn Figure 4 Figure 5 n Figure 6

Claims (1)

[Claims] When transmitting information such as automatic train control equipment or in-train signal equipment using non-insulated track circuits, amplitude modulated waves are used as in-train signals such as ATC signals sent from ground equipment to each track circuit section, and amplitude modulated waves are used to transmit information from ground equipment to each track circuit section. An information transmission method for non-insulated track circuits characterized by using angle modulated waves with constant amplitude as train detection signals transmitted to circuit sections.