JPS5839304B2 - Shiyariyouichikenchihoushiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention installs a delay guide line along a vehicle operating route, and detects the phase difference caused by the delay of the modulated wave current transmitted between two predetermined points on the guide line. The present invention relates to a vehicle position detection method for detecting a position, and aims to realize vehicle blocking using electromagnetic induction vehicle detection, which has a high degree of security and does not involve construction difficulties.

In recent years, many new urban transportation systems developed and constructed for the purpose of increasing transportation capacity between cities or within cities have been developed with vehicle structures that use rubber tires for wheels for reasons such as preventing vehicle noise and improving ride comfort. The general trend is to aim for high-performance, high-frequency transportation modes.

As a result of this trend, the control of trains or vehicles (hereinafter referred to as vehicles) that accompany them on railway lines has become more sophisticated, and autonomous driving is expected.

However, in order to implement automatic control and autonomous driving of this type of vehicle, it is necessary to block the vehicles using continuous vehicle detection, which has excellent security, but vehicles that use rubber tires for their wheels do not have the same system as conventional railways. It is not possible to adopt a vehicle detection method using a so-called track circuit that uses iron rails as a component.

Therefore, the vehicle blocking system adopted in Morrail etc. installs loop coils on the vehicle operating route to set block sections, and uses electromagnetic induction to transmit and receive signals between the train and the ground. It used a so-called check-in/check-out vehicle detection method that detects the approach and departure of vehicles.

However, the conventional check-in/check-out method cannot continuously detect vehicles, so it has the drawback that it cannot ensure driving safety when implementing automatic vehicle control, automatic driving, etc.

The present invention provides a delay guide line at a required section length along a vehicle route, and supplies a carrier wave current modulated with a modulated wave for train position detection to this guide line.

The phase of this modulated wave is delayed little by little as it propagates through the guide line, but the guide line is configured so that the phase delay when the modulated wave supplied to one end of the guide line propagates to the other end is less than π. , the degree of phase delay is determined by the distance from the modulated wave supply point.

Modulated waves are placed on different carrier waves from both ends of the guide line configured in this way, and transmitted toward the other end so as to generate the predetermined phase difference, and these two modulated waves are received onboard the vehicle. The phase difference between both harmonics is detected, and the vehicle position is determined from the phase difference.

In this way, the vehicle position is continuously detected.

Embodiments of the method and apparatus of the present invention will be described below with reference to the drawings. FIGS. 1, 2, and 3 are explanatory diagrams of the basic configuration and principle of the present invention.

DL in Figure 1 is A along the traveling route of vehicle T. A pair of delay induction wires are installed between points B and 2. In the figure, a carrier current fc1 modulated by a modulating wave fM is transmitted from point A to the guiding wire DL, and a carrier current fc2 modulated by a modulating wave fM is transmitted from point B to the guiding wire DL. By electromagnetic induction, the receiving antenna RA of the vehicle T
FIG.

The delay characteristics of the guide wire DL are set so that the phase delay when the modulated wave fM supplied to point A propagates through the guide wire DL and reaches point B is less than or equal to π.

Similarly, the modulated wave fM supplied to point B also has a phase delay of π or less at point A.

For the sake of simplicity, a case will now be described in which the phase delay at both ends of points A and B is π.

In the case of Figure 1, the transmitter at point A transmits carrier wave fc1
: The phase of the modulated wave fM and the point B where the carrier wave fc2 is transmitted
The mutual phase relationship is set so that the phase of the modulated wave fM of the transmitter has a certain relationship.

For example, as shown in FIG. 2, a transmitter at point B transmits modulated wave fM from point A toward point A in accordance with the phase of modulated wave fM from point A at point B.

That is, for convenience of explanation, if the modulated wave fM from point A is f2, then the phase difference between modulated waves f1 and f2 at point B is π
So, the phase difference at point A is 2π,
If j is set so that this phase relationship is maintained steadily, point A is obtained by finding the phase difference 〆X.

The position X between B can be detected.

Figure 3 shows the modulated wave fM, that is, the carrier wave fc1, which is transmitted and received at points A, B, and X, and the carrier wave fc.
2 is a waveform diagram showing the phase relationship of modulated waves f2, and the phase difference between modulated waves f1 and f2 received at arbitrary point X is 〆X
It is.

In FIG. 1, a vehicle T receives carrier waves fcl and fc2 modulated as described above by a receiving antenna RA, and converts the carrier waves fcl by an on-vehicle converter TC.

Separate and demodulate fc2 and use a phase comparator to generate modulated waves f1 and f
The phase difference lX of 2 is taken out laterally, converted into a vehicle position signal, and transmitted from the transmitting antenna SA to the ground via the delay guide line DL.

Based on the vehicle position information received by the ground receiver in this manner, the vehicle behind the vehicle is blocked in the same manner as in the conventional method.

The basic principle of the present invention has been outlined above.

Next, a specific application example of FIG. 1 will be explained with reference to FIG. 4.

DL in the same figure is D placed at a certain interval between points A and B.
GA is a ground device at point A, which generates an oscillator MO1 carrier wave fc1 of modulated wave fM, and A modulator AM that modulates a carrier wave with a modulation wave fM, a transmitter AS that transmits the modulated carrier wave fc1 from point A to the delay guide line DL, a receiver AR that receives the modulated carrier wave fc2 at point B, Demodulator A of carrier wave fc2
D, a receiver MR for the demodulated modulated wave fM, a phase comparator GPC, etc.

GB is the ground equipment at point B, and the modulated carrier f
Receiver BR1 of c1; demodulator BD of carrier wave fc1; modulator BM that generates carrier wave fc2 and modulates carrier wave fc2 with modulated wave fM demodulated by demodulator BD; It consists of a transmitter BS etc. that transmits data from point B to delay guide line DL.

The on-board conversion device TC includes a receiver T that receives the modulated carrier waves fc1 and fc2 via the on-board receiving antenna RA.
R, demodulator TD1 of carrier wave fc1, demodulator TD2 of carrier wave fc2, phase comparator TPC1 of modulated wave fM demodulated by demodulators TD1 and TD2, converts the phase difference detected by the phase comparator TPC into a vehicle position signal. The signal converter SC1 includes a transmitter TS, etc., which transmits the vehicle position signal to the delay guide line DL via the transmitting antenna SA.

To explain the function and operation of realizing this method using the above-mentioned ground and on-board equipment, the modulator AM of the ground equipment GA
and modulated wave fM (hereinafter f1) generated by oscillator MO
A carrier current fc1 modulated by a transmitter AS from a point A to a delay induction line DL is delayed by delay elements DI, D2, . . . , Dn, and propagates to a point B.

The carrier wave fc1 propagated to point B is received by the receiver BR of the ground equipment GB and demodulated by the demodulator BD.
The output becomes a modulated wave fM (hereinafter referred to as f2) whose phase is delayed from the modulated wave f1.

This modulated wave f2 modulates the carrier wave fc2 generated in the modulator BM, and supplies the modulated wave from point B to point A to the delay guide line DL via the transmitter BS and the delay element.

The carrier wave fc2 propagated to point A is received by the receiver AR of the ground equipment GA, and its modulated wave f2 is extracted by the demodulator AD, passes through the modulated wave receiver MR, and is sent to the phase comparator GPC.
, the difference in phase with the modulated wave fM from the oscillator MO, ie, fl, is compared.

As mentioned above, the delay guide line DL is configured so that the phase delay of the modulated wave propagating between points A and B is less than or equal to π.

Figure 5 shows the configuration shown in Figure 4 using a total of five delay elements, four in the guidance line and one in the output circuit of the ground equipment GB, and at point A.
This shows the phase between points A and B when the phase difference between the modulated wave f2 received at the same point and the modulated wave f1 transmitted from the same point is 2π.

As shown in the figure, the phase changes stepwise depending on the position of the delay element.
By measuring the phase difference y at an arbitrary point y between points A and B, it is possible to detect the section where the vehicle is present.

The receiver TR of the on-board conversion device TC is the on-board receiving antenna RA.
The carrier waves fc1 and fc2 are simultaneously received through the demodulators TD1 and TD2, and the respective carrier waves fci l
The modulated waves f1 and f2 are extracted by selectively demodulating fc2, and the phase difference y between the two harmonics is detected by a phase comparator TPC.

The detected phase difference y is converted to A- in the signal converter SC.
Through the D conversion, it is converted into a digital signal corresponding to each arrangement section of the delay elements DI, D2, D2, . It is sent to

Vehicle position signals transmitted to the ground are received by the ground controller by commonly used means.

The control logic processing device of the ground control device inputs the vehicle position signal under the condition that the phase comparator GPC determines that the phase difference between the modulated waves f1 and f2 at point A is in a predetermined state. Based on this, a processing action for blocking the approach of a rear vehicle is performed.

Note that the phase comparator GPC detects the modulated waves f1 and f at point A.
2 and corrects the phase of the oscillation modulated wave of the oscillator MO so as to maintain a predetermined phase difference.

As described above, in an electromagnetic induction vehicle detection system, the present invention configures a delay guide line so that the modulated waves supplied have a required phase difference, and the delay guide line is configured so that the phase difference between the modulated waves supplied from both ends of the guide line is adjusted. By on-board detection, it is possible to continuously detect the position of a vehicle traveling along the delay guidance track, and it overcomes the drawbacks of the conventional electromagnetic induction vehicle detection method using check-in and check-out. This eliminates the problem, increases the degree of security, and makes it possible to realize vehicle blockade in automatic control, automatic driving, etc.

[Brief explanation of drawings]

The drawings relate to an embodiment of the vehicle position detection method of the present invention, and FIG. 1 is a basic configuration diagram for explaining the vehicle position detection method of the present invention, FIG. 2 is a diagram showing the relationship between phase difference and position as described above, and FIG. is a modulated wave waveform diagram showing the relationship between each point and the modulated wave phase;
The figure is a block diagram of an apparatus showing an application example of the present invention, and FIG. 5 is a diagram showing the relationship between the phase difference and position of the same. A, B...Both end points of section length, DL...
Delay induction line, D, DI, D2...Dn...
...Delay element, GA, GB... Ground equipment, T
C, TM...on-vehicle device, fM...modulated wave, fcl y fc2...carrier wave, ZX, 〆y...phase difference.

Claims (1)

[Claims] 1. In the electromagnetic induction vehicle detection method, which detects vehicles by supplying signals to a guide line laid along the route of the vehicle and transmitting and receiving information between the vehicle and the ground, a modulated wave with a constant waveform is used for the supplied signal. , the delay guide line is configured such that this modulated wave causes a predetermined phase delay of π or less in a predetermined section length, and this modulated wave generates a phase difference that changes depending on the position within the section length. Lay it over the length of the section,
The modulated waves are placed on different carrier waves from both ends of the delay induction line and transmitted toward the other end so as to generate the predetermined phase difference, and these two modulated waves are received onboard the vehicle to achieve both pitches. A vehicle position detection method characterized by detecting a phase difference between waves and determining a vehicle position from the phase difference.