JPS6013865B2 - Multi-information transmission device to vehicles - Google Patents

Description

[Detailed Description of the Invention] This invention relates to so-called variable frequency automatic train stopping (abbreviated as ATS).
) device, it is related to a multi-information transmission device that uses the onboard antenna (onboard antenna) to transmit information from a different system than the ATS from the ground to the onboard vehicle, and this device does not affect the functions of the ATS. The purpose is to provide a seed device.

The so-called variable frequency ATS device is a resonant circuit called a ground element that resonates at a predetermined frequency on the track at the required braking distance point behind the point where the train is stopped.
An oscillation circuit that generates a signal with a required frequency difference with respect to the resonant frequency of the ground element, and a pass band filter for the signal are installed on the vehicle as part of an on-board antenna oscillation circuit that is made up of two loosely coupled coils. The on-board device is equipped with an on-board device consisting of a master relay driven by the signal and a brake control circuit controlled by this master relay, and when the on-board antenna passes over the ground wire, The oscillation frequency changes in the direction of the resonant frequency of the ground element, the master relay is restored, and the brake control circuit is driven to automatically stop the train.

The above is an overview of the variable frequency ATS device, but recently this AT
By sharing the on-board antenna of the S device, or rather by borrowing it, apart from the original ATS function, various information is sent from the ground to the on-board vehicle.For example, when a train stops at a station or passes through the station at low speed, A multi-information transmission system has been proposed that encodes and transmits communication information from the ground to the train, such as information that was written on pieces of paper and handed over from staff to crew members.

The following types of multi-information transmission systems have been proposed to date.

In other words, a ground loop antenna different from the above-mentioned ground element is installed at a required information transmission point on the track, independent of the ATS device, and a signal having the same frequency as the constant oscillation frequency of the above-mentioned ATS on-board oscillation circuit is used as a carrier wave. , this is frequency modulated (F
A transmitting circuit is installed on the ground to perform phase modulation (PM) or phase modulation (PM), code the required information, and send it out, and transmit the coded signal to the on-vehicle antenna via the ground loop antenna.
Onboard the vehicle, the modulated wave signal from the ground is separated from the constant oscillation output of the ATS and demodulated to extract information. As described above, this type of information transmission system utilizes a frequency-variable ATS device, so it is a prerequisite that the original function of the ATS device is not impaired. Therefore, in the above proposal, ``Even if a signal with the same frequency as the ATS on-board oscillation frequency is used as the carrier wave for information transmission, the
Measures are being taken to maintain the operation of the TS master relay. However, for this reason, "the frequency band of the carrier wave is AT
S The constant oscillation frequency of the on-board oscillator circuit is regulated by the outside of the passband filter, which limits the transmission speed, so there is a drawback that high-speed transmission is not possible.Also, as mentioned above, the same frequency as the on-board constant oscillation frequency is transmitted. When used as a carrier wave for transmission, even though an above-ground loop antenna is not installed, for example, when a train runs on a trackbed made of iron, such as a slab trackbed or iron railing, the onboard antenna may be affected by the trackbed. There are drawbacks such as the possibility that the oscillation frequency on the vehicle will fluctuate due to the change in the oscillation frequency of the ATS device, and that the oscillation frequency fluctuation due to the aging of the ATS device may move within the frequency band and generate a false demodulation output. The present invention has been made to eliminate the above-mentioned drawbacks by time-sharing multi-information transmission, allocating the carrier wave for the transmission among the harmonics of the constant oscillation frequency on the variable-frequency ATS vehicle, and transmitting it to FM or It is PM modulated and combined with a signal with a constant oscillation frequency equal to the ATS oscillation frequency and transmitted from the ground to the on-vehicle antenna via the ground loop antenna,
This system extracts received information at high impedance from the primary coil of the on-board antenna via a transformer, and also stops multi-information transmission when the ground constant oscillation frequency signal is not output, providing a fail-safe system for the device. It has a function.

Embodiments of the present invention will be described below with reference to the drawings.

Block circuit diagrams of the ground equipment and Urama onboard equipment are shown in the block diagrams surrounded by two-dot chain lines in the drawing. The CD of the ground equipment 1 encodes various information S input from the input terminal PT into predetermined codes. At the same time, the coder "MD" has a logic function that outputs coded information in a time-divided manner. A modulator that modulates this carrier wave into FM or PM using the output code of the coder CD and outputs it. A terrestrial constantly oscillating frequency oscillator that generates a signal with a frequency equal to the oscillation frequency of the oscillation frequency circuit CS, AM is a transmission multiplier, EF is an oscillation frequency pass band filter of the oscillator ES, LD is a bell detector, LDR Hedge bell detector LD
The output relay HYB is a hybrid transformer that mixes the output signal of the oscillator ES and the output signal of the modulator MD and sends the mixed signal to the ground loop antenna EA via the matching transformer EMT. Note that even if the contact 1 is inserted into the output circuit of the modulator MD, the contact 1 is a contact of the relay LDR. The on-vehicle antenna CA of the on-vehicle device 0 has a primary coil nail and a secondary coil si loosely coupled to form a part of the oscillation circuit CS. Then, the constant oscillation frequency signal of the circuit CS goes back through the pass band filter CFI and is rectified by the rectifier RF, and is rectified by the master relay M.
It operates as an ATS by constantly driving the town. In addition, the CMT inserted in the connection circuit between the primary coil pj of the on-board antenna CA and the oscillation circuit CS is a transformer whose output side has high impedance, and the CF2 connected to the output side of the MT is connected to the transformer.
is the passband filter of the carrier wave modulated by the modulator MD on the ground; Rainbow M is the demodulator; Red C is the decoder; this series of circuits constitutes the main part of the on-board receiving circuit of this device. . Note that the above-mentioned on-vehicle receiving circuit can be constructed using existing technology. Next, we will explain the operation of this device.
As already mentioned, in a variable-speed ATS device, unless the on-board oscillation frequency changes due to the action of the ground element of the device, the on-board master relay MR should remain in operation at all times, so this is not the case. Needless to say, the installation of the device must not affect the operation of the master relay M.

Therefore, this device is provided with an oscillator ES on the ground that generates a signal of the same frequency as the oscillation frequency of the oscillation circuit CS on the vehicle, and a signal of this frequency is constantly radiated from the ground loop antenna EA via the hybrid transformer HYB. The on-vehicle loop antenna CA passing over the loop antenna EA receives the ground signal, but since this receiving frequency is equal to the on-vehicle constant oscillation frequency, the master relay M remains energized and does not recover. .Furthermore, when the output of the ground oscillator ES is above a certain level, the output signal is passed through the bandpass filter EF.
, a relay LDR is operated through the level detector plate, and the output signal of the modulator MD is superimposed on the output signal of the oscillator ES by the hybrid transformer HYB via the operating contact LDR of this relay LDR, and is transmitted from the ground loop antenna EA. The signal is transmitted to the on-board loop antenna CA. The superimposed signals transmitted on the vehicle are separated by filters CF and CF2, one of which acts on the old position of master relay M as described above, and the other, that is, the code for ground information transmission of this device. The signal passes through the filter CF2, is demodulated by the demodulator DM, and is decoded by the logic mechanism of the decoder DC.The structure and operation of the present invention have been explained above, but there are also various parts that are effective in carrying out the present invention. , I mentioned earlier that the information transmission carrier wave from the ground to the vehicle in this device is distributed between the high frequencies of the constant oscillation frequency of the frequency-variable ATS on-vehicle.This means that the on-vehicle loop antenna CA A.T.
With the existing one for S, its natural resonance frequency and other factors that affect the harmonic components are determined by the ATS bag layer, so it cannot be set unconditionally. Since the band width is not particularly restricted, it is possible to set a frequency band with a high transmission speed.For example, the information transmission speed of the above conventionally proposed device that uses the ATS on-board oscillation frequency as the multi-information transmission carrier wave is 240
Although it is less than 0 (baud), the device of the present invention has a
High-speed transmission of 00 (po) or higher is possible. In addition, in this light installation, a level detector LD with a filter EF and its output relay LDR are installed on the ground to detect the output level of the oscillator ES. Since the signal is transmitted on the vehicle, if the constant oscillation frequency signal generated by the oscillator ES fails and the output level drops, the transmission path of the multi-information signal is cut off by the restoration of relay 10R, and only the multi-information signal is transmitted. It has a fail-safe function that prevents transmission to the vehicle from becoming an obstacle to restoring the master relay MR on the vehicle.

Furthermore, regarding the two waves transmitted from the ground to the vehicle, that is, the oscillation frequency signal of the oscillator ES and the information transmission signal output from the modulator MD, it is sufficient that the former is at a relatively higher level than the latter. , since it is not restricted to an absolute level, it is possible to set the ground current to a level diagram with a sufficient signal-to-noise ratio (S value) above the level diagram of the information transmission signal.

As described above, the multi-channel transmission device of the present invention exhibits a much greater effect than the above-mentioned conventionally proposed transmission devices of this type.

[Brief explanation of the drawing]

The drawing is a block diagram of a device showing a circuit configuration for realizing a multi-information transmission device to a vehicle according to the present invention.

Claims (1)

[Claims] 1. In a multi-information transmission system in which ground loop antennas for multi-information transmission are installed at required points on the railway track and information is transmitted from the ground to onboard the train using the on-board antenna of the frequency-variable automatic train stopping device. , a series of circuits for generating a signal with a frequency equal to the constant oscillation frequency on the vehicle of the above-mentioned stopping device and detecting the output level of the signal; A series of circuits that modulate a carrier wave with a frequency distributed between waves with the information code, and a circuit that combines the modulated output of this circuit with the signal on the condition that the output level is detected and sends it to the above-mentioned terrestrial loop antenna. a passband filter for the carrier wave transmitted via a transformer inserted in a circuit connected to the on-board antenna, and a series of circuits for demodulating the modulation code of the carrier wave passing through this filter and decoding the information. What is claimed is: 1. A multi-information transmission device for a vehicle, characterized in that it is provided with an on-vehicle device consisting of.