JPH08201454A - Method and apparatus for measuring ground unit of automatic train stop system - Google Patents

Abstract

PURPOSE: To measure the resonance frequency and quality factor accurately regardless of the distance between a vehicle unit and a ground unit by detecting variation in the level of a pilot signal extracted from an induced voltage and then correcting the level of the induced voltage. CONSTITUTION: Output from a multiplex frequency signal oscillator 1 is applied to the transmission coil 5T of a vehicle unit 5 and a voltage is induced in the receiving coil 5R through electromagnetic induction between the coil 5T and a ground unit 6 coil and between the ground unit 6 coil and the receiving coil 5R. A circuit 11 then extracts a pilot signal component from the voltage thus induced and the pilot signal component is fed to a digital signal processor 12. The processor 12 operates 12A a level variation curve and a level correcting operation 12B is carried out based on the level variation curve before a fast Fourier transform 12c is carried out. Discrete spectral information thus operated is recorded 16 on a magnetic disc. An external computer interpolates the discrete spectra and operates a resonance frequency and a quality factor. With such arrangement, an accurate measurement can be realized even if the vehicle unit 5 moves to vary the distance to the ground unit 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring method and a measuring device for determining the quality of a ground control of an automatic train stop system (ATS) of a point control type, and more particularly to the resonance frequency of the ground control and the sharpness of resonance. TECHNICAL FIELD The present invention relates to an automatic train stop device for measuring (Q) and a measuring device and a measuring device for a ground element.

[0002]

2. Description of the Related Art An automatic train stop device that gives an alarm to a driver in the case of a stop signal or when the speed of a vehicle exceeds a speed limit and applies an emergency brake when the alarm is ignored is used in many line sections. It is equipped. As a method of giving information such as an alarm to a driver in such an automatic train stop device, it is composed of a coil and a plurality of capacitors selectively connected to the coil, and the capacitors connected to the coil are switched based on a signal condition. A point control method in which a resonance circuit called a ground element is provided at a predetermined position in the line section, and an alarm or a brake command is generated based on a signal from an onboard coil electromagnetically coupled to the ground element. It has been known.

In such an automatic train stop device, the resonance circuit components of the ground element are deteriorated, especially the coil of the ground element is deteriorated due to aging, and the resonance frequency of the ground element and the sharpness Q of the resonance are changed. For this reason, in order to maintain accurate automatic train stop control operation, an inspection vehicle equipped with a measuring device of the ground element that measures the resonance frequency of the ground element and the sharpness Q of the resonance is run every predetermined period, and Detects the deterioration of the child,
Maintenance such as replacing the coil of the deteriorated ground element is performed. However, due to the small number of inspection vehicles, the resonance frequency of the ground element and the sharpness Q of the resonance can be measured only once or twice a year.

On the other hand, as a conventional measuring device for a ground element, as disclosed in Japanese Patent Laid-Open No. 5-264617,
Apply a flat spectrum signal voltage up to a predetermined frequency to the car top coil, extract the signal generated in the car top coil when the car top coil and the ground core coil are electromagnetically coupled,
The analog-digital conversion is performed, the data is stored in the memory, the resonance frequency of the ground element and the resonance sharpness Q are calculated from the discrete spectrum obtained by performing the discrete Fourier transform of the data stored in the memory, and the deterioration of the ground element coil is calculated. It has been proposed to determine the degree of.

[0005]

With the above-mentioned conventional measuring device, the resonance frequency of the ground element and the sharpness Q of the resonance can be measured with high accuracy in a short time. Therefore, when the above-mentioned measuring device is mounted on an ordinary business vehicle to measure the resonance frequency of the ground element, it is possible to increase the number of measurements as compared with the conventional inspection vehicle. Furthermore, when the above-mentioned conventional measuring device is used, the occurrence of the measurement error is eliminated even if the distance between the vehicle upper piece and the ground piece is different at each measurement time. However, when the car top is facing the ground coil, the measurement can be performed well, but when the commercial vehicle is running, that is, the car core moves, the distance between the ground coil and the car core changes. However, there is a problem that the resonance frequency and the resonance sharpness Q cannot be accurately measured.

It is an object of the present invention to provide a measuring method and a measuring device capable of accurately measuring the resonance frequency and the sharpness Q of the resonance even if the distance between the car core and the ground core changes. .

[0007]

A method for measuring an automatic train stopping device grounding element according to the present invention applies a pilot signal of a predetermined frequency and a signal of a flat spectrum up to a predetermined frequency to a transmitting coil of a car top, The pilot signal is extracted from the voltage induced in the receiving coil of the car core by electromagnetic induction between the receiving coil of the car core and the coil of the ground coil, and the extracted pilot is based on the distance between the ground coil and the car coil. Detecting signal level fluctuations, correcting the level of the voltage induced in the receiving coil of the train car based on the level fluctuations of the pilot signal, and Fourier transforming the level-corrected induced voltage of the receiving coil. It is characterized in that the resonance frequency of the ground element and the sharpness of the resonance are calculated from the obtained discrete spectrum.

An automatic train stopping device grounding device measuring device according to the present invention comprises a multi-frequency generator for generating a pilot signal having a predetermined frequency and a signal having a flat spectrum up to a predetermined frequency, and applying the signal to a transmitting coil of a train car. A pilot signal extraction circuit that extracts a pilot signal from the voltage induced in the receiving coil of the car core by electromagnetic induction between the receiving coil of the car core and the coil of the ground coil, and between the ground coil and the car coil A detection circuit that detects a level fluctuation of the extracted pilot signal based on the distance, a correction circuit that corrects the level of the voltage induced in the receiving coil of the vehicle upper member based on the level fluctuation of the pilot signal, and the level-corrected A Fourier transform circuit for Fourier transforming the induced voltage of the receiving coil is provided, and the resonance frequency of the ground element and the resonance are obtained from the discrete spectrum obtained by the Fourier transform. And calculates the sharpness.

[0009]

According to the measuring method and the measuring device of the automatic train stopping device grounding device according to the present invention, the pilot signal of the predetermined frequency and the signal of the spectrum which is flat to the predetermined frequency are applied to the transmitting coil of the car upper member. A pilot signal is extracted from the voltage induced in the reception coil of the train car by electromagnetic induction between the reception coil of the vehicle and the coil of the ground coil. The level of the extracted pilot signal changes based on the distance between the ground child and the car upper child. The level fluctuation of the pilot signal is detected, and the level of the voltage induced in the receiving coil of the car top is corrected based on the level fluctuation of the pilot signal. The resonance frequency of the ground element and the sharpness of resonance are calculated from the discrete spectrum obtained by Fourier transforming the level-corrected induced voltage of the receiving coil.

Here, the degree of electromagnetic coupling between the transmitter coil and the receiver coil of the car core and the coil of the ground coil changes based on the distance between the car coil and the ground coil. Based on this, the induced voltage in the receiver coil of the car top changes, but this change in the coupling degree is affected only by the change in the distance between the car top and the ground element, not by the frequency. The level fluctuation is detected, the level of the voltage induced in the receiving coil of the car top is corrected based on the level fluctuation of the pilot signal, and the induced voltage after the level correction is Fourier-transformed. Since the change in the distance between the ground element and the ground element is compensated for, the resonance frequency and the sharpness of the resonance can be accurately calculated even if the distance between the onboard element and the ground element changes.

[0011]

The present invention will be described below with reference to examples. FIG.
FIG. 1 is a block diagram showing a configuration of an embodiment of an automatic train stop device grounding device measuring device according to the present invention.

Reference numeral 20 indicates the measuring apparatus of this embodiment. The output from the multi-frequency signal generator 1 is supplied to the D / A converter 2 and converted into an analog signal, and the output of the D / A converter 2 is supplied to the low pass filter 3 and the output of the D / A converter 2. The high frequency component in the inside is removed, the output from the low-pass filter 3 is supplied to the amplifier 4 and is amplified to a predetermined level, and the output of the amplifier 4 is applied to the transmission coil 5T of the car top 5 and transmitted.

As shown in FIG. 2, the multi-frequency signal generator 1 includes a pilot signal oscillator and (n-
1) An oscillator 1A including one oscillator and a combiner 1B for combining the outputs from the oscillator 1A are provided.
Each oscillator constituting A generates an oscillation output having a single frequency and an equal output level, and the oscillation output from the oscillator 1A is synthesized by the synthesizer 1B and output. Therefore, the frequency spectrum of the output of the combiner 1B is shown in FIG.
As shown in (a), it is a discrete spectrum having a flat level in a desired band. In this example, the oscillation frequency fp of the pilot signal oscillator is set to 116 kHz,
The oscillation frequency of each of the (n-1) oscillators is set to an oscillation frequency of 97 kHz to 113 kHz with a predetermined frequency interval and a frequency of 119 kHz to 137 kHz with a predetermined frequency interval.

The oscillating frequency of the oscillator 1A is selected in this way because the resonance frequency of the current ground element is 130 kHz,
This is because the frequencies are selected to 123 kHz, 108 kHz, and 103 kHz, and the frequency of the pilot signal is selected in the middle of the unused frequency range 113 kHz to 119 kHz so as to be easily extracted and away from other frequencies. .

In the above description, the multi-frequency signal generator 1 has been illustrated as having an analog structure, but the memory shown in FIG.
The data corresponding to the frequency spectrum shown in FIG. 3 is stored, the data is read from the memory and D / A converted to obtain a multiple frequency signal of the frequency spectrum shown in FIG. It can also be set to a physical structure.

As shown in FIG. 4, the train car 5 is provided with the transmitting coil 5T and the receiving coil 5R, and the degree of electromagnetic coupling between the transmitting coil 5T and the receiving coil 5R is set to "0". It does not bind to each other. On the other hand, the ground element 6, as shown in FIG. 4, is a switch S for switching the coil 6L, the capacitors 6C1 and 6C2, and the capacitors 6C1 and 6C2 based on a signal to connect them in parallel to the coil 6L.
It has and. Here, the coil 6L and the transmission coil 5T
The electromagnetic coupling between the coil 6L and the receiving coil 5R is set to be loosely coupled.

The voltage induced in the receiving coil 5R by the electromagnetic induction between the transmitting coil 5T and the coil 6L to which the output from the amplifier 4 is applied and the electromagnetic induction between the coil 6L and the receiving coil 5R is supplied to the amplifier 7. Is amplified based on a predetermined gain, and the output of the amplifier 7 is supplied to the bandpass filter 8 and band-limited. The output of the bandpass filter 8 is supplied to the A / D converter 9 and converted into a digital signal, and the output digital signal from the A / D converter 9 is supplied to the pilot signal extraction circuit 11 and the A / D converter is supplied. The pilot signal component is extracted from the output of 9.

The pilot signal extraction circuit 11 includes a local oscillator 11A, a down converter 11B, an FIR type digital low pass filter 11C and an FIR type digital band pass filter 11D.

In the pilot signal extraction circuit 11, the oscillation output from the local oscillator 11A and the output digital signal of the A / D converter 9 are frequency mixed and frequency-converted by the down converter 11B, and the A / D converted output is processed. It is lowered to a frequency that is easy to handle. Down converter 11B
The digital low-pass filter 11C that receives the output from the down converter 11B cuts off the high frequency side of the output of the down converter 11B and extracts the low frequency side including the pilot signal. The digital band pass filter 11D receiving the output from the digital low pass filter 11C extracts only the pilot signal frequency component from the output of the digital low pass filter 11C, and the pilot signal is extracted.

The output digital signal of the A / D converter 9 and the pilot signal extracted from the pilot signal extraction circuit 11 are supplied to the digital signal processor 12,
Level detection in the digital signal processor 12,
Signal processing for level correction and fast Fourier calculation is performed.

The digital signal processor 12 functionally responds to the level fluctuation curve calculation circuit 12A for calculating the level fluctuation curve of the pilot signal extracted from the pilot signal extraction circuit 11 and the output digital signal of the A / D converter 9. And a level correction calculation circuit 1 for performing a correction calculation based on the level fluctuation curve calculated by
An FFT operation circuit 12C that receives the output data of the level correction operation circuit 12B whose level has been corrected in 2B and performs a fast Fourier operation is provided.

The information of the discrete spectrum calculated by the digital signal processor 12 is supplied to a computer 14 cooperating with a memory 13 and recorded in a magnetic disk recording device 16 such as a floppy disk, which is provided outside the measuring device 20. The computer performs interpolation between the discrete spectra to calculate the resonance frequency 〃f0〃 and the resonance sharpness Q. The interpolation is performed by the least squares method or the spline interpolation.

Of course, the computer 14 can also interpolate between the discrete spectra calculated by the digital signal processor 12 to calculate the resonance frequency 〃 f0 〃 and the resonance sharpness Q.
Since 0 is mounted on a commercial vehicle, the calculation processing cannot be completed in time when traveling at high speed. Therefore, the information of the discrete spectrum calculated is temporarily stored in the memory 13, and 〃 f0〃 and the sharpness Q of the resonance are calculated from the spectrum information. When calculating, the information is further transferred to the magnetic disk storage device 16 and processed separately.

Since the measuring device 20 is mounted on the commercial vehicle, the relative position between the ground element 6 and the vehicle upper element 5 changes based on the running of the commercial vehicle, and the measuring element 20 is mounted on the vehicle on the vehicle. The induced voltage from the receiving coil 5R of the on-board child 5 increases as the child 5 approaches, becomes maximum when the on-board child 5 faces the position of the ground child 6, and decreases as the child moves away. Therefore, the level of the frequency spectrum of the output of the bandpass filter 8 increases as the position of the ground element 6 approaches, and as shown in FIG. 3B to FIG. Accordingly, as shown in FIG. 3C to FIG.

The level of the pilot signal extracted from the pilot signal extraction circuit 11 is similarly the ground element 6 and the vehicle element 5.
It changes based on the relative position with. As a result, the level fluctuation curve of the pilot signal, which is the result of calculation by the level fluctuation curve calculation circuit 12A, becomes as shown by the curve a shown by the solid line in FIG. In FIG. 5, the level is maximized at time t0 t0, which is when the car top 5 is facing the ground contact 6.

On the other hand, the output digital signal of the A / D converter 9 supplied to the level fluctuation correction calculation circuit 12B is corrected in the level fluctuation correction calculation circuit 12B based on the level fluctuation curve. Specifically, the level is corrected by multiplying the value of the curve b shown by the broken line in FIG. 5 which is symmetrical with respect to the curve a of FIG. 5 by the digital signal from the A / D converter 9. This correction is made because the degree of coupling between the ground element 6 and the vehicle upper element 5 depends only on the distance between the two and does not depend on the frequency.

The output from the level fluctuation correction calculation circuit 12B thus corrected is subjected to signal processing in the FFT calculation circuit 12C and Fourier calculation is performed.

Next, the measurement results in the case of this embodiment will be described in comparison with the case of the conventional example. In the present embodiment, the waveform of the voltage applied to the transmitter coil 5T of the train car 5 is as shown in FIG. 8 (a). The waveform of the output voltage from the receiving coil 5R of the car top 5 in response to this voltage is shown in FIG.
7B, the voltage waveform shown in FIG. 7A is level-corrected, and the result is as shown in FIG. 7B. This voltage waveform is Fourier-transformed, and as a result of interpolation processing, a resonance curve as shown in FIG. 7C is obtained. From this curve, as shown in FIG. 6, the resonance frequency 〃 f0 〃 is obtained from the frequency at the maximum level, and the frequencies 〃 f1 〃 and 〃 f2 showing the voltage at the level 3 dB lower than the maximum level.
From 〃, the sharpness Q of the resonance is obtained by f0 / (f1-f2).

When the resonance frequency "f0" changes over a predetermined range, or when the sharpness Q of the resonance falls below a predetermined value, it is judged that the ground element 6 has deteriorated and the ground element 6 is replaced. The maintenance of the ground element 6 can be performed, and the performance of the ground element 6 can always be maintained within the predetermined range.

In the case of the conventional example, the voltage waveform applied to the transmission coil 5T of the train top 5 is as shown in FIG. 8 (a), and if the pilot signal is ignored, it is the same as in the case of this embodiment. FIG.
As shown in FIG. 8B, the resonance curve when the voltage waveform of the receiving coil 5R is processed is as shown in FIG. 8C, and there is no problem in measuring the resonance frequency and the resonance sharpness Q. However, when the on-board child 5 moves and the relative distance from the ground child 6 changes, the voltage of the waveform shown in FIG. 9A, that is, the same voltage as the waveform shown in FIG.
When applied to T, the waveform of the output voltage of the receiving coil 5R is as shown in FIG. 9B, and its resonance curve is as shown in FIG. 9C, and a plurality of peaks are generated. As a curve, an error is likely to occur in the calculation of the resonance frequency 〃f0〃 and the resonance sharpness Q, and the reliability of the measurement result decreases.

As is clear from comparison between FIG. 7 and FIGS. 8 and 9, in the case of this embodiment, the level is corrected, so that the relative position between the ground element 6 and the vehicle upper element 6 changes. In the case of FIG. 8 of the conventional example, that is, in the same waveform as in the case where the ground element 6 and the top element 6 face each other, the resonance frequency 〃f0〃 and the resonance sharpness Q are accurately determined. As a result, the reliability of the measurement result does not decrease. As a result,
The measuring device 20 is installed in a commercial vehicle and the resonance frequency of the ground element is 〃
It is possible to accurately determine the change in f0, the deterioration of the resonance sharpness Q, that is, the deterioration of the ground element.

Further, according to this embodiment, since the level variation curve of the pilot signal is calculated, the level can be corrected based on the level of the pilot signal, and the pilot signal level variation curve is centered around the peak position of the level variation curve. By setting the range, it can be used for determining the FFT calculation range, such as setting the range as the FFT calculation range. Further, since the ground element 6 and the car top element 5 face each other at the peak position of the level fluctuation curve of the pilot signal, the information of the peak position of the level fluctuation curve is used to calibrate the position detection device of the commercial vehicle. can do. This is because the position of the ground element 6 is predetermined and the business vehicle position data is calibrated at the ground element position.

[0033]

As described above, according to the measuring method and the measuring device for the automatic train stop device ground element according to the present invention, the resonance frequency can be accurately set even if the distance between the car top element and the ground element changes. And the effect that the sharpness of resonance can be measured is obtained.

As a result, the automatic train stop device according to the present invention is installed in a commercial vehicle and the resonance frequency of the ground element and the sharpness of the resonance are measured to measure the quality of the ground element. The effect is that the interval can be shortened and the accurate automatic train stop control operation can be maintained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a measuring device for an automatic train stopping device ground element according to the present invention.

FIG. 2 is a block diagram showing a configuration of a multi-frequency signal generator in an embodiment of a measuring device for an automatic train stopping device ground element according to the present invention.

FIG. 3 is a schematic diagram showing a frequency spectrum of an output of a multiple frequency signal generator and a frequency spectrum of a received signal in an embodiment of a measuring device for an automatic train stopping device ground element according to the present invention.

FIG. 4 is a schematic diagram showing a configuration of an on-board member and a ground member in an embodiment of an automatic train stop device ground member measuring device according to the present invention.

FIG. 5 is a schematic diagram for explaining a level fluctuation curve in an embodiment of an automatic train stop device grounding device measuring device according to the present invention.

FIG. 6 is a schematic diagram showing a relationship between a resonance frequency and a sharpness of resonance.

FIG. 7 is a waveform diagram for explaining the operation of the embodiment of the automatic train stop device grounding device measuring device according to the present invention.

FIG. 8 is a waveform diagram for explaining the operation of the embodiment of the automatic train stop device grounding device measuring apparatus according to the present invention.

FIG. 9 is a waveform diagram for explaining the operation of the embodiment of the automatic train stop device grounding device measuring apparatus according to the present invention.

[Explanation of symbols]

 1 multi-frequency signal generator 2 D / A converter 3 low-pass filter 4 and 7 amplifier 5 car child 6 ground child 8 band-pass filter 9 A / D converter 11 pilot signal extraction circuit 12 digital signal processor 13 memory 14 computer 16 Magnetic disk storage device 5T transmission coil 5R reception coil 6L coil 11A local oscillator 11B down converter 11C digital low pass filter 11D digital band pass filter 12A level fluctuation curve calculation circuit 12B level fluctuation correction calculation circuit 12C FFT calculation circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Nagasaka 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Kenichi Shiraishi 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Inventor Toshiyuki Takegahara 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Inventor Shoichi Suzuki 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72 ) Inventor Shuichi Okamoto 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Inside Kenwood Co., Ltd.

Claims (3)

[Claims] Claim: What is claimed is: 1. A pilot signal having a predetermined frequency and a signal having a flat spectrum up to a predetermined frequency are applied to a transmission coil of a car top and the car top is electromagnetically induced by a reception coil of the car top and a coil of the ground core. The pilot signal is extracted from the voltage induced in the receiving coil of the vehicle, the level variation of the extracted pilot signal based on the distance between the ground element and the vehicle upper element is detected, and the onboard vehicle is detected based on the level variation of the pilot signal. The level of the voltage induced in the receiver coil of the child is corrected, and the resonance frequency of the ground child and the sharpness of the resonance are calculated from the discrete spectrum obtained by Fourier transforming the level-corrected induced voltage of the receiver coil. A method for measuring an automatic train stop device ground element. 2. A multi-frequency generator for generating a pilot signal having a predetermined frequency and a signal having a flat spectrum up to a predetermined frequency and applying the same to a transmitting coil of a car top, a receiving coil of the car top, and a coil of a ground coil. A pilot signal extraction circuit that extracts a pilot signal from the voltage induced in the receiving coil of the car top by electromagnetic induction, and a detection that detects the level fluctuation of the extracted pilot signal based on the distance between the ground wire and the car top A circuit, a correction circuit that corrects the level of the voltage induced in the receiving coil of the vehicle on the basis of the level fluctuation of the pilot signal, and a Fourier transform circuit that performs a Fourier transform of the level-corrected induced voltage of the receiving coil. And an automatic train stop device characterized by calculating the resonance frequency of a ground element and the sharpness of resonance from a discrete spectrum obtained by Fourier transform The upper child of the measuring device. 3. The automatic train stop device grounding device measuring device according to claim 2, wherein the pilot signal extraction circuit includes frequency conversion means for converting the frequency of the pilot signal to the low frequency side. Train stop device Measuring device for ground elements.