JPH08332954A - Alarm system for rolling stock - Google Patents

Abstract

PURPOSE: To use the same transmission device for each railway vehicle without performing separate setting work, and substantially completely prevent a communication impossible condition. CONSTITUTION: A timing signal generator 17 generates timing signals which indicate timings which are changed at random substantially without periodicity to be continuous with each other. A modulator 14 and a drive circuit 18 drive and control an infrared ray generator 19 to emit infrared rays which are modulated in accordance with the same information only in a specified period after each timing indicated by the timing signal corresponding to the timing signal from the timing signal generator 17, and prohibit emission of the infrared ray in other periods than the specified period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for infrared space transmission for railway vehicles, an infrared space communication apparatus for railway vehicles using the same, and an alarm system for railway vehicles using the same.

[0002]

2. Description of the Related Art For various purposes, it is conceivable to perform communication between railway vehicles that are close to each other or between a railway vehicle and a ground facility such as a part beside a railroad track. It is conceivable to perform space infrared communication.

As one example thereof, the inventor of the present invention invented the alarm system for railway vehicles shown in FIG. This warning system for railway vehicles is provided when the following vehicle 3 approaches the preceding vehicle 2 in order to prevent the following vehicle 3 following the preceding vehicle 2 on the same track 1 from colliding with the preceding vehicle 2. And is configured as an alarm system for issuing an alarm to the driver of the following vehicle 3.

As shown in FIG. 9, the preceding vehicle 2 is equipped with a transmitter 4 including an infrared light emitter 4a, and the infrared light emitter 4a is installed at the rear of the preceding vehicle 2 in the traveling direction X. The transmitting device 4 emits infrared rays modulated according to vehicle information (transmission information) such as identification information (vehicle number) of the preceding vehicle 2 and identification information (track number) of a running track. Further, the receiving device 5 including the infrared light receiver 5a is mounted on the following vehicle 3, and the infrared light receiver 5a moves in the traveling direction X.
Is installed in the front part of the following vehicle 3. The receiving device 5 obtains vehicle information based on the received infrared rays. Further, whether or not the received vehicle information indicates that the own vehicle 3 may collide with the preceding vehicle (ie, the track number in the received vehicle information indicates that the own vehicle is running). Judgment unit 9 for judging whether or not a line is present
And an alarm device 10 for issuing an alarm to the driver or the like when the determination unit 9 determines that there is a possibility.

Further, the receiving sensitivity (including the transmission output) of the received infrared rays is only when the own vehicle 3 approaches the preceding vehicle 2 to a predetermined approach limit inter-vehicle distance.
It is set to receive vehicle information from.
Therefore, basically, reception of the vehicle information means that the own vehicle 3 has approached the preceding vehicle 2 by a predetermined approach limit inter-vehicle distance. However, the vehicle information may be received from the vehicle 7 or the like running in parallel on the adjacent track 6, and in this case,
If the vehicle information is not determined, an erroneous alarm will be issued even though there is no possibility of a rear-end collision. Therefore,
In order to prevent such a false alarm, the vehicle information is transmitted and the received vehicle information is determined by the determination unit 9 as described above.

According to the alarm system shown in FIG. 9, not only the driver of the following vehicle 3 visually monitors the taillights of the preceding vehicle 2 and runs so as not to collide with the preceding vehicle 2,
When the own vehicle 3 approaches the preceding vehicle 2 too much, an alarm is automatically received, so that the safety can be improved.

Although not shown in the drawings, since the vehicle travels in both directions, both a transmitter and a receiver are actually provided at the front and rear portions of each vehicle, and the vehicle travels according to the traveling direction. The receiver located at the front of the direction and the transmitter located at the rear of the direction are activated.

Such an alarm system is also provided for the adjacent vehicle 7. That is, the vehicle 7 is also equipped with the transmitter 8 including the infrared emitter 8a that is identical to the transmitter 4 including the infrared emitter 4a.
a is provided at the rear of the vehicle 7. However, the vehicle information transmitted by the transmitter 8 is different from the vehicle information transmitted by the transmitter 4.

As can be seen from the above description, the vehicle information is repeatedly transmitted from the transmitters 4 and 8. However, when the vehicle information is continuously repeatedly transmitted from the transmitters 4 and 8, FIG. When there is a vehicle 7 on the adjacent track 6 that runs in parallel with the preceding vehicle 2, the infrared light receiver 5a of the following vehicle 3 emits the infrared light from the infrared light emitter 4a and the infrared light from the infrared light emitter 8a at the same time. Infrared rays are always received in duplicate. Therefore, in the case as shown in FIG. 9, the receiving device 5 of the following vehicle 3 cannot always correctly receive the vehicle information, and communication becomes impossible.

[0010] Of course, in the transmitter 4 and the transmitter 8,
Modulate electric signals of carrier waves of different frequencies with vehicle information,
The infrared light emitters 4a and 8a are arranged to change the intensity of the infrared light from the infrared light emitters 4a and 8a according to the modulation signal.
Even if the infrared light receiver 5a simultaneously receives the infrared rays from the infrared light emitters 4a and 8a, the vehicle information of both can be separated and correctly received. However, in that case, a railroad vehicle does not always travel on the same track and the number of railroad vehicles is large. Therefore, the frequencies of carrier waves of electric signals between vehicles that can run in parallel are adjusted according to the situation. Setting them differently
The cost is inevitable if the transmitter is constructed so that it is extremely complicated in actual use and is liable to be erroneously set, and that such a setting is possible. As described above, it is required that the transmission devices for railway vehicles be the same in all the vehicles and that the individual settings regarding the carrier frequency are not changed.

Therefore, as shown in FIG. 10, the present inventor repeats the transmission period T ₀ at a predetermined cycle T, and emits infrared rays modulated according to vehicle information (identical information) during each transmission period T _0. It is recalled that the transmitters 4 and 8 are configured so that infrared rays are not emitted during periods other than the transmission period T ₀ . In addition, FIG.
11 is a time chart showing a transmission period T ₀ of FIG.
(B) is a time chart showing the transmission period T ₀ of the transmitter 8. In this case, even in the case as shown in FIG. 9, the probability that one transmission period T _{0 of} the transmission devices 4 and 8 does not overlap with the other transmission period T ₀ is high, that is, communication is impossible. The probability of becoming is small.

[0012] However, in this case, can not be synchronized to the transmission period T ₀ of the transmission period T ₀ the transmitter 8 of the transmitter 4, as shown in FIG. 10, also, the transmission device 4 sometimes the transmission period T ₀ of the transmission period T ₀ the transmitter 8 will partially overlap. In such a case, since the repeated transmission period T ₀ of the transmission period T ₀ also transmitting device 8 of the transmission device 4 in the same period T, all the transmission period T ₀ will overlap each other, completely incommunicable Will be.

Therefore, in this case, the own vehicle 3
Although the vehicle approaches the preceding vehicle 2 too much, no warning is given and the warning system is not always sufficient.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to use the same transmitting device for each railroad vehicle without making individual settings, and in addition, it is possible to prevent communication failure. An object of the present invention is to provide an infrared space transmission method and device for a railway vehicle that can be substantially completely prevented, an infrared space communication device for a railway vehicle using the same, and an alarm system for a railway vehicle using the same.

[0015]

In order to solve the above-mentioned problems, an infrared space transmitting method for a railway vehicle according to a first aspect of the present invention is to emit infrared rays modulated according to desired information to the outside from a railway vehicle, A railcar infrared space transmission method for transmitting the desired information from the railcar to the outside of the railcar, wherein a transmission period is repeated, and infrared light modulated according to the same information is emitted during each transmission period, Infrared rays are not emitted during a period other than the transmission period, and the start timing of the transmission period is changed randomly with substantially no periodicity.

In the infrared space transmitting method for a railway vehicle according to the second aspect of the present invention, infrared rays modulated according to desired information are emitted from the railway vehicle to the outside, and the desired information is transmitted from the railway vehicle to the railway vehicle. It is an infrared space transmission method for railway vehicles that transmits outside, repeating the transmission period,
Infrared light modulated according to the same information is emitted during each transmission period, and the infrared light is not emitted during periods other than the transmission period, and the time equal to or slightly longer than the transmission period is T _0. In the case where the reference timing is assumed to be ', and N · T ₀ ' (N is an integer of 3 or more) is used as the repetition period T, the reference timing and each of the reference timings are sequentially T ₀ 'in each period T. At least one timing out of N timings consisting of shifted timings is randomly selected, and each cycle T
In the above, the selected timing is used as the start timing of the transmission period.

In the infrared space transmitter for a railroad vehicle according to the third aspect of the present invention, infrared rays modulated according to desired information are emitted from the railroad vehicle to the outside, and the desired information is transmitted from the railroad vehicle to the railroad vehicle. An infrared space transmitter for a railway vehicle for transmitting to the outside, comprising: an infrared light emitting device mounted on the railway vehicle; and a timing signal generation for generating a timing signal indicating sequentially succeeding timing that is randomly changed without substantially periodicity. And emitting infrared light modulated according to the same information only during a predetermined period from each timing indicated by the timing signal in response to the timing signal, and not emitting infrared light during a period other than the period, Means for driving and controlling the infrared light emitter.

In the infrared space transmitter for a railroad vehicle according to the fourth aspect of the present invention, infrared rays modulated according to desired information are emitted from the railroad vehicle to the outside, and the desired information is transmitted from the railroad vehicle to the railroad vehicle. An infrared space transmitting apparatus for a railroad vehicle for transmitting to the outside, wherein the infrared light emitting device mounted on the railroad vehicle has a time equal to or slightly longer than a transmission period of the desired information T _0. 'age,
Assuming reference timings in which N · T ₀ ′ (N is an integer of 3 or more) is used as a repeating period T, the reference timings and timings sequentially shifted by T ₀ ′ with respect to the reference timings in each period T Timing signal generating means for randomly selecting at least one timing of the N timings consisting of and generating a timing signal indicating the selected timing in each cycle T; While emitting infrared rays modulated according to the same information only during a predetermined period from each timing indicated by the timing signal, not to emit infrared rays during periods other than the period,
Means for driving and controlling the infrared light emitter.

An infrared space communication device for a railway vehicle according to a fifth aspect of the present invention is an infrared space transmission device for a railway vehicle according to the third or fourth aspect, and a railway mounted on another railway vehicle or ground equipment. An infrared space receiver for a vehicle, comprising: an infrared receiver for receiving the infrared light; and means for obtaining information indicated by the infrared light received by the infrared receiver based on an output signal of the infrared receiver. Infrared space receiver for use.

A railway vehicle alarm system according to a sixth aspect of the present invention is a railway vehicle infrared space transmitter according to the third or fourth aspect, and a railway vehicle infrared space receiver mounted on another railway vehicle. An infrared space receiving device for a railroad vehicle, comprising: an infrared light receiver for receiving the infrared light; and means for obtaining information indicated by the infrared light received by the infrared light receiver based on an output signal of the infrared light receiver. When,
An alarm unit that is mounted on the other railway vehicle and that issues an alarm when the information indicated by the infrared rays received by the infrared receiver is predetermined information.

[0021]

According to the present invention, the transmission period is repeated, the infrared light modulated according to the same information is emitted during each transmission period, and the infrared light is not emitted during the period other than the transmission period, so that the transmission period is started. Since the timing is changed randomly without substantially periodicity, even if the transmission period of one transmission device and the transmission period of the other transmission device overlap in the situation as shown in FIG. The probability that the two transmission periods overlap will gradually decrease, and eventually the probability will become substantially zero.

Therefore, according to the present invention, it is possible to use the same transmitting device for each railroad vehicle without making individual settings, and it is possible to substantially completely prevent the incommunicable state.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An infrared space transmitter for a railway vehicle according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing the configuration of an infrared space transmitter for railway vehicles according to an embodiment of the present invention.
FIG. 2 is a diagram showing a data structure of frame data.
FIG. 3 is a waveform diagram of each part in FIG. FIG. 4 is a diagram showing the relationship between the timing signal and the frame transmission period T ₀ .

This transmitting apparatus includes an information setting device 11, a frame data creating section 12, and a frame data storing section 13.
1, a modulator 14, a timing signal generator 17, a drive circuit 18, and an infrared light emitter 19 such as an infrared LED.

The information setting device 11 is for setting desired information to be transmitted by the user. In this embodiment,
The user can use the information setting device 11 to set the vehicle number (vehicle identification information) of the railway vehicle on which the transmission device is mounted and the track on which the railway vehicle travels so that it can be used in a railway vehicle alarm system described later. The track number (track identification information) can be set. However,
In the present invention, the information to be transmitted is not limited to this.

The frame data creation unit 12 creates the frame data shown in FIG. 2 based on the vehicle number and the track number set by the information setting unit 11, and stores this frame data in the frame data storage unit 13. In this embodiment, this frame data includes a frame end code (STX) 21 indicating the end of the frame, a track number code 22, a vehicle number code 23, and a frame end code (ETX) 24 indicating the end of the frame. The frame check code 25 is used to check whether the data received by the receiving device is transmitted without error. Each code is composed of a plurality of bits and has a fixed length as a whole frame. Also,
The frame data is transmitted in order from the code on the left side in FIG.

In the present embodiment, the modulator 14 comprises a clock signal generator 15 and a frame data read-out unit 16. The clock signal generator 15 constantly supplies a clock signal (FIG. 3A) having a predetermined frequency to the frame data reading unit 16. In this embodiment, the transmission rate is determined by the frequency of this clock signal. The frame data reading unit 16 includes a timing signal generator 17
In response to the timing signal shown in FIG. 3A, the reading of the frame data stored in the frame data storage unit 13 is started. Frame data reading unit 1
6 starts reading, the clock signal (see FIG.
In accordance with (a)), a read signal is sequentially supplied to the frame data storage unit 13, the frame data is read one bit at a time for each clock of the clock signal from the bit of the code on the left side in FIG. 2, and the read signal ( The serial signal) (FIG. 3C) is supplied to the drive circuit 18.
Further, the frame data reading unit 16 completes the reading of the frame data (this completion can be known by counting the clock signal, for example, because the frame data has a fixed length). The output is stopped (Fig. 3 (c)). A period T _{0 from} when the frame data reading unit 16 starts reading the first bit of the frame data to when the reading of the last bit is completed is a frame transmission period (FIG. 3D). Note that FIG. 3D is a time chart showing the frame transmission period.

In the drive circuit 18, when the read signal (FIG. 3 (c)) from the frame data read section 16 is at "1" level, the infrared light emitter 19 emits infrared light of a predetermined intensity and at the "0" level ( In this example, even when the frame data is not obtained from the frame data reading unit 16, the infrared light emitter 19 is at the “0” level.)
The infrared light emitter 19 is driven so that the light source does not emit infrared light.

The timing signal generator 17 generates a timing signal indicating a timing that sequentially changes in a random manner with substantially no periodicity, and supplies the timing signal to the frame data reading section 16. In this embodiment, as shown in FIG. 4A, a time slightly longer than the frame transmission period (FIG. 3D, which is the same as FIG. 4B) T ₀ is set as T ₀ ′, Assuming the reference timing t ₁ with 6T ₀ ′ as the repeating cycle T, in each cycle T,
The reference timing t ₁ and the timings t ₂ and t sequentially shifted by T ₀ ′ (= T / 6) from the reference timing t ₁ .
One of the six timings consisting of ₃ , t ₄ , t ₅ , and t ₆ is randomly selected (this selection can be made by, for example, generating a random number), and in each cycle T A timing signal (FIG. 4A) indicating the selected timing is generated. However, in the present invention, an integer of 3 or more can be used instead of "6" described above. Further, in the present invention, a timing signal indicating a sequentially succeeding timing which is randomly changed without substantially periodicity may be generated without using such a method.

For example, if a timing signal is generated at the timing shown in FIG. 4A in each cycle, in response to this, the frame transmission period T is generated according to the relationship already described with reference to FIG. ₀ is as shown in FIG.

Next, a device that can be combined with the transmitting device shown in FIG. 1 to form a railway vehicle alarm system according to an embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing the configuration of this device.

As shown in FIG. 5, this device comprises a receiving device 31. The receiving device 31 includes an infrared receiver 32 such as an infrared photodiode, a demodulation unit 33 that demodulates the data indicated by the infrared light received by the infrared receiver 32,
The reception determination unit 34 is included. The reception determination unit 34 determines whether or not the demodulated data has an error, and when there is no error, the reception determination unit 34 supplies the received line number code and vehicle number code to an alarm determination unit 37 described later. This error determination is performed by error detection based on the above-mentioned frame check code, or by a parity check or the like whether or not the track number code or vehicle number code is in a predetermined format.

The apparatus shown in FIG. 5 further includes an information setting device 35, a collation data storage unit 36, and an alarm determination unit 37.
And an alarm device 38. These are used to give an alarm based on the received data,
These elements are not needed if the received data is used for other purposes.

The information setting device 35 stores information on conditions for the user to give an alarm, for example, a track number code on which a railway vehicle equipped with the device shown in FIG.
It is for setting as collation data for collating with the received data. The collation data set by the information setting device 35 is stored in the collation data storage unit 36. The alarm determination unit 37 collates the received track number code and vehicle number code with the code stored in the collation data storage unit, and a vehicle equipped with the device shown in FIG. 5 may collide with a preceding vehicle. It is determined whether or not there is (that is, whether or not the track number in the received vehicle information indicates the track on which the own vehicle is traveling). When it is determined that there is a possibility of a rear-end collision, the alarm device 38 issues an alarm to the driver or the like.

Next, the operation of the alarm system for a railway vehicle in which the transmitter shown in FIG. 1 and the device shown in FIG. 5 are combined will be described with reference to FIGS. 6 and 7.

FIG. 6 is an explanatory diagram showing this alarm system for railway vehicles. In FIG. 6, reference numeral 41 indicates the transmitting apparatus shown in FIG. 1, and reference numeral 42 indicates the apparatus shown in FIG.

In this warning system for railroad vehicles, in order to prevent the following vehicle 52 following the preceding vehicle 51 on the same track 54 from colliding with the preceding vehicle 51, the following vehicle 52 is set to the preceding vehicle 51. It is configured as an alarm system that issues an alarm to the driver or the like of the following vehicle 52 when approaching.

As shown in FIG. 6, the preceding vehicle 51 is shown in FIG.
The transmitting device 41 shown in FIG. 2 is mounted, and the infrared light emitter 19 of the transmitting device 41 is installed in the rear part of the preceding vehicle 51 in the traveling direction X. A device 42 shown in FIG. 5 is mounted on the following vehicle 52, and the infrared receiver 32 of the device 42 is installed in the front part of the following vehicle 52 in the traveling direction X.

The reception sensitivity (including the transmission output) of the infrared rays received is that the frame data from the preceding vehicle 51 is received only when the host vehicle 52 approaches the preceding vehicle 51 to a predetermined approach limit inter-vehicle distance. It is set so that you can.

According to the alarm system shown in FIG. 6, the driver of the following vehicle 52 not only drives the trailing light of the preceding vehicle 51 by visual observation and runs so as not to hit the preceding vehicle 51, but also the own vehicle. When 52 is too close to the preceding vehicle 51, an alarm is automatically received, so that the safety can be improved.

Although not shown in the drawings, since the vehicle travels in both directions, both a transmitter and a receiver are actually provided at the front and rear of each vehicle, and the vehicle travels according to the traveling direction. The receiver located at the front of the direction and the transmitter located at the rear of the direction are activated.

Such an alarm system is also provided for the adjacent vehicle 53. That is, the transmission device 41 shown in FIG.
The infrared light emitter 19 is provided at the rear of the vehicle 53. However, the line number code and the vehicle number code of the frame data transmitted by the transmitting device 41 mounted on the vehicle 53 are the line number code and the vehicle number code of the frame data transmitted by the transmitting device 41 mounted on the vehicle 51. Different from

Then, as shown in FIG. 6, the preceding vehicle 51
If there is a vehicle 53 on the adjacent track 55 that runs in parallel with
The infrared light receiver 32 of the following vehicle 52 receives the infrared light from the infrared light emitter 19 of the vehicle 51 on the same track 54 and the infrared light from the infrared light emitter 19 of the parallel running vehicle 53 on the adjacent track 55.

However, in the transmitter 41 shown in FIG. 1, the frame transmission period T ₀ is repeated and each frame transmission period T ₀ is repeated.
Together emit infrared modulated according to the same frame data during the during the period other than the frame transmission period T ₀ without emitting infrared, substantially periodic unchanged randomly the start timing of the frame transmission period T ₀ since thereby, in a situation as shown in FIG. 6 described above, even if one of the frame transmission period T ₀ of a frame transmission period T ₀ and the other of the transmitter 41 of the transmitter 41 is duplicated, the next time both frame The probability that the transmission periods T ₀ overlap will gradually decrease, and eventually the probability will become substantially zero.

Specifically, for example, the frame transmission period T ₀ (FIG. 7A) of the transmitter 41 mounted on the preceding vehicle 51 on the same track 54 and the parallel running vehicle 53 on the adjacent track 55.
The frame transmission period T _{0 of the} transmitter 41 mounted on the
The relationship with (b)) is as shown in FIG. 7, for example.
7A is a time chart showing the frame transmission period T ₀ of the transmitter 41 mounted on the preceding vehicle 51 on the same track 54, and FIG. 7B shows the parallel running vehicle 53 on the adjacent track 55. The frame transmission period T _{0 of the} mounted transmitter 41
2 is a time chart showing. Since the operations of the respective transmitters 41 are not synchronized, the reference timing t _{1 of} both transmitters 41 is not synchronized.
And the reference timing t ₁ 'is deviated. In this example,
The first two frame transmission periods T ₀ happen to overlap each other, but the third frame transmission period T ₀ does not.

Therefore, in the present embodiment, the same transmitting device can be used for each railroad vehicle without making individual settings, and the incommunicable state can be substantially completely prevented. Therefore, even in the situation as shown in FIG. 6, when the own vehicle 52 approaches the preceding vehicle 51 too much, an alarm is automatically given, so that the safety can be further improved.

Next, a transmitting apparatus according to another embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing the configuration of the infrared space transmitter for a railway vehicle according to this embodiment. 8, constituent elements that are the same as or correspond to the constituent elements shown in FIG. 1 are assigned the same reference numerals.

The transmitting device according to this embodiment is different from the transmitting device shown in FIG. 1 mainly in that a modulator 70 is added between the frame data reading unit 16 and the drive circuit 18 in the modulating unit 14. Is.

[0050] In this embodiment, the frame data read section 16 reads the signal (see FIG. 2 (c)) other supplies to the modulator 70, the start signal and a frame transmission period T ₀ of a frame transmission period T ₀ as described above To the modulator 70. Modulator 70 during the period from receiving a start signal of a frame transmission period T ₀ until it receives an end signal of the frame transmission period T ₀ (i.e., frame transmission period T ₀₎ only, ASK according to the read signal, FSK, PS
A predetermined modulation operation such as K, PFM, PWM, or PAM is performed, and the modulation operation is stopped during a period other than the frame transmission period T ₀ and a zero level (a level at which the infrared light emitter 19 does not emit infrared light) is output. In the drive circuit 18, according to the modulation signal output from the modulator 70, during the frame transmission period T ₀ , the infrared light emitter 19 emits infrared light having the intensity according to the modulation signal, and the frame transmission period T _0.
During the periods other than the above, the infrared light emitter 19 is driven so that the infrared light emitter 19 does not emit infrared light.

The transmitting apparatus shown in FIG. 8 also has the same advantages as the transmitting apparatus shown in FIG.

When the transmitter shown in FIG. 8 is used instead of the transmitter shown in FIG. 1, the receiver 31 shown in FIG.
The demodulation unit 33 may be modified to perform a demodulation operation corresponding to the modulation operation of the modulator 70.

Although the respective embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

For example, the transmitting device according to the present invention can be used for a space infrared communication device for a railroad vehicle for communicating between railroad vehicles or between a railroad vehicle and a portion (ground equipment) beside a railroad track. Also, the communication content is not limited to the identification information for alarm, and it can be used for communicating arbitrary information. This information includes all information generated in the vehicle that should be transmitted to other vehicles or ground equipment, such as the current running speed,
Includes current position coordinates and vehicle device fault information.

[0055]

According to the present invention, it is possible to use the same transmitter for each railroad vehicle without making individual settings, and it is possible to substantially completely prevent the incommunicable state.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an infrared space transmitter for a railway vehicle according to an embodiment of the present invention.

FIG. 2 is a diagram showing a data structure of frame data.

FIG. 3 is a waveform chart of each part in FIG.

FIG. 4 is a diagram showing a relationship between a timing signal and a frame transmission period T ₀ .

5 is a block diagram showing a configuration of an apparatus that can configure an alarm system for a railway vehicle according to an embodiment of the present invention together with the transmission apparatus shown in FIG.

FIG. 6 is an explanatory diagram showing an alarm system for a railway vehicle according to an embodiment of the present invention.

FIG. 7 is a diagram showing a relationship between a frame transmission period of one transmission device and a frame transmission period of the other transmission device.

FIG. 8 is a block diagram showing a configuration of an infrared space transmitter for a railway vehicle according to another embodiment of the present invention.

FIG. 9 is an explanatory diagram showing an alarm system for a railway vehicle, which is the basis of the present invention.

FIG. 10 is a diagram showing a relationship between a frame transmission period of one transmission device and a frame transmission period of the other transmission device.

[Explanation of symbols]

 11 information setting device 12 frame data creation unit 13 frame data storage unit 14 modulation unit 15 clock signal generator 16 frame data reading unit 17 timing signal generator 18 drive circuit 19 infrared light emitter 31 receiver 32 infrared receiver 33 demodulator 34 Reception determination unit 35 Information setting unit 36 Collation data storage unit 37 Alarm determination unit 38 Alarm device

Claims (6)

[Claims] 1. An infrared space transmission method for a railroad vehicle, wherein infrared rays modulated according to desired information are emitted from a railroad vehicle to the outside, and the desired information is transmitted from the railroad vehicle to the outside of the railroad vehicle. The transmission period is repeated, the infrared light modulated according to the same information is emitted during each transmission period, the infrared light is not emitted during periods other than the transmission period, and the start timing of the transmission period is substantially random with no periodicity. Infrared space transmission method for railway vehicles, characterized by: 2. An infrared space transmission method for a railroad vehicle, wherein infrared rays modulated according to desired information are emitted from a railcar to the outside, and the desired information is transmitted from the railcar to the outside of the railcar. The transmission period is repeated, and the infrared light modulated according to the same information is emitted during each transmission period, and the infrared light is not emitted during the period other than the transmission period. Assuming a reference timing in which a long time is T ₀ ′ and N · T ₀ ′ (N is an integer of 3 or more) is a repeating cycle T, in each cycle T, with respect to the reference timing and the reference timing, successively T ₀ at least one of timing of N timing consisting of 'each shift timing randomly selected, were the selected in each period T The start timing of the transmission period timing, infrared spatial transmission method for a railway vehicle, characterized in that. 3. An infrared space transmitter for a rail vehicle, which emits infrared rays modulated according to desired information to the outside of the rail vehicle and transmits the desired information from the rail vehicle to the outside of the rail vehicle. An infrared light emitting device mounted on the railway vehicle; a timing signal generating means for generating a timing signal indicating a timing that sequentially changes randomly with substantially no periodicity; and a timing signal indicated by the timing signal in response to the timing signal. And means for driving and controlling the infrared light emitter so that the infrared light modulated according to the same information is emitted only during a predetermined period from each timing and the infrared light is not emitted during a period other than the period. Infrared space transmitter for railway vehicles. 4. An infrared space transmitter for a railway vehicle, which emits infrared rays modulated according to desired information to the outside of the railway vehicle and transmits the desired information from the railway vehicle to the outside of the railway vehicle. An infrared light emitting device mounted on the railway vehicle and a time of the same length as or a slightly longer time than the transmission period of the desired information are set to T ₀ ′, and N · T ₀ ′ (N is an integer of 3 or more). ) Is assumed to be a repetition cycle T, at least one of N timings consisting of the reference timing and timings sequentially shifted by T ₀ ′ with respect to the reference timing in each cycle T Each timing is randomly selected, and each cycle T
A timing signal generating means for generating a timing signal indicating the selected timing, and emitting infrared light modulated according to the same information only during a predetermined period from each timing indicated by the timing signal in response to the timing signal. An infrared space transmitter for a railway vehicle, comprising: means for driving and controlling the infrared light emitter so as not to emit infrared light during a period other than the period. 5. An infrared space transmitter for a railway vehicle according to claim 3 or 4, and an infrared space receiver for a railway vehicle mounted on another railway vehicle or on a ground facility, wherein the infrared ray receiver receives the infrared rays. And a means for obtaining information indicated by infrared rays received by the infrared receiver based on an output signal of the infrared receiver,
An infrared space communication device for a railway vehicle, comprising: 6. An infrared space transmitter for a railway vehicle according to claim 3 or 4, and an infrared space receiver for a railway vehicle mounted on another railway vehicle, the infrared receiver receiving the infrared rays. An infrared space receiving device for a railroad vehicle having means for obtaining information indicated by infrared rays received by the infrared light receiver based on an output signal of the infrared light receiver; and the infrared light receiver mounted on the other railcar. An alarm system for a railway vehicle, comprising: an alarm unit that issues an alarm when the information indicated by the infrared light received by the device is predetermined information.