JPH10260721A - Data recording and reading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly discriminate the timewise preceding/following relation of events stored in various storage media. SOLUTION: When a car accident occurs, monitor data are generated as data related to the event with the car accident in a storage device 2 on the side of vehicle, and these monitor data are stored on an IC card 3 together with time data. On the other hand, monitor data are generated as data related to the event with the car accident by a ground controller 6 on the side of ground, and these monitor data are stored in a storage device 9 together with time data from a clock 8. After the accident occurs, the IC card 3 is connected to a card reader 7, the current time of clock built in the IC card 3 and the current time of clock 8 on the ground side are simultaneously read out, the time difference between the both is found and with this time difference as a reference, the ground side monitor data and the on-vehicle side monitor data are rearranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording and reading system, and more particularly to data suitable for recording time data and data relating to an event in association with each other and reading out data relating to the time data and an event when necessary. The present invention relates to a recording and reading system.

[0002]

2. Description of the Related Art Conventionally, an automatic train control system has been known as a data recording and reading system. This automatic train control system communicates between the on-board control device mounted on the train and the ground control device located on the ground via the on-vehicle power receiver, rail and ground-based transmitter while controlling the train. Control is performed. In this system, in order to record an event that occurs with the operation of the train together with the time, the data on the event together with the time data of a clock mounted on the vehicle at the time of the event occurrence is recorded on the upper side of the vehicle.
Recording is performed on a card, and on the ground side, data relating to an event generated by the ground control device is stored in a storage device in association with time data of a clock. The clocks on the vehicle side and on the ground side are each calibrated once a day at the start of business.

[0003] Here, the error of each clock is calculated for one day (24 hours).
Assuming Δtd (sec), the error Δth (sec) per hour is as shown in the following equation (1).

Δth = Δtd / 24 (sec) (1) In equation (1), if Δtd = 100 (msec), then Δth = 4.2 (msec).

[0005]

In such an automatic train control system, when an accident such as a vehicle failure occurs 12 hours after the start of work, an IC card on the vehicle is regarded as an event associated with the vehicle failure. Events T1 through N occur at time
1 ′ to Tn ′, and ground occurrence events 1 to M are recorded in the storage device on the ground side in association with times T1 to Tm. And to find out the cause of the vehicle failure,
The data stored in the IC card and the storage device are searched, but since the accident occurred 12 hours after the start of operation, the error between the clock on the ground side and the clock on the upper side of the vehicle was 4.2 (msec) based on the above assumption. ) × 12 = 50.4 (ms) (2) At this time, when comparing the time between the event on the vehicle and the event on the ground, if the time difference between the time data of the two events is more than twice (100.8 ms) the value of the equation (2), The temporal order relation in which both events occurred becomes clear only by comparing each data. However, when the time difference between the time data is equal to or less than the value of the expression (2), it is difficult to specify the temporal order relationship in which both events occur only by comparing the stored data. In this example,
Although the clock is calibrated once a day at the start of business, it is clear that the cumulative error of the time data increases when the calibration cycle is increased.

On the other hand, a standard clock is arranged in such an automatic train control system, and the trains are controlled while always calibrating the clocks of the on-board control device and the ground control device in accordance with the standard clock. To the extent that the time difference on the ground side does not matter, it may be possible to speed up the communication between the ground and the vehicle and transfer the data on the vehicle to the ground in real time. The scale is large, the cost of the system increases, and it is difficult to realize.

An object of the present invention is to provide a data recording / reading system capable of accurately determining the temporal context of events stored in different storage media.

[0008]

In order to achieve the above object, the present invention provides a plurality of clocks for generating time signals and a plurality of clocks provided in association with each clock and storing time data and data relating to events. A plurality of recording means for generating data related to an event when an event occurs, and correlating the data related to the event with time data according to a time signal of a specified clock in a specified storage medium; The time data and the data relating to the event are read from the medium, the current time of each clock is simultaneously read from the time signal of each clock, and the relative time axis common to each clock is set based on the difference between the current times of the clocks. Data reading means for correcting each time data according to the above, and outputting the corrected time data in association with data relating to each event. It is obtained by constituting the readout system.

In configuring the data recording and reading system, instead of providing a storage medium in association with each clock, a time signal is built in as each storage medium and time data based on the time signal of the built-in clock is stored. In addition, it may be configured to store data relating to an event. Further, as a data reading means, a reference clock for generating a time signal is built in to read time data and data relating to an event from each storage medium, and simultaneously read the current time of each clock from the time signal of each clock, Each time data may be corrected according to the difference between the current time and the current time of a built-in reference clock, and the corrected time data may be output in association with data relating to each event.

In configuring each of the data recording and reading systems, at least one of the plurality of storage media may be configured as a portable type or may be configured as an IC card.

According to the above-mentioned means, after the occurrence of the event, the time data and the data relating to the event are read out from each storage medium and the current time of each clock is simultaneously read out, and the common relative time of each clock is determined from the difference between the current time of each clock. Set the time axis,
Each time data is corrected according to the set relative time axis, and the corrected time data is output in association with the data related to each event, so that the temporal order of events recorded on different storage media Can be accurately determined, and the time course of events stored in a plurality of storage media can be clarified, for example, when a system failure occurs.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of an automatic train control system according to an embodiment of the present invention. In FIG. 1, an on-board control device 1, a recording device (monitor device) 2, I
A C card 3 and a power receiver 4 are arranged, and a transmitter 5, a ground control device 6, a card reader 7, a clock 8, and a storage device 9 are arranged on the ground side. The on-board control device 1 transmits data related to train operation from the ground control device 6 to the transmitter 5.
When transmitted over the various data,
0, receive via the power receiver 4, and control the operation of the train based on the received data. The recording device 2 generates monitor data as data on train operation and data on events, records the monitor data, and
It is configured to transfer to the card 3.

The IC card 3 is a storage medium having a built-in clock, as shown in FIG.
1, a memory 12 as data storage means, a clock 13 as timekeeping means, a battery 14 for supplying power to the memory 12 and the clock 13, and an interface 15 for transmitting and receiving data to and from the recording device 2. ,
The memory 12, the clock 13, and the interface 15 are connected to each other via a bus (data, address, control signal). When the monitor data is transferred from the recording device 2, the CPU 11 stores each monitor data in a designated area in association with time data according to a time signal generated from the clock 13. That is,
The CPU 11 is configured as a recording unit together with the recording device 2.

On the other hand, the ground control device 6 generates data relating to the operation of the train, generates monitor data as data relating to the event when the event occurs, and outputs the monitor data according to the time signal generated from the clock 8. The storage means is configured to store the information in a designated area of the storage device (storage medium) 9 in association with. Further, the monitor data and the time data stored in the recording device 9 are transferred to the card reader 7 according to a command from the ground control device 6.

The card reader 7, as shown in FIG.
It comprises a C card interface 16, a ground interface 17, a CPU 18 as arithmetic means, and a memory 19 as data storage means, and each part is connected to each other via a bus. The IC card 3 is connected to the interface 16, and data stored in the memory 12 of the IC card 3 is input. The interface 17 has a storage device 9 on the ground side.
And the time data from the clock 8 are input. The CPU 18 reads the time data and monitor data input to the interfaces 16 and 17 and also inputs the time data from the clocks 13 and 8 to simultaneously read the current times of the clocks 8 and 13. A relative time axis common to each clock is set based on the difference in the current time, each time data is corrected according to the set relative time axis, the corrected time data is output in association with each monitor data, and the memory 19 is output.
As data reading means for storing data in the designated area.

Next, the operation of the system shown in FIG. 1 will be described.

When the operation of the train is controlled while communicating with each other between the on-board control device 1 and the ground control device 6, the monitor data is recorded in the on-vehicle recording device 2 and the ground control device 6 respectively. The generated monitor data is stored in the IC card 3 and the storage device 9, respectively. In this case, in the IC card 3, the monitor data is read via the interface 15, time data immediately after the monitor data is read is read from the clock 13, and the read monitor data and the time data correspond to one event. The data is written to the memory 12 as data. on the other hand,
On the ground side, when writing monitor data,
Is read, and the read time data and the monitor data generated by the ground control device 6 are stored in the storage device 9 as one event data. In addition,
The calibration of the clock 13 of the IC card 3 and the clock 8 on the ground is not performed every day, but is performed at an arbitrary date and time.

Next, for example, when an accident such as a vehicle failure occurs 12 hours after the commencement of operation, the on-board controller 1 generates monitor data relating to a plurality of events 1 to N related to the vehicle accident. Is time T1 'to T
n ′ is stored in the IC card 3. Similarly,
On the ground side, the ground control device 6 generates monitor data related to a plurality of events 1 to M related to the vehicle accident, and the monitor data is stored in the storage device 9 in association with times T1 to Tm.
Is stored. Then, the IC card 3 is removed and the card reader 7 is connected to the card reader 7 within a short time after the occurrence of the accident.

After the IC card 3 is connected to the card reader 7, the card reader 7
7, the time data indicating the current time of the clock 13 of the IC card 3 and the time data indicating the current time of the clock 8 are read out simultaneously or with a time difference of μs, and each time data is stored in the memory 19. Thereafter, the time difference between the time data is calculated by the operation of the CPU 18. Assuming that this time difference is Δt, it can be expressed as the following equation (3).

Δt = | T−T ′ | (3) where T is the current time of the clock 8 on the ground, and T ′ is the current time of the clock 13 built in the IC card 3.

Next, the card reader 7 reads out event data (monitor data + time data) stored in the memory 12 of the IC card 3 and the storage device 9 on the ground side via the interfaces 16 and 17 and stores the data in the memory. 19 is stored. Thereafter, a process related to the correction of the time data is performed by the operation of the CPU 18. In this case, the time data of both events is corrected to one time axis from the relationship of equation (3). For example, a relative time axis common to the clocks is set from the difference between the current times of the clocks 8 and 13, and each time data is corrected according to the set relative time axis. As this correction, for example, a process of adding a correction value to one time data or subtracting a correction value from the other time data is performed. Thereafter, as shown in FIG. 4, the ground occurrence events and the on-vehicle occurrence events are sequentially rearranged in the order of the corrected time data, and data relating to the rearranged events are stored in the memory 19.

At this time, the two watches 8, 1
3 is 1 hour, the error of each of the clocks 8 and 13 is calculated as Δt as in the conventional example.
Assuming that d = 100 (msec), the maximum value of the error when the time data obtained from each of the clocks 8 and 13 is corrected to one time data by the equation (1) is (Δtd / 24) × 1 × 2 = 8.2 (msec) (4)

That is, by reading the current times of the two clocks 8 and 13 at the same time before a long time elapses after the occurrence of the accident, the time data of the two types of events is corrected based on one time data. Therefore, it is possible to clarify the temporal sequence relationship between the on-vehicle event and the ground-occurring event with ten times or more accuracy as compared with the conventional example.

Further, in the present embodiment, when correcting the time data, the clocks 8 and 1 are not used without using the standard time.
Since the relative time axis is set based on the difference between the current times of the clocks 3, calibration of the clocks 8 and 13 is not necessarily required. For example, even if each clock 8 or 13 has an error of one day or more, It is possible to clarify the temporal context of events stored in different storage media.

Next, another embodiment of the card reader 7 will be described with reference to FIG.

The card reader 7 in the present embodiment is a card reader with a built-in clock, and
0, CPU 31 as arithmetic means, memory 32 as data storage means, clock 33 as time keeping means, memory 3
2 and a battery 34 for supplying power to the timepiece 33. The interface 30 is configured to read data from the IC card 3. CPU31
Receives time data and monitor data from the interface 30, inputs time data relating to the current time from the clock 33 using the clock 33 as a reference clock, and outputs the current time input from the interface 30 and the current time input from the clock 33. The time data is corrected according to the difference between the two, and the corrected time data is stored in the memory 32 in association with the monitor data and output as data reading means.

Here, when the IC card 3 is connected to the interface 3 as an IC card having a built-in clock, the CPU 31 reads out the current time of the clock 33 and simultaneously reads the current time of the clock 13 built in the IC card 3. Is read, and the read current time is stored in the memory 32. Thereafter, the CPU 31 calculates a difference between the time data stored in the memory 32 and stores the calculation result. Next, event data (monitor data + time data) stored in the IC card 3 is read out via the interface 30 and stored in the memory 32. Then, the time data read as the event data is corrected based on the time data of the clock 33. After the above processing is completed, a new IC card is connected to the interface 30, and the time of the new IC card is corrected in the same procedure. In this case, the new IC card may store data relating to an event on the ground side or may store data relating to an event of another vehicle.

According to this embodiment, the time data of the plurality of IC cards is corrected based on the time of the clock 33 of the card reader 7, so that the event data of the plurality of IC cards is aligned with one time axis. Can be sorted.

The present invention is not limited to the above embodiments. For example, each IC card corresponding to an infinite number of storage devices is provided with an individual clock, and each recording device A,
Even if B, C,... Individually record data on events, if the time of each IC card is read by the card reader and the time of each IC card is corrected according to the time read by the card reader, each recording device Clarifies the temporal sequence of all the events recorded.

[0031]

As described above, according to the present invention,
Since time data stored in different storage media is corrected according to one time axis, the temporal context of events stored in different storage units can be accurately determined, and the time of a plurality of events can be determined. It is possible to clarify the historical background.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an automatic train control system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an IC card.

FIG. 3 is a block diagram showing a configuration of a card reader.

FIG. 4 is a diagram showing an output example of monitor data.

FIG. 5 is a block diagram showing another embodiment of the card reader.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 On-board control device 2 Recording device 3 IC card 4 Power receiver 5 Transmitter 6 Ground control device 7 Card reader 8 Clock 9 Storage device

Claims (5)

[Claims] 1. A plurality of clocks for generating a time signal, a plurality of storage media provided in association with each clock for storing time data and data relating to an event, and generating data relating to an event when the event occurs. Recording means for associating data with each other and time data according to a specified clock time signal on a specified storage medium, reading time data and event-related data from each storage medium, The current time of each clock is read out simultaneously from each other, the relative time axis common to each clock is set from the difference between the current time of each clock, each time data is corrected according to the set relative time axis, and the corrected time data is transferred to each event. And a data reading means for outputting the data in association with data relating to the data recording. 2. A plurality of storage media having a built-in clock for generating a time signal, storing time data based on the time signal of the built-in clock, and storing data relating to an event, and generating data relating to the event when the event occurs and relating to the event. A plurality of recording means for associating data with time data according to a designated clock time signal and recording the data in a designated storage medium; reading time data and data relating to an event from each storage medium; Simultaneously read the current time of each clock, set the relative time axis common to each clock from the difference between the current time of each clock, correct each time data according to the set relative time axis, and apply the corrected time data to each event. A data recording and reading system comprising: a data reading unit that outputs the data in association with data. 3. A plurality of storage media having a built-in clock for generating a time signal, storing time data based on the time signal of the built-in clock, and storing data relating to an event, and generating data relating to the event when the event occurs and relating to the event. A plurality of recording means for associating data with time data according to a time signal of a designated clock and recording the data in a designated storage medium; and a built-in reference clock for generating a time signal; And read the current time of each clock from the time signal of each clock,
Data recording means for correcting each time data according to the difference between the current time of each clock and the current time of a built-in reference clock, and outputting the corrected time data in association with data relating to each event; Readout system. 4. At least one of the plurality of storage media
4. The data recording and reading system according to claim 2, wherein one of the two is configured as a portable type. 5. At least one of said plurality of storage media
4. The data recording and reading system according to claim 2, wherein each of the data recording and reading systems comprises an IC card.