JP6967820B2 - Control system - Google Patents

Description

The present invention relates to a control system, and in particular, a control system capable of increasing the amount of information by a train control device or the like that performs amplitude modulation on a carrier wave, transmits control information, and acquires and controls the control information on a receiving side device. Regarding.

As an example of the control system, an automatic train control device (hereinafter referred to as "ATC device") will be described. In the ATC device, speed limit information (ATC signal) is transmitted from the ground device to the on-board device of the train via rails and the like. The ATC signal is generally created by modulating the carrier wave with a modulated wave assigned to the speed limiting information. The number of modulated waves corresponds to the number of speed limiting information, but a large number cannot be used due to the limitation on the receiving circuit of the on-board device.

In the case of a configuration using a carrier wave of one frequency as a method of increasing the number of modulated waves, that is, a method of increasing the number of information (for example, "speed limiting information", generally "control information"), for example, amplitude. A method has been proposed in which a carrier phase difference for each adjacent modulated wave period in a modulated carrier is changed and the amount of change in the carrier phase difference is set as information. This method is disclosed in, for example, Patent Document 1. Two different transport frequencies are prepared, the two transport frequencies are amplitude-modulated with the modulation signal assigned to each information, the signal is identified on the receiving side, and a large amount of information is obtained by the combination of the identified modulation signals. Is also used.

The invention disclosed in Patent Document 1 relates to an ATC device. In this ATC device, the ground device on the transmitting side is provided with a phase modulation processing means for modulating the phase of the carrier wave with the phase corresponding to the predetermined sub-information. The on-board device on the receiving side is configured to detect the carrier phase by the phase detecting means, extract sub-information, and control the train based on the sub-information.

Japanese Unexamined Patent Publication No. 2008-13043

In the invention of the ATC apparatus disclosed in Patent Document 1, when information is given, the phase of the carrier wave is changed at a certain angular interval, and the receiving side detects the phase difference between adjacent amplitude-modulated waves. The phase difference is used as one piece of information. This content. This will be specifically described with reference to FIG. FIG. 5 shows, as an example, a time-series sequence of amplitude-modulated waves M0 to M5 transmitted from the transmitting side to the receiving side. The six amplitude-modulated waves M0 to M5 are shown by the same waveform for convenience of illustration, but it is assumed that a constant phase difference θ actually occurs between two adjacent amplitude-modulated waves. That is, with the first amplitude-modulated wave M0 as a reference (0), it is constant between M0 and M1, between M1 and M2, between M2 and M3, between M3 and M4, and between M4 and M5, respectively. The change is made by the phase difference θ. As a result, when the phase difference θ is the same, the phase difference of the amplitude-modulated waves M1 to M5 with respect to the amplitude-modulated wave M0 changes as + θ, + 2θ, + 3θ, + 4θ, and + 5θ, respectively. Two amplitude-modulated wave M _{i adjacent,} the phase difference θ between M i + ₁ depends on the basis of the control situation, not necessarily the same. Thus adjacent two amplitude-modulated wave _{M i,} the phase difference θ between _{M i + 1,} as usually, a certain angle difference, for example, 0 ° (= θ1), 45 ° (= θ2), 90 It can be set as ° (= θ3), 135 ° (= θ4), and 180 ° (= θ5). In this case, for example, information on the train speed of 50 km / h is assigned to the phase difference θ1, information on the train speed of 55 km / h is assigned to the phase difference θ2, and control information is assigned. Thus, the two amplitude-modulated wave M _{i adjacent,} on the basis of the information of the phase difference θ between M i + _1, it is possible to perform train control.

According to the conventional control method of the ATC device disclosed in Patent Document 1, the amount of information can be increased, but there is a problem that the information cannot be further increased.

In view of the above problems, an object of the present invention is to provide a control system capable of further increasing the amount of information by controlling ATC or the like for setting speed control information or the like by using the amount of change in carrier phase difference. be.

The control system according to the present invention is configured as follows in order to achieve the above object.

The first control system (corresponding to claim 1) is
A carrier wave generator that generates a carrier wave and
A control information generator that generates a control information signal related to carrier phase setting and a control information signal related to modulated wave setting according to the set control information.
A first modulation unit that performs amplitude modulation processing on the carrier wave based on the control information signal related to carrier wave phase setting and sets the carrier wave phase for each amplitude modulation wave.
The carrier wave setting is performed based on the control information signal related to the modulation wave setting for the arrangement of a plurality of amplitude-modulated waves in the time series in the carrier wave amplitude-modulated by the first modulation unit, and the carrier wave between the adjacent amplitude-modulated waves is performed. It is provided with a second modulation unit that outputs a carrier wave modulated so as to include control information based on a plurality of code strings determined by a combination of the presence or absence of a phase difference between two or more carrier wave phases using the phase difference of the phase. Consists of.

In the above control system, control information is generated based on a plurality of code strings determined by the combination of the presence / absence (1 or 0) of two or more carrier phase differences, so that the type of information is based on the number of bits of the code string. It is possible to increase the amount of information to be transmitted.

In the above configuration, the second control system (corresponding to claim 2) preferably allocates control information by utilizing the phase difference of the carrier phase between the amplitude-modulated waves created by using the carrier of one frequency. It is a control system that transmits and receives the control information, and the second modulation unit is a plurality of codes determined by the combination of the phase difference of the carrier wave phase between the adjacent amplitude modulation waves in the sequence of at least three amplitude modulation waves generated in the time series. It is characterized by modulating the carrier wave to include control information based on each of the columns.

The third control system (corresponding to claim 3) is characterized in that, in the above configuration, the phase difference of the carrier phase between the amplitude modulated waves is preferably determined with reference to the unit phase angle.

The fourth control system (corresponding to claim 4) is characterized in that, in the above configuration, a plurality of unit phase angles are preferably prepared, and any one of them is used.

The fifth control system ( corresponding to claim 5 ) is characterized in that, in the above configuration, the sequence of amplitude-modulated waves is preferably selected by determining the first amplitude-modulated wave to serve as a reference.

The sixth control system ( corresponding to claim 6 ) is characterized in that, in the above configuration, the sequence of amplitude-modulated waves is preferably formed by five amplitude-modulated waves, and the code string is a 4-bit code string. And.

The seventh control system ( corresponding to claim 7 ) is characterized in that, in the above configuration, control information is preferably transmitted from a transmitting side device instructing control to a receiving side device including a controlled object. And.

In the eighth control system ( corresponding to claim 8 ), in the above configuration, preferably, the transmitting side device is a ground device and the receiving side device is an on-board device, and the control information is from the ground device to the on-board device. It is characterized in that it is speed control information transmitted to.

According to the present invention, control information is generated based on a plurality of code strings determined by the combination of the presence / absence (1 or 0) of two or more carrier phase differences, so that the type of information is based on the number of bits of the code string. Can be increased, and the amount of information to be transmitted can be increased.

It is a system block diagram which shows the whole structure of the control system which concerns on this invention. It is a block diagram which shows the detailed internal structure of the receiving side apparatus. It is a waveform diagram which shows an example of the time series arrangement of the amplitude modulation wave transmitted from the transmitting side to the receiving side. It is a phase angle change display pattern diagram for explaining the code string of the information numbers 1-8. It is a phase angle change display pattern diagram for explaining the code string of the information numbers 9 to 16. It is a waveform diagram which shows an example of the time series arrangement of the amplitude modulation wave transmitted from the transmission side to the reception side in a conventional train control system.

Hereinafter, preferred embodiments (Examples) of the present invention will be described with reference to the accompanying drawings.

A typical configuration of the control system according to the present invention will be described with reference to FIGS. 1 and 2. The control system 10 generates and transmits a carrier wave C1 (hereinafter referred to as "carrier wave C1") which is amplitude-modulated based on the modulation wave corresponding to the control information and phase-shift-keyed based on the amplitude modulation. It is composed of a device 11 and a receiving device 12 that receives the carrier wave C1 to extract control information and controls the controlled object 13 based on the control information. An example of the control system 10 is typically, for example, an ATC device. In this ATC device, as will be described later, in a time-series arrangement of a predetermined number of plurality of amplitude modulated waves on the carrier wave C1, the carrier phase difference for each adjacent modulated wave period is changed, and the amount of change in the phase difference is bit. This is a method in which the content of the code string is used as control information by replacing it with information. The control system according to the present invention is not limited to this type of ATC device, but can be applied to other types of ATC devices and control systems in fields other than the railway field.

As described above, the control system 10 includes a transmitting side device 11 and a receiving side device 12. In the case of an ATC device, the transmitting side device 11 is a ground device and the receiving side device 12 is an on-board device. The transmitting side device 11 and the receiving side device 12 are connected by a transmission line (not shown) for transmitting the carrier wave C1. The transmission line is, for example, a rail in the case of an ATC device. In the control system 10, the configuration of the transmission line is generally arbitrary. The transmission side device 11 is a device that transmits control information by the carrier wave C1. The receiving side device 12 receives the carrier wave C1 transmitted from the transmitting side device 11, extracts control information from the carrier wave C1, generates an output signal for control based on the control information, and gives it to the controlled object 13. The operation of the control target 13 is controlled based on the output signal for control. In the case of the ATC device, the control target 13 is a train, and the control information is the speed limit information of the train.

The transmitting side device 11 has a carrier wave generating unit 21, a first modulation unit 22, and a second modulation unit 23 connected in series, and further, each of the first modulation unit 22 and the second modulation unit 23 is individually ". A control information generation unit 24 that gives a signal related to "carrier phase setting" and a signal related to "modulation wave setting", and a control information setting unit 25 that sets control information and gives this control information to the control information generation unit 24. Be prepared. The control information generation unit 24 generates a control information signal related to the “carrier phase setting” and a control information signal related to the “modulated wave setting” based on the control information given from the control information setting unit 25.

The carrier wave generation unit 21 generates a carrier wave (reference signal) having a relatively high frequency (fc) and outputs it to the first modulation unit 22. The first modulation unit 22 performs amplitude modulation processing on the carrier wave based on the signal related to the “carrier phase setting” given by the control information generation unit 24. By this amplitude modulation processing, the carrier phase of each amplitude modulation wave is changed according to the control information. The carrier wave amplitude-modulated by the first modulation unit 22 is provided to the second modulation unit 23. The second modulation unit 23 based on the signal according to the "modulated wave setting" given from the control information generating unit 24, for a predetermined number of arrangement of a series of sequence of amplitude-modulated wave in the amplitude modulated carrier Performs modulation wave setting processing. The number of rows of amplitude-modulated waves is preferably 5, for example. The second modulation unit 23 outputs the carrier wave C1. The carrier wave C1 is a carrier wave that has been phase-shift-modulated based on control information.

When the first modulation unit 22 amplitude-modulates the carrier wave to generate the carrier wave C1, the control information generation unit 24 first modulates a signal related to control information for determining the carrier phase angle for each modulation wave period of the carrier wave C1. Give to 22. The control information generation unit 24 is a means for determining the content of the control information transmitted from the transmission side device 11 to the reception side device 12 via the first modulation unit 22 and the second modulation unit 23. When the first modulation unit 22 and the second modulation unit 23 generate a modulation signal based on amplitude modulation, the control content is determined by the carrier phase difference based on a predetermined number of amplitude modulations with respect to the control information to be transmitted to the receiving side. Will be done.

The receiving device 12 includes a demodulation unit 31 that demodulates the received carrier wave C1 and a control information extraction unit 32 that extracts control information from the demodulated signal. The demodulation unit 31 extracts a plurality of time-series amplitude-modulated waves including elements forming control information from the carrier wave C1. The control information extraction unit 32 acquires a code string representing control information based on a predetermined number of sequence of a plurality of amplitude-modulated waves in time series, extracts control information based on the code string, and obtains the control information. It is given to the control target 13.

The internal configuration of the receiving device 12 will be described in more detail with reference to FIG.

In FIG. 2, the carrier wave C1 phase-shift-modulated based on the amplitude modulation is input to the demodulation unit 31 of the receiving side device 12. The input carrier wave C1 is distributed and input to each of the modulated wave detection unit 33 and the phase angle detection unit 34. The modulated wave detection unit 33 detects only the modulated wave component of the amplitude-modulated carrier wave C1. Then, after that, the modulated wave identification unit 35 of the control information extraction unit 32 identifies the modulated wave based on the modulated wave component.

The phase angle detection unit 34 detects the phase angle (phase angle of the carrier wave) of each amplitude-modulated wave of the carrier wave C1. After that, the phase angle determination unit 36 determines the phase difference between the adjacent amplitude-modulated waves. The phase angle discriminating unit 36 preferably obtains a phase angle difference (carrier phase difference) between adjacent amplitude-modulated waves in an arrangement of five amplitude-modulated waves, and acquires four phase-angle differences. The information of these four phase angle differences is given to the next information identification unit 37. The information identification unit 37 uses the control information assigned to the code string based on the code string determined by the combination of the presence / absence (1 or 0) of the phase angle difference (carrier phase difference) based on the information of the four phase angle differences. Extract. The code string is formed as a 4-bit code string. The content of the control information is, for example, information related to speed, and more specifically, train speed limit information.

The identification result information output from the modulated wave identification unit 35 and the control information output from the information identification unit 37 are combined by the combination unit 38, and the content of the display is determined based on the combination result of the combination unit 38. , Is given to the control target 13 as an output signal for controlling the speed and the like.

In the above, as a device configuration of the receiving side device 12, the modulation wave detection unit 31 and the phase angle detection unit 34 in the front stage are realized by a DSP or the like (block 12A shown by the alternate long and short dash line), and the modulation wave identification unit 35 and the phase in the rear stage. The angle determination unit 36, the information identification unit 37, and the combination unit 38 are realized by the CPU (block 12B shown by the alternate long and short dash line). In the contrast relationship with the components of the receiving side device 12 shown in FIG. 1, the block 12A including the modulated wave detection unit 33 and the like corresponds to the demodulation unit 31, and the modulated wave identification unit 35 and the phase angle discrimination unit 35. The block 12B including 36 and the like corresponds to the control information extraction unit 32.

With reference to FIG. 3, an example of a time-series arrangement of amplitude-modulated waves transmitted from the transmitting side to the receiving side will be described.

As an example, six amplitude-modulated waves M0 to M5 are configured in the time-series arrangement of the amplitude-modulated waves. These six amplitude-modulated waves M0 to M5 are shown in the same waveform for convenience of illustration, but in reality, there is a certain phase difference between two adjacent amplitude-modulated waves, or there is a certain phase difference. , It is assumed that no phase difference has occurred. The representation of FIG. 3, in the example of arrangement of six amplitude modulation wave M0-M5, adjacent amplitude modulated wave _{(M i, M i + 1} : i = 0~4) with respect to the relationship between, between M0 and M1 are Amplitude difference θ1, phase difference θ2 between M1 and M2, phase difference θ3 between M2 and M3, phase difference θ4 between M3 and M4, and phase difference θ5 between M4 and M5, respectively. It is supposed to be. Specifically, the phase differences θ1 to θ5 are either “a constant phase difference has occurred” or “no phase difference has occurred”, respectively. "There is a constant phase difference" means that a constant carrier phase difference exists, and "no phase difference" means that the carrier phase difference is 0. Means. For the five phase differences θ1 to θ5, “yes” or “1” is assigned when “a certain phase difference occurs”, and “no” or “0” when “no phase difference occurs”. To assign. In this way, the first amplitude-modulated wave M0 is appropriately determined as the reference amplitude-modulated wave, and preferably, for example, by selecting the sequence of the five amplitude-modulated waves M0 to M4, the five amplitude-modulated waves M0 to M4 are used. A code string (a code string of 1 and 0) formed by the four generated phase differences θ1 to θ4 is created. The “constant phase difference” is, for example, 45 °, and the “no phase difference” is “0 °”. In the description of this embodiment, it is assumed that one angle difference "45 °" is preferably used as the "constant phase difference". This "constant phase difference" is defined as a "unit phase angle".

Next, with reference to Tables 1 and 2 below, and FIGS. 4A and 4B, based on the code sequences (code sequences 1 and 0) formed by the above four phase differences θ1 to θ4. The method of creating control information will be described in detail.

Table 1 shows a code sequence formed by the four phase differences θ1 to θ4 generated by the five amplitude-modulated waves M0 to M4 in terms of phase difference (constant angle difference). In this embodiment, "45 °" is used as a constant angle difference. In Table 1, four phase differences θ1 to θ4 are shown side by side in the horizontal direction as shown at the uppermost stage thereof. Further, 1 to 16 are indicated as "information No." in the vertical direction of Table 1. As shown in Table 1, 16 types of information 1 to 16 can be set based on the combination of the case where the phase difference is 45 ° (with phase difference) and the case where the phase difference is 0 ° (without phase difference). ..

Then, if the phase difference of 45 ° (with phase difference) is set to "1" and the phase difference of 0 ° (without phase difference) is set to "0", the result is as shown in Table 2. Due to the four phase differences θ1 to θ4, the code string becomes a 4-bit code string based on the combination of 1/4 bit and 0.

According to Table 2, regarding the "information No.", the information 1 corresponds to the code string of "0001", and the information 2 corresponds to the code string (information number data) of "0010". In this way, as shown in Table 2, the 4-bit code strings correspond to the information 16 up to the information 16. In this way, 16 types of "information numbers (information number data)" are created, and control information can be assigned to each of the 16 "information numbers (information number data)".

The method of adopting the above-mentioned code string will be described with reference to FIGS. 4A and 4B, and the method of changing the phase angle will also be described. 4A shows the phase angle change display patterns (1) to (8) of the code strings of the information 1 to 8, and FIG. 4B shows the phase angle change display patterns (9) to (16) of the code strings of the information 9 to 16. Shows. In each of the phase angle change display patterns (1) to (16), the horizontal axis indicates time, and the “○” at the five intersections shown from the left to the right in the bottom row represent the amplitude-modulated waves M0 to M4. It is shown conceptually. Further, in each of the phase angle change display patterns (1) to (16), the vertical axis indicates the shift of the phase difference (θ). In this example, the phase difference θ is set to 45 ° as described above. The phase difference θ is a carrier phase difference between two adjacent amplitude-modulated waves. Therefore, when the first amplitude-modulated wave M0 is used as a reference, it changes from + θ to + 4θ, and a phase difference of + 4θ at the maximum is generated. The symbols "1" and "0" between the respective "○" representing the amplitude-modulated waves M0 to M4 indicate "with phase difference (45 °)" and "without phase difference (0 °)". In the information 1 of the phase angle change display pattern (1), the code string "0000" is shown, and in the information 2, the code string "0001" is shown. After that, in the same manner, the phase angle change display patterns (3) to (16) from the information 3 (code sequence “0010”) to the information 16 (code sequence “1111”) are shown. With reference to the first amplitude-modulated wave M0, the phase difference between the subsequent amplitude-modulated waves M1 to M4 gradually increases.

As described above, the four phase differences generated by the five amplitude-modulated waves M0 to M4 by determining the amplitude-modulated wave M0 as a reference (head data) and selecting the sequence of the five amplitude-modulated waves M0 to M4. By setting a phase difference of 45 ° with respect to θ1 to θ4, 16 kinds of code strings (code strings of 1 and 0) can be created. By allocating control information to 16 different code strings, 16 types of control information (information 1 to 16) can be prepared, the amount of information can be increased, and multi-valued information can be achieved. Control information can be assigned to each of the information 1 to 16, for example, information of a train speed of 50 km / h, information of a train speed of 55 km / h, and the like. Train speed limit information can be set in more detail. In this way, it is possible to perform highly accurate train control based on a large amount of information as compared with the conventional technique.

The reference amplitude-modulated wave at the head is configured to be identifiable by adding, for example, a flag, and thereby to generate information required for control.

According to the above embodiment, a 4-bit code string is created by using each phase difference of five consecutive amplitude-modulated waves M0 to M4, control information is assigned, and the information amount is used for transmission of control information. Can be increased. The number of amplitude-modulated waves to be used is determined based on the time to be confirmed as information based on the allowable range from the control point of view. This time, 16 kinds of information can be created by a 4-bit code string, but if the setting time is increased, the amount of information can be further increased.

The phase angle detection unit 34, the phase angle determination unit 36, and the information identification unit 37 of the receiving side device 12 shown in FIG. 2 obtain each phase difference (carrier phase difference) from five consecutive amplitude-modulated waves M0 to M4 on the carrier wave C1. Take out, create a 4-bit code string, and take out the control information assigned to the code string.

In the description of the above embodiment, the unit phase angle that defines a constant phase difference θ has been described using the example of “45 °”, but the unit phase angle is not limited to this. As the unit phase angle that defines the phase difference θ, for example, “90 °”, “135 °”, and the like can be used in an increasing number of types. Further, as the phase difference θ, a plurality of unit phase angles may be used in combination to form a code string. This makes it possible to further increase the amount of information to be transmitted.

The configurations and the like described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented, and the numerical values and the elements of each configuration are merely examples. Therefore, the present invention is not limited to the described embodiment, and can be changed to various embodiments as long as it does not deviate from the scope of the technical idea shown in the claims.

The control system according to the present invention is used, for example, in an automatic train control device (ATC device), and is used for increasing the transmission of control information.

10 Control system 11 Transmitter device 12 Receiver device 12A DSP
12B CPU
13 Control target 21 Carrier wave generation unit 22 1st modulation unit 23 2nd modulation unit 24 Control information generation unit 25 Control information setting unit 31 Demodulation unit 32 Control information extraction unit 33 Modulation wave detection unit 34 Phase angle detection unit 35 Modulation wave identification unit 36 Phase angle discrimination unit 37 Information identification unit 38 Combination unit

Claims (8)

A carrier wave generator that generates a carrier wave and
A control information generator that generates a control information signal related to carrier phase setting and a control information signal related to modulated wave setting according to the set control information.
A first modulation unit that performs amplitude modulation processing on the carrier wave based on the control information signal related to carrier wave phase setting and sets the carrier wave phase for each amplitude modulation wave.
The modulation wave setting process is performed based on the control information signal related to the modulation wave setting for the arrangement of a plurality of the amplitude modulation waves in the time series in the carrier wave amplitude-modulated by the first modulation unit, and the adjacent amplitude modulation is performed. Using the phase difference of the carrier phase between waves, the carrier is modulated to include the control information based on a plurality of code sequences determined by the combination of the presence or absence of the phase difference of two or more carrier phases. The second modulator and
A control system characterized by being equipped with. It is a control system that allocates the control information by utilizing the phase difference of the carrier phase between the amplitude modulated waves created by using the carrier of one frequency, and transmits / receives the control information, and the second modulation unit is a control system. The control information is included based on each of the plurality of code strings determined by the combination of the phase difference of the carrier phase between the amplitude-modulated waves adjacent to each other in the sequence of at least three amplitude-modulated waves generated in the time series. The control system according to claim 1, wherein the carrier wave is modulated. The control system according to claim 1 or 2, wherein the phase difference of the carrier wave phase between the amplitude-modulated waves is determined with reference to a unit phase angle. The control system according to claim 3, wherein a plurality of the unit phase angles are prepared, and any one of them is used. The control system according to any one of claims 1 to 4, wherein the sequence of the amplitude-modulated waves is selected by determining the first reference amplitude-modulated wave. The control system according to any one of claims 1 to 5, wherein the sequence of the amplitude-modulated waves is formed by five amplitude-modulated waves, and the code string is a 4-bit code string. The control system according to any one of claims 1 to 6, wherein the control information is transmitted from a transmitting side device instructing control to a receiving side device including a controlled object. 7. The present invention is characterized in that the transmitting side device is a ground device, the receiving side device is an on-board device, and the control information is speed control information transmitted from the ground device to the on-board device. The control system described.

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