JP2007178226A - Time control device, method, and system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a time control device capable of acquiring a transmission time of accurate data by correcting a timepiece error or a transmission delay portion between a transmission device and a reception device, concerning a transmission/reception device of a communication network such as a network. <P>SOLUTION: The transmission device 1 transmits telegram information DT<SB>1</SB>by describing a standard time T<SB>1</SB>as a data generation time by a timepiece 2 on the transmission device 1 side in the telegram information DT<SB>1</SB>. The reception device 5 determines the difference between the described standard time T<SB>1</SB>and own device reception time T<SB>2</SB>. A fluctuation portion of a transmission delay is determined from the difference between the time difference and a value determined by averaging each time difference over a plurality of telegrams. The transmission time T<SB>0</SB>of data in a timepiece on the reception side is determined by subtracting the fluctuation time T<SB>U</SB>and an average delay T<SB>AT</SB>set beforehand from the reception time T<SB>2</SB>. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to time control between transmission / reception devices of a communication network (communication network), and more particularly to a time control device, a time control method, and time control for correcting fluctuations in standard time in time control between transmission / reception devices of a communication network. Regarding the method.

  Conventionally, in information transmission technology, communication networks have been used in various fields. When such a communication network is used, an error in the internal clock of the receiving terminal device between the transmission and reception devices and a timing shift due to transmission delay occur, but the required accuracy varies depending on the application used in the communication network. It is. For example, in the case of a personal computer used in an office, as a synchronization method for time, time information is transmitted from a master-side transmitting device to a plurality of receiving terminal devices, and each receiving terminal device has its own time information received. With the method of adjusting the time of the receiving terminal device, the delay error on the communication path can be synchronized in the second order. Also, in a communication network that transmits operation commands in the field of device control methods and sensing information, high-accuracy synchronization is required. For example, the timing of one device is managed, and the other device is synchronized with this timing. When synchronizing the clocks between devices with high accuracy, a method of transmitting an operation command together with the time to operate from one device or sensing information from multiple devices is affected by an accurate transmission delay. When collecting time information, there is a method of transmitting sensing information together with time information after accurately synchronizing the time of each device.

  Patent Document 1 discloses a time information synchronization method that highly accurately corrects an error of a built-in clock of a receiving terminal device between transmitting and receiving devices connected to the communication network described above. In this Patent Document 1, a frame is reciprocally communicated between a master device and a slave device multiple times, an average transmission delay time is measured, and time information and the measured average delay time are sent from the master device. The time is corrected in consideration of the average delay time. As a result, even in a communication network where the delay time of data transmission is not constant, it is possible to correct the error of the clock with high accuracy in consideration of the average transmission delay.

Also, in a communication network where the delay time is not constant, such as a packet communication system in which transmission / reception terminal devices communicate with each other, a clock is provided for each transmission terminal device and reception terminal device, and the transmission device is encoded in a packet The time at which the transmitting device receives the leading part of the information from the receiving terminal device is measured with its own clock and set in the packet header of the packet, and the receiving terminal device receives the first packet after call establishment And sets its own clock at a time that goes back a certain time in the past from the time set in the packet header of the packet, and the time set in the header for each received packet including the first received packet and the receiving terminal Delayed by buffering until the time of the device clock matches, encoded information in the packet from the time when both times match And to output start, fluctuation absorption processing method is disclosed in Patent Document 2.
Japanese Patent No. 2658962 Japanese Patent No. 2569493

  As for the accuracy of a general clock, the error of one day is about 1 second or less. Therefore, when the accuracy of the order of several hundred ms is required, the time is synchronized by the technique of Patent Document 1 about once per hour. For example, timing accuracy can be ensured. However, when higher accuracy of the order of several tens of ms is required, time synchronization with a considerable frequency is required, and synchronization communication hinders control communication. And have unrealistic challenges. Even in such a case, if the transmission delay is a substantially constant value, the operation timing is transmitted not at an absolute time but at a relative time (difference between the time when the operation should be performed and the current time), and corrected on the reception side in consideration of the delay time. If so, the accuracy can be secured to some extent. However, there is an inevitable problem in timing errors due to fluctuations in the transmission path.

  Further, according to the disclosed technique of Patent Document 2, a fluctuation absorption processing method that absorbs timing errors corresponding to fluctuations in transmission path delay is disclosed, but this method is based on packetization processing of a transmission system. Therefore, the fluctuation of the standard time due to the transmission delay in the transmission path is not corrected, and the fluctuation due to the delay in the communication network during the high-speed control causes many problems for the accurate time control of the standard time.

  The present invention has been made in view of the above-described problems. When advanced control is performed in a communication network such as a LAN (local area network), the transmission standard time has fluctuations due to transmission delay, but is connected to the network. It is an object of the present invention to provide a time control device, a time control method, and a time control method capable of avoiding fluctuations in standard time caused by transmission delay by synchronizing timing between communication devices in a communication network with high accuracy. .

  The time control device, the time control method, and the time control method according to the present invention are configured so that the receiving device that has received the information creation time on the transmitting device side when the information is transmitted is preset with the information creating time on the transmitting device side, the reception time of the information, and the like. It has a time control function for obtaining information creation time on the receiving device side based on the average transmission delay time.

  According to the time control device, the time control method, and the time control method of the present invention, it is possible to correct the transmission delay time for each information transmission, and the receiving device side accurately grasps the time each time information is transmitted. Therefore, high accuracy can be ensured when a control command for operating after a certain time is transmitted.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a system diagram of a time control device 15 comprising a transmission / reception device of the present invention. In FIG. 1, for example, a transmission device 1 on the ground station (ground) side is a mobile station (car, vehicle) as a communication partner. , The message information DT ₁ = D + T ₁ which is the sum of the data D and the creation time (hereinafter referred to as standard time) T ₁ of the clock data D in the transmission device ₁ is recorded in the reception device 5 in the portable terminal) The message information and time generator 2 transmits the message to the receiving device 5 via the communication network 4 including a wired transmission path or a wireless transmission path. The receiving device 5 receives the message information DT ₁ with a delay of the transmission delay time τ during transmission of the communication network 4. At this time, since the clocks of the transmission / reception devices 1 and 5 have errors, the standard time T ₁ described in the information transmitted from the transmission device 1 to the reception device 5 is transmitted by the clocks 2 and 8 on the reception device 5 side. A value different from the time is shown. In the present invention, the standard time information is corrected based on the standard time information transmitted from the transmission device 1, the reception time information, and the preset average transmission delay time, and the accurate transmission time in the clock 8 on the reception device 5 side is corrected. T ₀ is obtained.

The configuration in the receiving device 5 of FIG. 1 will be described in detail below. The standard time T ₁ of the telegram information DT ₁ supplied from the output terminal 3 of the transmission device 1 to the input terminal 6 of the reception device 5 via the communication network 4 is the first mixing unit 7 constituting the first subtractor. The data D is supplied to the first input terminal (−), and the data D is supplied to another system path for data processing. Second clock in the receiver 5 to the input terminal (+) of the first mixing section 7, i.e., the time information T ₂ is supplied at the time of receiving the standard time T ₁ of the from the time generator 8 of the apparatus Is done. The 1 T ₂ of the difference from the output terminal of the mixer 7 and time information T ₂ of the standard time T ₁ during reception of the time generator 8 of its own device and the standard time T ₁ of the in message information DT ₁ is of -T ₁ Is supplied to the input terminal of the averaging unit 9 and the first input terminal (+) of the second mixing unit 10 constituting the subtractor. It sought the average value _{T A} of the time difference obtained from the standard time _T 11 _{through T 1n} averaging unit plurality of the 9 message information _DT 11 _{to DT 1n} is, a second input terminal of the second mixing section 10 of (-) To be supplied.

The output time difference information T _A − (T ₂ −T ₁ ) of the second mixing unit 10 is supplied to the first input terminal (+) of the third mixing unit 12 constituting the adder. The average value _TA Τ of the delay time τ of the communication network 4 is supplied from the average delay time unit 11 to the second input terminal (+) of the third mixing unit 12, and T _{A Τ} + TA − (T ₂ −T ₁ ) is output from the third mixing unit 12, supplied to the second input terminal (−) of the fourth mixing unit 13 constituting the subtracter, and the time of the own apparatus is supplied to the first input terminal (+). The subtraction time T _s = _TA − + T _A − (T ₂ −T ₁ ) −T ₂ subtracted from the current time T ₂ on the reception device 5 side supplied from the generation unit 8 is the standard of the reception device 5 from the output terminal 14. Output from the output terminal 14 as the transmission time T ₀ .

  In FIG. 1 described above, the system diagram has been described with a hardware configuration, but the receiving device 5 can also be configured with software of a computer (hereinafter referred to as a CPU) 16 having a memory function as shown in FIG. The time correction method and time control method of the present invention will be described with reference to FIG. 2 corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 2, when the CPU 16 on the receiving device 5 side receives the message information DT ₁ from the time generating unit 2 in the message information on the transmitting device 1 side via the communication network 4, the computing unit 17 of the CPU 16 first starts the message information DT. a standard time T ₁ of the in _1, obtains the time difference T ₂ -T ₁ and time T _2, at which time generation unit of the apparatus (clockwise) 8 receives the data D from the first subtracting unit 7a. Then the average value _{T A} of the time difference obtained from the plurality of message information received _DT 11 _{to DT 1n} standard time _T 11 _{through T 1n} so far in the averaging unit 9. The difference _T U ₌ T A of average time _{T A} to a time difference _T 2 -T ₁ of message information DT ₁ received calculated by the averaging unit _{9 - (T 2 -T 1)} , i.e. the communication network 4 fluctuation T _U is obtained from the second subtracting unit 10a. Obtain time difference information _{(T 2 -T 1) - T} A + T AΤ the average delay time _{T Eitau} from the average time delay unit 11 which is preset to the value added by the first adder 12a. Then, by subtracting this time difference information from the time T _{2 of the} clock 8 by the third subtracting unit 13 a, the data transmission time T _S = _TA − + T _A − (T ₂ −T ₁₎ in the clock 8 of the receiving device 5. ) -T ₂ is output to the output terminal 14 of the CPU 16.

Here, the average delay time T _Eitau is the average value of the delay time in the network (a communication network) 4 to message information DT ₁ of the transmitter 1 side reaches the CPU16 side of the receiver 5. This is a value determined depending on the length and amount of message information DT ₁ for configuration of the network and transmission. Therefore, when the operation of the time control device 15 is started, the same communication as the actual communication is performed between the transmission / reception devices 1 and 5, and the average delay time TA is _obtained by actual measurement using a LAN analyzer (network transmission characteristic evaluation device) or the like. it can. Further, it may be obtained theoretically or by simulation at the design time. Alternatively, the telegram information DT ₁ may be sometimes reciprocated during operation of the transmission / reception devices 1 and 5 to measure the round-trip delay time, and half the value may be used as the transmission delay time _TA .

Hereinafter, it will be described with reference to FIG. 3 that the standard transmission time T ₀ can be corrected with the configuration of FIG. 3, the horizontal axis represents the time difference T ₂ -T ₁ and time T ₂ of the standard time T ₁ and the receiving device 5 side of the timepiece 8 in message information DT _1, the vertical axis represents the number of the plurality of message information frequency It is a histogram showing. Between the standard time T ₁ that is the creation time of the message information DT ₁ created in the transmission device 1 and the reception time T ₂ when the reception device 5 receives the message information DT ₁ , the following formula 1 Holds.

[Formula 1]
T ₂ = T ₁ + Δt + τ (1)
Here, T ₁ = message information creation time on the transmission device 1 side, that is, standard time, T ₂ = reception device side message information reception time, Δt = clock error, and τ = transmission delay time.

There is an error Δt between the clocks 2 and 8 built in the transmitter 1 side and the receiver 5 side, respectively. Therefore the time to receive the standard time T ₁ of the message information DT ₁ in the receiving device 5 side, the transmission delay time τ in addition to the standard time T ₁ which is the creation time message information DT ₁ of the transmitter 1 side, further watches The error Δt is corrected (added). Processing of the received data D is transmission delay time τ, time from the transmitter 1 side to create a message information DT ₁ until message information DT ₁ is transmitted, the receiving apparatus 5 is a message information DT ₁ and more precisely The processing time until the start of the transmission is included. Here, all of these are referred to as the transmission delay time τ. Such, the transmission delay time tau, different value for each message information DT _1, can be expressed as a sum of average delay T _A and fluctuation T _U by the following equation 2.

[Formula 2]
_{τ = T A + T u ···} (2)
In the above formulas 1 and 2, since the clock error Δt can be regarded as a constant value for a relatively short time, the reception time T ₂ of the telegram information DT ₁ on the reception device 5 side and the telegram creation on the transmission device 1 side time time difference T ₂ -T ₁ standard times T ₁ is will have an average value and distribution the sum of the average delay T _a and clock error Δt as shown in FIG. In this case deviations from the mean value in the individual message information DT ₁ is fluctuation T _u.

The time difference T ₂ -T ₁ between the reception time T ₂ of the telegram information DT ₁ on the receiving device 5 side and the standard time T ₁ when the telegram information is created on the transmission device 1 on the horizontal axis in FIG. the output of the second first subtraction portion 7a, which results were averaged in averaging section 9 over a plurality of message information DT ₁ is the clock error Δt _{= (T} 2 -T ₁₎ and the average delay _{T a} It is sum. The value _{T A} the time difference for a particular message information DT _{1 (T} 2 -T ₁₎ the difference between _{T A + (T 2 -T 1} ) is a fluctuation _{T U} of message information DT _1. If the average delay time T A _{加 え る} is added to this, the delay time of the message information DT ₁ is obtained. Therefore, it is possible to determine the transmission time T ₀ of the data D in the clock 8 of the receiving device 5 side by subtracting the transmission delay from the time T ₂ of the clock 8.

  Since the clock error Δt is obtained by taking the difference between the output of the averaging unit 9 and the average time delay unit 11, the clock 8 on the receiving device 5 side may be corrected based on this. Further, since the clock error changes when viewed over a long time, the averaging unit 9 may be set to a period in which the time error can be regarded as a constant value. As a result, the influence of the accumulation of the clock error Δt can be eliminated. Further, in the present invention, the time is corrected based on the information received by the communication network 4 of the network, but it does not depend on a specific transmission method, and the network includes a number of protocols including Ethernet. The present invention can be applied to any of them.

  FIG. 4 shows a configuration diagram when the time control device, the time control method, and the time control method of the present invention are applied to a railway vehicle network. In FIG. 4, intermediate vehicles 21 and 22 are connected to the leading vehicle 20, and the operation is controlled through a main network 4 a such as an inter-vehicle network (communication network 4). Central device 23 is installed in leading vehicle 20, and terminal devices 24 and 25 are installed in intermediate vehicles 21 and 22. Central device 23 and terminal devices 24 and 25 are connected through relay devices 26, 27 and 28, and inter-vehicle network 4 is connected. Main network 4a. Devices 29 and 30 are connected to the central device 23 of the leading vehicle 20, and devices 31 to 34 are connected to the terminal devices 24 and 25, and the vehicles 20, 21, and 22 constitute a branch line network 4 b. Here, the devices 29 to 34 are devices constituting a railway vehicle such as an inverter, a brake device, a door, an air conditioner, a control device for a driver's cab, or a display.

  Information transmission to the terminal devices 24 and 25 of the intermediate vehicles 21 and 22 and collection of state information of the intermediate vehicles 21 and 22 by command control from the control device of the cab of the leading vehicle 20 through the inter-vehicle network 4 as described above. And display on the cab display. The central device 24 of the leading vehicle 20 and the terminal devices 24 and 25 of the intermediate vehicles 21 and 22 relay data between the backbone network 4a and the branch line network 4b, and to each device 29-30 based on instructions from the control device of the cab. The detailed information is transmitted, the control command is created, and the state information from each of the devices 29 to 34 is processed and stored.

The top vehicle 20 and the intermediate vehicles 21 and 22 described above have the time control function described with reference to FIGS. 1 and 2, correct the standard time T ₁ of the message information DT ₁ , and transmit the top vehicle 20, for example. the standard time T ₁ is a creation time of the data D for transmission from the cab of the control device constituting the apparatus 1 via the backbone network 4a and branch network 4b, constituting the receiver 5 of the intermediate vehicle 21 side it is possible to accurately grasp the standard time T ₁ in cab controller for. Therefore, if a command for operating the devices 29 to 34 is transmitted from the central device 23 after a lapse of a predetermined time, the device information 31 to 34 on the terminal devices 24 and 25 side of the intermediate vehicles 21 and 22 is the creation time of the message information DT _1. it is possible to start the operation after the lapse of the specified time from the standard time T _1. As a result, the terminal devices 24 and 25 of the vehicles 21 and 22 can be operated at exactly the same timing in accordance with a command from the central device 23, or the devices 31, 32, 33, and 34 can be operated in order with an accurate time difference. It is. Further, when collecting various state information from each of the devices 29 to 34, it is possible to grasp the time relationship of information more accurately by managing not the reception time of the data D but the creation time.

  One embodiment in the case where the above-described vehicle-to-vehicle network 4 is used to eliminate the time lag between the connected vehicles and to perform the vehicle body tilt control without feeling uncomfortable will be described with reference to FIG. Conventionally, in a vehicle body tilt control system using a dedicated control communication line, in response to a command from the leading vehicle 20 every several hundred milliseconds, the intermediate vehicles 21 and 22 sequentially tilt the vehicle body at a curve point on the track. Although the control is performed, in the information transmission by the communication network such as the network between the vehicles, the timing of the vehicle inclination deviates from the optimum value due to the transmission delay, the control period between the transmission and reception devices, the delay fluctuation of the communication network, etc. There is a problem that the ride comfort of the vehicle is lowered due to a timing error at the time of tilt control. In order to solve this problem, in this example, the time between the vehicles is corrected by adopting the following configuration, and the tilt control between the vehicles can be performed with more accurate timing.

In FIG. 4, the central device 23 of the leading vehicle 20 is connected to the main network 4a and the intermediate vehicle 21 connected to the branch network 4b to the terminal devices 24, 25 of the intermediate vehicles 21, 22 via the relay devices 26, 27, 28. sequentially intermediate vehicle 21 and 22 indicates the time information tilt control come to a predetermined curve position of the line as the message information DT ₁ to the inclined device is a device 31, 32, 33, 34 in 22, in advance, the vehicle The average delay time of the inter-network 4 is measured or logically obtained, and the fluctuation is corrected by the following procedure.

First, the terminal devices 24 and 25 in the intermediate vehicles 21 and 22 store the telegraphic information DT _{1 in} which the time information T ₁ for tilt control from the central device 23 of the leading vehicle 20 is recorded. Then, the terminal device 24, 25 is constantly calculates the time difference between the clocks in the time information _{T 1} and the terminal device 24, 25 in the message information DT _1, an average value. Furthermore, by subtracting the average value from the time difference between the clock time information T ₁ and the terminal device 24 and 25 of the message information DT _1, obtains a fluctuation T _u of message information DT _1, further also subtracts the average delay from the mean value Then, the inclination control of the intermediate vehicles 21 and 22 is performed based on the transmission time T ₀ in which the clock deviation in the terminal devices 24 and 25 is corrected.

In addition, the present invention can be applied to the time control device, the time control method, and the time control method even when the vibration of the vehicle is suppressed using the inter-vehicle network 4 between the connected vehicles. That is, the vibration information D of one adjacent vehicle between the leading vehicle 20 and the intermediate vehicle 21 or between the intermediate vehicle 21 and the intermediate vehicle 22 is transmitted to the other vehicle, and the coupling spring between the adjacent vehicles is loosened. For example, when the generated vibration of about 1 Hz that swings back and forth between adjacent vehicles is controlled by forward / reverse rotation control of the drive motor of each adjacent vehicle, it is detected by, for example, a vibration detection device composed of the device 29 of the leading vehicle 20. The message information DT ₁ including time information T ₁ for correcting the vibration information D and the delay time τ and fluctuation T _u generated in the inter-vehicle network 4 is transmitted, and the terminal device 24 transmits the time information T in the message information DT _{1. 1} is always calculated and the average value is obtained. Furthermore, by subtracting the average value from the time difference between the clock time information T ₁ and the terminal device 24 and 25 of the message information DT _1, obtains a fluctuation T _u of message information DT _1, further also subtracts the average delay from the mean value Then, by controlling the drive motor of the intermediate vehicle 21 based on the transmission time T _{0 in} which the time difference in the terminal devices 24 and 25 is corrected, vibration can be suppressed.

FIG. 5 is a system diagram for explaining the operation of the time control device according to the third embodiment of the present invention. In FIG. 5, parts corresponding to those in FIG. 1 are assigned the same reference numerals and redundant description is omitted. Although not specifically defined in the first embodiment, the transmitting apparatus 1 uses the telegram information D _{1 in} this embodiment. Are sent periodically. Further, it is not necessary to record the data creation time T ₁ as described in FIGS. 1 and 2 in the message information D ₁ , and the receiving device 5 is configured to correct the time information based on the period information of the message information. ing.

In FIG. 5, the output of the periodic timer 35 is used instead of the message information and the time generator 2 of FIG. 1. The period timer 35 is configured to output time information increased by the transmission period every time the telegram information is received. For example, the initial value is arbitrary, and when the telegram information is received for the first time, the time at that time is set. Output. As a result, the cycle timer 35 outputs a value having a certain time difference from the transmission time of each message information D _{1 to} D _n . Each time the telegram information D _{1 to} D _n is received, the mixer 7 constituting the first subtracter obtains the time difference between the time generator 8 of the own device on the receiving device 5 side and the period timer 35. After that, the procedure for obtaining the transmission time T ₀ on the receiving device 5 side using the averaging unit 9 and the average delay time delay unit 11 is the same as that in the first embodiment, and thus detailed description thereof is omitted.

Figure 6 (A) through FIG. 6 (C) shows a time chart of the message information _{D 1} in FIG. 6A shows the transmission time 36 of the transmission apparatus 1, FIG. 6B shows the reception time 37 of the reception apparatus 5, and FIG. 6C shows the output time 38 of the periodic timer. All times are values in the time generation unit 8 of the own device on the receiving device 5 side. Transmission time of the message information D ₁ 36 is unable to detect directly at the receiving device 5 side, a constant interval of period T. The reception time 37 is a value obtained by adding the transmission delay time 39 to the transmission time 36, and the interval is not constant due to the delay time fluctuation 40. The output of the cycle timer 35 is a reference time of the transmission cycle T interval. The difference Δt1 to Δt4 between the reception time 37 and the output of the period timer 35 is obtained by subtracting the time of the time generator 8 of the own apparatus and the output time 38 of the period timer 35 in FIG. It corresponds to the difference time.

  FIG. 7 is a histogram showing the difference between the reception time 37 and the period timer 35 output time 38. The fact that time correction is possible with the configuration of FIG. 5 will be described with reference to FIG. The relationship of Equation 3 is established between the reception times and the periodic timer output time 38.

[Formula 3]
[Reception time 37 = period timer output time 38 + time difference between transmission time 36 and period timer 35 Δt 1 to Δt 4 + transmission delay time T _AΤ ] (3)
The transmission delay time T _Eitau is different value for each message information D _1, as a sum of average delay T _A and fluctuation T _U expressed by Equation 4 below.

[Formula 4]
[Transmission delay time T _AT = average delay T _A + fluctuation T _U ] (4)

Since the time difference Δt1 to Δt4 between the transmission time 36 and the cycle timer 35 can be regarded as a constant value for a relatively short time, the difference between the reception time 37 and the output time 38 of the cycle timer 35 is as shown in FIG. It will have an average value and distribution of the sum of (a negative value in the example of FIG. 7) and the average delay T _a time difference of transmission time 36 and the cycle timer 35. In this case deviations from the mean value in the individual message information D ₁ is fluctuation T _U.

Time difference Δt of the reception time 37 and cycle timer 35 in the message information D ₁ of the horizontal axis of FIG. 7, the output of the subtraction processing of the first mixer 7 of Figure 5, a plurality of message information D ₁ of the this value the difference between the output obtained by averaging, the time difference between the message information D ₁ received by the averaging unit 9, the fluctuation T _U of message information D _1. If the average delay T A _設定 set in advance by the average time delay unit 11 is added to this, the transmission delay time of the message information D ₁ is obtained. Therefore, the transmission time 36 (T ₀ ) of the data D is obtained by subtracting the transmission delay time from the fourth mixer 13 from the time generator 8 of the own apparatus.

If averaging is continued over a long period of time, the shift in the period due to the clock error accumulates and becomes an error. Therefore, the average may be set to such an extent that the clock error does not become a problem. Further, when the telegram information cannot be normally received due to a transmission error or the like, there is a possibility that the correspondence between the reception time 37 and the output of the period timer 35 may be strange. With the serial number in the message information D ₁ in order to prevent this, etc. to be one skip output cycle timer 35 when received in skipping one message information D, the period timer 35 in response to the serial number You can also adjust the output.

As in the first embodiment, this example does not depend on a specific transmission method, and can be applied to networks such as Ethernet. As described above, also in the present embodiment, it is possible to accurately know the transmission time of the data D on the receiving device 5 side as in the first embodiment. In this example, although not obtained the time error between the transmitting and receiving devices 1 and 5, when the period transmitted a control transmission is necessary, the time information T ₁ is processed to simplify the required transmitting apparatus 1 side Is done.

  According to the time control device, the time control method, and the time control method of the present invention, in the time control device (method and method) capable of exchanging information by transmitting and receiving message information, the message information on the transmission device side when the message information is transmitted. A time description function that describes the creation time, a message information creation time on the transmission device side described in the message information when the message information is received, a message information reception time, and a preset average transmission delay time. In addition, since it has a time control function to obtain the telegram information creation time on the receiving device side, it is possible to correct the transmission delay time for each information transmission and accurately receive the time each time information is transmitted Since it can be grasped on the apparatus side, high accuracy can be ensured when a control command for operating after a certain time is transmitted.

  In addition, when collecting various sensing information from multiple transmitters, the sensing information can be grasped together with accurate time information, and the fluctuation of the standard time transmitted from the transmitter can be measured from the reception time to the average transmission delay. By subtracting the time and obtaining the time on the receiving apparatus side, more accurate timing control is possible.

  Furthermore, the time control function includes a time difference calculation function for obtaining a transmission / reception time difference from the difference between the reception time of the message information and the message information creation time on the transmission device side, and the transmission / reception time difference between the transmission / reception time difference and the transmission / reception time difference of the message information received in the past. Because it has a fluctuation calculation function that calculates fluctuation from the difference in average value and a message creation time calculation function that subtracts the average transmission delay time and fluctuation from the reception time of the message information, and calculates the message creation time on the receiving device side, By removing the influence of the fluctuation of the standard time transmitted from the transmission device, more accurate timing control is possible.

  According to the time control device, the time control method, and the time control method of the present invention, in the time control device (method and method) capable of exchanging information by transmitting and receiving message information, a periodic transmission function for periodically transmitting message information; Since it has a time control function to obtain the message information creation time based on the reception time of the message information at the time of reception of the message information, the cycle time of the message information, and the preset average transmission delay time, The transmitting device only transmits the message information periodically, and it is not necessary to record the data creation time in the message information, and the time information can be corrected based on the period information of the message information.

  In addition, the time control function includes a time difference calculation function for obtaining a reception time difference from a difference between a reception time of the message information and a reference time that is increased by a period time every reception of the message information, and a reception time difference and the message information received in the past. A fluctuation calculation function for obtaining fluctuations based on the difference in the average value of the reception time differences, and a message creation time calculation function for subtracting the average transmission delay time and fluctuations from the reception time of the message information to obtain the message information creation time. Therefore, more accurate timing control can be performed by removing the influence of the fluctuation of the standard time transmitted from the transmission apparatus.

It is a block diagram which shows one example of a time control apparatus of this invention. It is a system diagram for operation | movement explanation which shows one example of the time control apparatus of this invention. It is a histogram for operation | movement description of the time control apparatus of this invention. It is a block diagram which shows one form example which applied the time control apparatus of this invention to the train time control apparatus. It is a system diagram for operation | movement description which shows the other example of a time control apparatus of this invention. It is a timing diagram for operation | movement explanation which shows the other example of a time control apparatus of this invention. It is a histogram for operation | movement explanation which shows the other example of a time control apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transmission apparatus, 2 ... Message information and time generation part, 4 ... Communication network, 5 ... Reception apparatus, 7 ... 1st mixer, 8 ... Time of own apparatus Generation unit, 9 ... averaging unit, 10 ... second mixer, 11 ... average time delay unit, 12 ... third mixer, 13 ... fourth mixer, DESCRIPTION OF SYMBOLS 15 ... Time control apparatus, 16 ... Computer, ..., 20 ... Lead vehicle, 21, 22 ... Intermediate vehicle, 23 ... Central device, 24, 25 ... Terminal device, 26, 27, 28 ... relay device, 29-34 ... equipment, 35 ... periodic timer

Claims (11)

In a time control device capable of exchanging information with each other by sending and receiving telegram information,
A time description function for recording the message information creation time on the transmission device side when transmitting the message information;
Message information creation time on the transmission device side described in the message information at the time of reception of the message information;
The time when the above message information is received,
Pre-set average transmission delay time,
And a time control function for obtaining a message information creation time on the receiving device side. The time control function is a time difference calculation function for obtaining a transmission / reception time difference from a difference between a reception time of the message information and a message information creation time on the transmission device side;
Fluctuation calculation function for obtaining fluctuation from the difference between the transmission / reception time difference and the average value of the transmission / reception time difference of the message information received in the past,
2. The time control device according to claim 1, further comprising a telegram creation time calculation function for subtracting the average transmission delay time and the fluctuation from the reception time of the telegram information to obtain a telegram creation time on the receiving device side.   3. The time control apparatus according to claim 1, further comprising a time correction function for correcting the built-in clock based on a calculation result of the time control function. In the time control device that distributes the transmission device for transmitting the telegram information to the leading vehicle, distributes the reception device to the intermediate vehicle, controls the device via the communication network, and controls the vehicle inclination,
The time control device according to any one of claims 1 to 3, wherein the time information generation time is obtained by the time control function on the receiving device side, and the intermediate vehicle is tilted at a predetermined curve position. . In a time control device capable of exchanging information with each other by transmitting / receiving device of message information,
A periodic transmission function for periodically transmitting message information;
When receiving the message information,
The cycle time of message information,
Pre-set average transmission delay time,
A time control device having a time control function for obtaining a message creation time based on the above. The time control function is a time difference calculation function for obtaining a reception time difference from a difference between a reception time of the message information and a reference time that is increased by the period time for each reception of the message information;
Fluctuation calculation function for obtaining fluctuations by the difference between the reception time difference and the average value of the reception time difference of the message information received in the past,
A message creation time calculation function for subtracting the average transmission delay time and the fluctuation from the reception time of the message information to obtain a message creation time;
6. The time control apparatus according to claim 5, further comprising: In the time control device that distributes the transmission device for transmitting the telegram information to the leading vehicle, distributes the reception device to the intermediate vehicle, controls the device via the communication network, and controls the vehicle inclination,
The time control device according to claim 5 or 6, wherein the time information function is used to determine the time at which the telegram information is created, and the intermediate vehicle is tilted at a predetermined curve position. In the time control method,
It has a time description procedure that describes the message creation time on the transmitting device side when transmitting the message information,
A procedure for obtaining a transmission / reception time difference from the difference between the reception time of the message information and the message information creation time on the transmission device side when receiving the message information;
A procedure for obtaining fluctuations from the difference between the transmission / reception time difference and the average value of the transmission / reception time difference of messages received in the past,
A procedure for subtracting the average transmission delay time and the fluctuation from the reception time of the message to obtain a message information creation time on the receiving device side;
A time control method characterized by comprising: In the time control method,
A procedure for periodically sending message information during transmission;
A procedure for obtaining a reception time difference from a difference between a reception time of the message information and a reference time that is increased by a transmission cycle time every reception of the message information;
A procedure for obtaining fluctuations based on the difference between the reception time difference and the average value of the reception time difference of the message information received in the past,
A procedure for subtracting the average transmission delay time and the fluctuation from the reception time of the message information to obtain a message information creation time;
A time control method characterized by comprising: In the time control method between transmitting and receiving devices,
It has a time description procedure that describes the message creation time on the transmitting device side when transmitting the message information,
A procedure for obtaining a transmission / reception time difference from the difference between the reception time of the message information and the message information creation time on the transmission device side when receiving the message information;
A procedure for obtaining fluctuations from the difference between the transmission / reception time difference and the average value of the transmission / reception time difference of messages received in the past,
A procedure for subtracting the average transmission delay time and the fluctuation from the reception time of the message to obtain a message information creation time on the receiving device side;
A time control method characterized by comprising: In the time control method between transmitting and receiving devices,
A procedure for periodically sending message information during transmission;
A procedure for obtaining a reception time difference from a difference between a reception time of the message information and a reference time that is increased by a transmission cycle time every reception of the message information;
A procedure for obtaining fluctuations based on the difference between the reception time difference and the average value of the reception time difference of the message information received in the past,
A procedure for subtracting the average transmission delay time and the fluctuation from the reception time of the message information to obtain a message information creation time;
A time control method characterized by comprising:

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