JP2007256210A - Correction device for sensor data detection time - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a correction device for a sensor data detection time, capable of accurately correcting the sensor data detection time of sensor value. <P>SOLUTION: This correction device accurately calculates correction amount for the sensor data detection time, by dividing the correction amount for the sensor data detection time with the time elapsed until the sensor data detection time, by using the time corrected the last time as a reference. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sensor data detection time correction apparatus that corrects the detection time of sensor data.

  In order to analyze abnormalities and daily phenomena in the monitoring target, the target sensor data is analyzed. At this time, if the detection time is given to the sensor data, it is possible to perform analysis with time by combining the plurality of sensor data by referring to the detection time.

  In general, since the system time is used as the detection time, each system acquires a standard time from an NTP (Network Time Protocol) server, corrects the individual system time, and then sets the detection time in the sensor data. (See Non-Patent Document 1).

"Attention level estimation system for viewing video by image sensing", Katakuma, Yamamoto, Kuchiuchi, Nakayama, Shimokura, Information Processing Society of Japan Research Report, p.p. 267-272

"Precise measurement and evaluation of time accuracy on PC", Kitaguchi, Machizawa, Nakagawa, Nishimura, Nisako, Hakozaki, IEICE Technical Report, VOL.103, NO.444 (CQ2003 63-85)

However, the crystal oscillator that controls the computer time is affected by a temperature change, and there is a problem that even if the system time is corrected once by the NTP server, the time is shifted (see Non-Patent Document 2).
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sensor data detection time correction apparatus capable of correcting a sensor detection time with reference to a standard time with high accuracy.

  According to the first aspect of the present invention, a means for acquiring a sensor value sent from an external sensor, and a system time when the sensor value is acquired is assigned to the acquired sensor value as a sensor detection time. Means for storing a set of the acquired sensor value and the assigned sensor detection time, a means for acquiring a standard time from the outside, and a sensor value after the time when the previous sensor detection time is corrected Based on the time of correcting the acquired standard time, the system time when the standard time is acquired, the extracted sensor detection time and the previous sensor detection time Means for calculating the correction amount of the extracted sensor detection time, and means for storing the calculated correction amount of the sensor detection time in association with the acquired sensor value. A sensor data detection time correction device, which is characterized in that.

According to a second aspect of the present invention, in the first aspect, the correction amount is based on a time obtained by correcting the previous sensor detection time as a difference between the standard time and the system time when the standard time is acquired. A sensor data detection time correction apparatus, wherein the sensor data detection time correction apparatus is determined in proportion to the elapsed time of the extracted sensor detection time.
According to the third aspect of the present invention, a means for acquiring a sensor value sent from an external sensor, and a system time when the sensor value is acquired is added to the acquired sensor value as a sensor detection time. Means for storing the set of the acquired sensor value and the assigned sensor detection time, means for detecting a processing load value of the system, and the detected processing load value includes the processing load. A means for assigning a system time when a value is detected as a load detection time, a means for storing a set of the detected processing load value and the assigned load detection time, and obtaining a standard time from the outside Means for extracting a start time and an end time of a processing load detection time of a set having a processing load value equal to or greater than a predetermined threshold from a set of the stored processing load value and the load detection time; , Means for extracting the sensor detection time included in the end time from the extracted start time, and the acquired standard time and the standard time from the set of stored sensor value and sensor detection time Means for calculating a correction amount of the extracted sensor detection time based on the system time, the extracted sensor detection time, and the extracted start time and end time. A detection time correction device;

  ADVANTAGE OF THE INVENTION According to this invention, the sensor data detection time correction apparatus which can correct | amend a sensor detection time accurately with reference to standard time can be provided.

Hereinafter, a sensor data detection time correction apparatus according to an embodiment of the present invention will be described with reference to the drawings.
<First embodiment>
FIG. 1 is a diagram showing a configuration of a sensor data detection time correction apparatus according to the first embodiment of the present invention.
As shown in the figure, the data collector 1 according to the embodiment of the present invention includes a sensor data acquisition unit 11, a system time giving unit 12, a system time management unit 13, a sensor detection time correction amount calculation unit 14, and a database 15. have.

  The sensor data acquisition unit 11 acquires a sensor value from the pressure sensor 2 that monitors an external monitoring target, and outputs the sensor value to the system time giving unit 12. In this embodiment, a pressure sensor will be described, but it goes without saying that the present invention can be applied to other types of sensors.

  The system time giving unit 12 receives the sensor value sent from the sensor data acquisition unit 11 and receives the system time sent from the system time management unit 13 when the sensor value is received as the sensor detection time. Assigned to the value and stored in the database 15.

  The sensor detection time correction amount calculation unit 14 is based on the standard time sent from the external time server 3, the system time sent from the system time management unit 13, and the like according to the embodiment of the present invention. A calculation process of the data detection time correction amount is performed. This detection time correction amount calculation process will be described later.

The database 15 stores a sensor data table (FIGS. 4 and 5) including a set of sensor data detection time, sensor type, sensor ID, sensor value, sensor correction amount, and the like.
Hereinafter, the operation of the sensor data detection time correction apparatus according to the first embodiment of the present invention will be described with reference to the flowcharts of FIGS.

FIG. 2 is a flowchart for explaining the operation of the system time giving unit 12.
When the sensor data acquisition unit 11 starts acquiring the sensor value of the sensor data sent from the external pressure sensor 2 (S1), the system time giving unit 12 acquires the sensor value from the sensor data acquisition unit 11 (S2). .

  Then, the system time giving unit 12 acquires the system time from the system time managing unit 13, gives the acquired sensor value as the sensor detection time (S3), and sets a combination of the sensor value and the sensor detection time (system time). It adds to the sensor data table of database 15 (S4). FIG. 4 is a diagram showing a sensor data table stored in the database 15.

  As shown in the figure, the sensor data table stores a set of sensor detection time, sensor type, sensor ID, sensor value, and sensor detection time correction amount. The sensor detection time correction amount is calculated by a correction amount calculation process to be described later, and data stored from the system time management unit 13 includes a sensor detection time, a sensor type, a sensor ID, and a sensor value.

  In the figure, the sensor value at the sensor detection time “9:55:00” has been calculated by the previous time correction amount calculation process, and the sensor values after the sensor detection time “10:02:04” are calculated. Newly added. In addition, about the sensor type and sensor ID, you may use what is contained in sensor data, and you may set beforehand, and the method is not ask | required.

FIG. 3 is a flowchart for explaining the operation of the sensor detection time correction amount calculation unit 14.
When the time correction process is started, the sensor detection time correction amount calculation unit 14 periodically acquires the standard time from the time server 3, and the system time correction amount of the system time from the system time management unit 13 is expressed by the following equation (1). ) Based on ().

T = Tst−Tsys (1)
Here, T: system time correction amount, Tsys: system time, Tst: standard time. In the present embodiment, for example, Tsys = 10: 20: 00, Tst = 10: 30: 30, and T = 10 (minutes).
Next, the sensor detection time after the previously corrected time is extracted from the sensor data table (S12). In the present embodiment, for example, if the previous correction time Tbf = 10: 00: 00: 00, sensor detection times after the sensor detection time “10:02:04” are extracted in FIG.

  Thereafter, a sensor detection time correction amount is calculated for each extracted sensor detection time based on the following equation (2), and the calculated correction amount is added to the sensor data table (S13). FIG. 5 is a diagram showing a sensor data table in which a sensor detection time correction amount is added to the sensor value added in FIG.

dTsense (t)
= T * (Tsense (t) -Tbf) / (Tsys-Tbf) (2)
here,
dTsense (t): correction amount of sensor detection time at time t Tsys: system time when standard time is acquired Tsense (t): sensor detection time at extracted time t Tbf: time corrected last time.

As can be seen from Equation (2), the correction amount is apportioned to the elapsed time based on the previously corrected time.
Therefore, according to the embodiment of the present invention, the correction amount can be calculated with high accuracy by determining the sensor detection time correction amount proportionally to the elapsed time with the previously corrected time as a base point.
<Second Embodiment>
Next, a sensor data detection time correction apparatus according to the second embodiment of the present invention will be described.

  FIG. 6 is a diagram showing a configuration of a sensor data detection time correction apparatus according to the second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and different parts are described here. That is, the present embodiment is different in that a correction amount calculation process and a processing load value monitoring unit 22 in the sensor detection time correction amount calculation unit 21 are newly provided.

  The processing load value monitoring unit 22 periodically monitors the processing load value of the data collector 1 and associates the processing load value with the system time (load detection time) at the time of load detection in the processing load value table in the database. Remember. FIG. 9 is a diagram illustrating an example of a processing load value table, and FIG. 10 is a diagram illustrating an example of a sensor data table. In the present embodiment, as shown in FIG. 9, the processing load value is detected every 5 minutes, for example.

FIG. 7 is a flowchart for explaining the operation of the processing load value monitoring unit.
As shown in the figure, when the processing load value monitoring unit 22 acquires the processing load value of the data collector (S21), it acquires the system time from the system time management unit 13, and assigns it to the processing load value as the load detection time. (S22). Then, the acquired processing load value and the assigned load detection time are added to the processing load value table on the database shown in FIG. 9 (S23), and the processing returns to S21.

Next, the operation of the sensor detection time correction amount calculation unit according to the embodiment of the present invention will be described with reference to the flowchart of FIG.
When the time correction process is started, the sensor detection time correction amount calculation unit 21 periodically acquires the standard time from the time server 3, and the system time correction amount of the system time from the system time management unit 13 is expressed by equation (1). (S31).

  Next, the start time, end time, and elapsed time of the processing load detection time when the processing load value is equal to or greater than the threshold value are calculated from the processing load value table (S32). Here, the elapsed time means the time from the start time to the end time of the processing load detection time when the processing load value is equal to or greater than the threshold value.

  In the present embodiment, as shown in the processing load value table of FIG. 9, the start time Tmod_st = 10: 10: 00, the end time Tmod_fin = 10: 20: 00, and the elapsed time Tmod = 10 minutes. In the present embodiment, there is only one start and end time. However, when there are a plurality of times when the processing load is equal to or greater than the threshold, it goes without saying that the start and end times are plural.

  Next, a sensor detection time in which the sensor detection time is between the start time and end time calculated in S32 is searched from the sensor data table (S33), and the processing load value is a threshold value after the previously corrected time. The value of the sensor having the sensor detection time at the above time is searched (S34). FIG. 10 shows sensor values searched in S34.

  Next, the sensor detection is performed on the sensor value to be corrected, that is, the sensor value at the sensor detection time at the time (start time Tmod_st to end time Tmod_fin) after the last corrected time and the processing load value is equal to or greater than the threshold value. A time correction value is calculated based on the following equation (3).

dTsense (t)
= T * (Tsense (t) -Tmod_st) / Tmod
Tmod = Tmod_fin−Tmod_st (3)
here,
dTsense (t): sensor detection time correction amount at time t T: system time correction amount (= Tst (standard time) −Tsys (system time))
Tst: Standard time Tsys: System time when the standard time is acquired Tsense (t): Sensor detection time at the searched time t Tmod_st: Start time of the processing load detection time when the processing load value is equal to or greater than the threshold Tmod_fin: End time Tbf of the processing load detection time when the processing load value is equal to or greater than the threshold value Tbf: Time corrected last time.

Thereafter, the calculated correction amount is added to the sensor data table (S36). FIG. 11 is a diagram illustrating an example in which the sensor detection time correction amount calculated for the sensor value having the sensor detection time searched in FIG. 10 is added to the sensor data table.
In the present embodiment, a case has been described in which a sensor value that is a target for calculating a sensor detection time correction amount is extracted using a processing load amount as a reference. However, the reference target is not limited to this. For example, a temperature value by a temperature sensor may be used as a reference.

Therefore, according to the embodiment of the present invention, it is possible to correct only the detection time of the sensor value that needs to be corrected by referring to the processing load amount and the like, and as a result, when correcting uniformly As compared with this, the sensor detection time can be corrected more accurately.
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  In addition, the method described in the embodiment uses, as a program (software means) that can be executed by a computer (computer), for example, a magnetic disk (hard disk, etc.), an optical disk (CD-ROM, DVD, MO, etc.), a semiconductor memory, etc. It can also be stored in a recording medium such as (ROM, RAM, flash memory, etc.), or transmitted and distributed via a communication medium. The program stored on the medium side includes a setting program that configures in the computer software means (including not only the execution program but also a table and data structure) to be executed by the computer. A computer that implements this apparatus reads a program recorded on a recording medium, constructs software means by a setting program as the case may be, and executes the above-described processing by controlling the operation by this software means. The recording medium referred to in this specification is not limited to the distribution, but includes a storage medium such as a magnetic disk or a semiconductor memory provided in a computer or a device connected via a network.

It is a figure which shows the structure of the sensor data detection time correction apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart for demonstrating operation | movement of a system time provision part. It is a flowchart for demonstrating operation | movement of a sensor detection time correction amount calculation part. It is a figure which shows the sensor data table stored in a database. FIG. 5 is a diagram showing a sensor data table in which a sensor detection time correction amount is added to the sensor value added in FIG. 4. It is a figure which shows the structure of the sensor data detection time correction apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of a process load value monitoring part. It is a flowchart for demonstrating operation | movement of a sensor detection time correction amount calculation part. It is a figure which shows a processing load value table. It is a figure which shows the sensor data table which showed the sensor value used as correction | amendment object. It is a figure which shows the sensor data table which wrote sensor detection time correction amount with respect to the sensor value used as correction | amendment object.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Data collector, 2 ... Pressure sensor, 3 ... Time server, 11 ... Sensor data acquisition part, 12 ... System time provision part, 13 ... System time management part, 14 ... Sensor detection time correction amount calculation part, 15 ... Database 22 ... Processing load value monitoring unit.

Claims (7)

Means for acquiring a sensor value sent from an external sensor;
Means for providing the acquired sensor value with a system time when the sensor value is acquired as a sensor detection time;
Means for storing a set of the acquired sensor value and the assigned sensor detection time;
Means for obtaining the standard time from the outside;
Means for extracting a set of sensor value and sensor detection time after the time when the previous sensor detection time was corrected;
Based on the acquired standard time, the system time when the standard time is acquired, the extracted sensor detection time, and the time when the previous sensor detection time is corrected, the correction amount of the extracted sensor detection time is calculated. Means for calculating;
A sensor data detection time correction apparatus comprising: means for storing the calculated correction amount of the sensor detection time in association with the acquired sensor value.   The correction amount is determined by dividing the difference between the standard time and the system time when the standard time is acquired by dividing the elapsed time of the extracted sensor detection time based on the time obtained by correcting the previous sensor detection time. The sensor data detection time correction apparatus according to claim 1. Means for acquiring a sensor value sent from an external sensor;
Means for providing the acquired sensor value with a system time when the sensor value is acquired as a sensor detection time;
Means for storing a set of the acquired sensor value and the assigned sensor detection time;
Means for detecting the processing load value of the system;
Means for giving the detected processing load value a system time when the processing load value is detected as a load detection time;
Means for storing a set of the detected processing load value and the assigned load detection time;
Means for obtaining the standard time from the outside;
Means for extracting a start time and an end time of a processing load detection time of a set whose processing load value is equal to or greater than a predetermined threshold from a set of the stored processing load value and the load detection time;
Means for extracting a sensor detection time included in an end time from the extracted start time from the set of the stored sensor value and sensor detection time;
Based on the acquired standard time, the system time when the standard time is acquired, the extracted sensor detection time, the extracted start time and end time, the correction amount of the extracted sensor detection time is calculated. A sensor data detection time correction apparatus comprising: means for calculating.   The calculation of the correction amount is determined by dividing a difference between a standard time and a system time when the standard time is acquired into an elapsed time between the extracted start time and an end time. Item 4. The sensor data detection time correction device according to Item 3. Means for acquiring a sensor value sent from an external sensor;
Means for providing the acquired sensor value with a system time when the sensor value is acquired as a sensor detection time;
Means for storing a set of the acquired sensor value and the assigned sensor detection time;
In a sensor data detection time correction method in a sensor data detection time correction device comprising means for acquiring a standard time from the outside,
Extract a set of sensor value and sensor detection time after the time when the previous sensor detection time was corrected,
Based on the acquired standard time, the system time when the standard time is acquired, the extracted sensor detection time, and the time when the previous sensor detection time is corrected, the correction amount of the extracted sensor detection time is calculated. Calculate
A sensor data detection time correction method, wherein the calculated sensor detection time correction amount is stored in association with the acquired sensor value.   The correction amount is determined by dividing the difference between the standard time and the system time when the standard time is acquired by dividing the elapsed time of the extracted sensor detection time based on the time obtained by correcting the previous sensor detection time. 6. The sensor data detection time correction method according to claim 5. Means for acquiring a sensor value sent from an external sensor;
Means for obtaining the standard time from the outside;
Means for providing the acquired sensor value with a system time when the sensor value is acquired as a sensor detection time;
In a sensor data detection time correction method in a sensor data detection time correction device comprising means for storing a set of the acquired sensor value and the assigned sensor detection time,
Detect the processing load value of the system,
A system time when the processing load value is detected is assigned to the detected processing load value as a load detection time,
A set of the detected processing load value and the assigned load detection time is stored,
From the set of the stored processing load value and the load detection time, the start time and the end time of the processing load detection time of the set whose processing load value is equal to or greater than a predetermined threshold are extracted,
From the stored sensor value and sensor detection time, extract the sensor detection time included in the end time from the extracted start time,
Based on the acquired standard time, the system time when the standard time is acquired, the extracted sensor detection time, the extracted start time and end time, the correction amount of the extracted sensor detection time is calculated. A sensor data detection time correction method comprising calculating the sensor data detection time.

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