JPS6350672B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention installs a delay guide line along a vehicle operation 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 the position of a vehicle, and aims to realize vehicle blockage using electromagnetic induction vehicle detection, which is highly secure 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) operating on railway lines is becoming 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 with excellent security, but with vehicles using rubber tires for wheels, it is necessary to block the vehicles from each other using continuous vehicle detection. 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 block system used in monorails etc. installs loop coils on the vehicle operating route to set block sections, and uses electromagnetic induction to transmit and receive signals between the vehicle and the ground. It was based on a so-called check-in/check-out vehicle detection method that detects the entry and departure of vehicles. However, since the conventional check-in/check-out method cannot continuously detect vehicles, it has the disadvantage that it cannot ensure driving safety when implementing automatic vehicle control, automatic driving, etc.

According to the present invention, a delay guide line is provided at a required section length along a train route, and a carrier wave current modulated with a modulated wave for detecting a train position is supplied from above the vehicle 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 designed 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. so that the degree of phase delay is determined by the distance from the modulated wave supply point. A carrier wave modulated with a predetermined modulated wave is transmitted from the vehicle to the delay guide line configured in this way, the phase difference between the received modulated waves at both ends of the guide line is detected by a ground receiving device, and from this phase difference the carrier wave is detected by the vehicle. determine the position of In this way, the vehicle position is continuously detected on the ground.

Hereinafter, the vehicle position detection method of the present invention will be explained with reference to the drawings. In FIG. 1, T is the vehicle,
DL is a pair of delay guide lines installed between points A and B along the route of the vehicle T, and the vehicle T is equipped with an on-board transmitter TM that outputs a carrier wave _C modulated by a modulated wave _M. An on-board transmitting antenna SA is provided for transmitting a carrier wave _C modulated by a modulated wave _M to the delay guide line DL.

On the other hand, ground receiving devices GA and GB are provided at both ends of the delay guide line DL, respectively, for receiving the modulated carrier wave _C sent from the on-board transmitting antenna SA and extracting only the modulated wave _M.
The respective modulated waves _M obtained by the ground receivers GA and GB are sent to a phase comparator TPC, which detects the phase difference between the two modulated waves and generates a vehicle position signal according to the phase difference. It is configured to output x. Here, it is assumed that the delay induction line DL employed in the present invention has the following delay characteristics. That is, the delay characteristics are set so that the phase delay when the modulated wave _M supplied to point A propagates through the delay guide line DL and reaches point B is less than or equal to π. Therefore, similarly, the modulated wave _M supplied to point B also has the same phase delay at point A, which is less than π.

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, as shown in FIG. For convenience of explanation, the modulated wave _M received by the ground receiving device GA at point A is assumed to be 1, and the modulated wave _M received by the ground receiving device GB at point B is assumed to be 2.
Then, point A and point B of the modulated waves 1 and 2
The phase difference at is π, respectively, and if this phase relationship is maintained steadily, the transmission position of the modulated wave _M between points A and B, that is, the vehicle position x, can be found by finding the phase difference φx. can.

Therefore, the carrier wave _C modulated by the modulated wave M is transmitted from the on-board transmitting device TM of the vehicle T to the delay guide line DL via the on-board transmitting antenna _SA , and is transmitted to the ground receivers installed at points A and B. The modulated wave _M received by the devices GA and GB is extracted, the phase difference φx between the two modulated waves is detected by the phase comparator TPC, and this is converted into a vehicle position signal x and outputted, then the position of the vehicle T can be determined. It can be known continuously on the ground. Based on the position signal obtained in this way, the vehicle behind the vehicle is blocked in the same manner as in the prior art.

In the above explanation, the case is shown in which the phase change with respect to the position x of points A and B changes continuously as shown in FIG. may be arranged so that the phase of the modulated wave _M changes stepwise with respect to the position x.

As described above, in an electromagnetic induction vehicle detection system, the present invention configures a delay guide line so that the modulated waves to be supplied have a required phase difference, and transmits the modulated waves on a carrier wave from onboard the delay guide line. By receiving the modulated waves at both ends of the delay guide line and detecting the phase difference between the modulated waves received at both ends, the position of the vehicle traveling along the delay guide line can be determined from the phase difference. This technology eliminates the shortcomings of the conventional electromagnetic induction vehicle detection method using check-in/check-out, increases the level of security, and makes it possible to realize vehicle blockade in automatic control, autonomous driving, etc. This is what I did.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram for explaining the vehicle position detection method of the present invention, and FIG. 2 is a diagram showing the relationship between the phase difference of modulated waves and the vehicle position in the same. A, B: Both end points of a predetermined section length, DL: Delay guide line, T: Vehicle, TM: On-board transmitter, SA:
On-board transmitting antenna, GA, GB: ground receiving device,
TPC: Phase comparator, _M : Modulating wave, _C : Carrier wave,
x: Vehicle position, φx: Phase difference.

Claims (1)

[Claims] 1. In the electromagnetic induction vehicle detection method, which detects vehicles by supplying signals to a guidance track 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 as a signal to be supplied, and this modulated wave causes a predetermined phase delay of π or less in a predetermined section length, and this modulated wave changes in accordance with the position within the section length. A delay guide line was configured and laid over the section length so as to cause the delay guide line, and the modulated wave was transmitted on a carrier wave from onboard the delay guide line, and the modulated wave was placed at both ends of the delay guide line. A vehicle position detection system characterized in that a ground receiving device receives each modulated wave, detects a phase difference between both modulated waves, and determines the position of the vehicle from the phase difference.