WO2022202436A1 - 計測データ同期方法、試験方法、及びコンピュータプログラム - Google Patents
計測データ同期方法、試験方法、及びコンピュータプログラム Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/27—Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- G06F11/3065—Monitoring arrangements determined by the means or processing involved in reporting the monitored data
- G06F11/3072—Monitoring arrangements determined by the means or processing involved in reporting the monitored data where the reporting involves data filtering, e.g. pattern matching, time or event triggered, adaptive or policy-based reporting
- G06F11/3075—Monitoring arrangements determined by the means or processing involved in reporting the monitored data where the reporting involves data filtering, e.g. pattern matching, time or event triggered, adaptive or policy-based reporting the data filtering being achieved in order to maintain consistency among the monitored data, e.g. ensuring that the monitored data belong to the same timeframe, to the same system or component
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- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0808—Diagnosing performance data
Definitions
- the present invention relates to a measurement data synchronization method, test method, and computer program. More specifically, the present invention relates to a measurement data synchronization method, a test method, and a computer program for synchronizing time-series data output from a plurality of measuring instruments by a computer.
- the timing for activating each measuring instrument differs depending on the content of the test.
- many commonly used measuring instruments do not have a function of synchronizing operation with other measuring instruments. Therefore, in order for a computer to analyze a plurality of measurement data obtained by each measuring instrument, it is necessary to perform preprocessing for synchronizing the plurality of measurement data. Conventionally, such synchronization of measurement data has been performed manually by an operator, which takes a long time and may cause variations in test results.
- FIG. 8 shows an example of the output of the measuring instrument (see the thin solid line) when the stepped reference signal (see the thin dashed line) is input to the measuring instrument.
- the thick dashed line indicates the measurement data obtained by performing the processing described in Patent Document 2 on the measurement data indicated by the thin solid line.
- the measurement data of the measuring instrument generally contains harmonic noise and offset, so the rising point cannot be extracted with high accuracy. Therefore, as shown in Patent Document 1, it is conceivable to remove harmonic noise and offset from the measurement data by performing differentiation processing, integration processing, and harmonic elimination processing using a low-pass filter on the measurement data. .
- the thick dashed line in FIG. 8 when a low-pass filter is applied to the measurement data to remove high-frequency components, the rising edge is delayed and the rising point cannot be extracted with high accuracy. You won't be able to sync them well.
- An object of the present invention is to provide a measurement data synchronization method, a test method, and a computer program that can accurately synchronize time-series data output from a plurality of measuring instruments.
- a measurement data synchronization method synchronizes time-series data output from a plurality of measuring instruments (eg, measuring instruments 31 to 35 described later) by a computer (eg, a data analysis device 5 described later).
- a step of obtaining reference data which is time-series data output from each of the plurality of measuring instruments when a reference signal including a steady section and a rising section is simultaneously input to the plurality of measuring instruments; generating a plurality of pieces of filtered data by performing median filtering for extracting a median value within a predetermined time width on the reference data; and obtaining rising timing information from each of the pieces of filtered data and synchronizing the time-series data output from the plurality of measuring instruments based on the plurality of rise timing information.
- the time width is adjusted so that the signal values included in the stationary section in the post-filtering data fall within a predetermined range over the evaluation time. is preferred.
- the reference data in the step of acquiring the reference data, a signal that changes in a ramp shape in the rising section is used as the reference signal, and in the step of generating the filtered data, the reference data is differentiated. It is preferable to perform the median filter process after performing the above.
- the step of acquiring the rise timing information it is preferable to acquire the time at which the signal value exceeds a predetermined threshold value in the post-filtering data as the rise time.
- a signal that changes in a ramp shape in the rising section is used as the reference signal
- the A slope and an intercept of a linear function generated based on a plurality of signal values included in the rising interval are calculated, and a delay time at a rising portion of the filtered data is calculated based on the slope and the intercept. preferable.
- the test method according to the present invention processes time-series data output from a plurality of measuring instruments (eg, measuring instruments 31 to 35 described later) with a computer (eg, data analysis device 5 described later).
- a method for evaluating the performance of a test piece wherein when a reference signal including a steady section and a rising section is simultaneously input to the reference signal channel of each of the plurality of measuring instruments, when output from each measuring instrument Measurement data, which is time-series data output from each of the plurality of measuring instruments when reference data, which is series data, and a signal correlated with the state of the test piece are input to each of the measuring channels of the plurality of measuring instruments.
- reference data which is time-series data output from each measuring instrument
- a plurality of reference data are obtained.
- a plurality of filtered data are generated by applying median filtering to extract the median value within a predetermined time width, rising timing information is obtained from each of the filtered data, and the rising timing information is used as Synchronize time-series data output from multiple measuring instruments based on
- high-frequency noise can be removed without delaying the rise of the signal contained in the reference data by applying median filtering to each reference data. Therefore, according to the present invention, the rise timing information can be obtained with high accuracy by using the filtered data generated through the median filtering process, so that the time-series data output from each measuring instrument can be synchronized with high accuracy. can be done.
- the rise is delayed by adjusting the time width in the median filtering process so that the signal values included in the stationary section of the filtered data fall within a predetermined range over the evaluation time. Therefore, it is possible to appropriately remove sudden noise such as impulsive noise.
- a signal that changes in a ramp shape in the rising section is used as a reference signal, and after performing differentiation processing on the reference data, median filtering is performed to generate filtered data.
- the offset component contained in the measurement data can be removed without causing a delay in the rising edge of the measurement data of each measuring instrument.
- the time-series data of the measuring instruments can be accurately synchronized. can.
- the rise time can be obtained by a simple calculation by obtaining the time when the signal value exceeds a predetermined threshold value in the filtered data as the rise time.
- the slope and intercept of a linear function generated based on a plurality of signal values included in the rising section of the filtered data are generated using a signal that changes like a ramp in the rising section as the reference signal. is calculated, and the delay time of the rising portion of the post-filtering data is calculated based on these slopes and intercepts.
- time-series data of each measuring instrument can be synchronized with higher accuracy by using the delay time of the rise point calculated in this manner.
- reference data which is time-series data output from each measuring instrument when a reference signal including a steady section and a rising section is simultaneously input to each reference signal channel of a plurality of measuring instruments
- measurement data which is time-series data output from each measuring instrument when a signal correlated with the state of the specimen is input to each measuring channel of the plurality of measuring instruments.
- a plurality of pieces of filtered data are generated by subjecting a plurality of pieces of reference data to median filtering, rising timing information is obtained from each piece of filtered data, and based on the rising timing information, Synchronize the time-series data output from a plurality of measuring instruments, and evaluate the performance of the specimen based on the plurality of synchronized measurement data.
- high-frequency noise can be removed without delaying the rise of the signal contained in the reference data by applying median filtering to each reference data. Therefore, according to the present invention, by using the filtered data generated through the median filtering process, it is possible to acquire the rise timing information with high accuracy, so that the measurement data output from each measuring instrument can be synchronized with high accuracy. Therefore, it is possible to evaluate the performance of the specimen with high accuracy.
- FIG. 4 is a diagram showing an example of a reference signal
- FIG. 4 is a diagram showing an example of a reference signal
- FIG. 4 is a flow chart showing specific procedures of a measurement data synchronization method and a test method
- FIG. 10 is a diagram for explaining the effect of median filtering
- It is an example of plotting the first to fifth filtered data on the same time axis.
- 9 is a flow chart showing specific procedures of a measurement data synchronization method and a test method according to a second embodiment of the present invention
- FIG. 11 is a diagram for explaining a procedure for calculating delay times of rising points of first and second filtered data
- FIG. 4 is a diagram showing an example of an output of a measuring instrument when a stepped reference signal is input to the measuring instrument;
- FIG. 1 is a diagram showing the configuration of a test system S to which the measurement data synchronization method and test method according to this embodiment are applied.
- the test system S uses an electric vehicle V that runs using electric energy, such as a secondary battery electric vehicle, a fuel cell vehicle, a hybrid vehicle, and a plug-in hybrid vehicle, as a test object, and evaluates the performance of this electric vehicle V. It is a device that
- the test system S includes a chassis dynamometer system 1 on which the electric vehicle V is mounted, a dilution tunnel 2 through which the exhaust gas discharged from the exhaust pipe of the electric vehicle V flows, the electric vehicle V, and the vicinity of the electric vehicle V.
- a measuring instrument group 3 that generates various data based on detection signals from a plurality of attached sensors and signals transmitted from the chassis dynamometer system 1, and various calculations are performed using the data generated by the measuring instrument group 3. and a data analysis device 5 for performing.
- the chassis dynamometer system 1 includes a plurality of rollers 11 provided below the electric vehicle V so as to be in contact with driving wheels of the electric vehicle V on their outer peripheral surfaces, a plurality of dynamometers 12 connected to the rollers 11, and a control device 13 that controls the dynamometer 12 so that an appropriate load is applied to the electric vehicle V traveling on the rollers 11 .
- a driver of the electric vehicle V drives the electric vehicle V according to a driving pattern (for example, a vehicle speed pattern) displayed on a driver's aid (not shown).
- a driving pattern for example, a vehicle speed pattern
- the measuring instrument group 3 includes a plurality of measuring instruments 31, 32, 33, 34, and 35 for measuring various physical quantities correlated with the state of the electric vehicle V during running, and data measured by these measuring instruments 31 to 35. and a reference signal generator 38 for generating a reference signal for synchronizing the .
- Each of these measuring instruments 31 to 35 is multi-channel having at least a measuring channel and a reference signal channel.
- the reference signal generator 38 is connected to the reference signal channels of the measuring instruments 31-35.
- the reference signal generated by the reference signal generator 38 is input to the reference signal channel of each of the measuring instruments 31-35.
- the first measuring instrument 31 is a device for mainly measuring environmental information (for example, room temperature, humidity, wind speed, atmospheric pressure, etc.) of the electric vehicle V. Various sensors necessary for measuring the environmental information are connected to the measurement channel of the first measuring device 31 .
- the first measuring instrument 31 is the first reference data, which is the time-series data of the reference signal input to the reference signal channel, and the time-series data of the environmental information generated based on the input signal to the measurement channel, and a first data file 31d including first measurement data synchronized with the first reference data;
- the second measuring instrument 32 is a device for mainly measuring electric power information (for example, current, voltage, electric energy, etc.) of the electric vehicle V and the external power supply. Various sensors necessary for measuring the power information are connected to the measurement channel of the second measuring device 32 .
- the second measuring instrument 32 is the second reference data, which is the time-series data of the reference signal input to the reference signal channel, and the time-series data of power information generated based on the input signal to the measurement channel, and a second data file 32d containing second measurement data synchronized with the second reference data;
- the third measuring device 33 is a device for mainly measuring travel information (for example, speed, travel distance, etc.) and exhaust gas information of the electric vehicle V.
- the control device 13 of the dynamometer system 1 and various sensors necessary for measuring exhaust gas information are connected to the measurement channel of the third measuring device 33 .
- the third measuring device 33 provides third reference data, which is time-series data of the reference signal input to the reference signal channel, and time-series data of travel information and exhaust gas information generated based on the input signal to the measurement channel. and third measurement data synchronized with the third reference data.
- the fourth measuring device 34 is a device for measuring monitor information (for example, battery SOC, etc.) mainly monitored by the onboard computer of the electric vehicle V.
- An in-vehicle computer of the electric vehicle V is connected to the measurement channel of the fourth measuring device 34 .
- the fourth measuring instrument 34 is time-series data of monitor information generated based on the fourth reference data, which is the time-series data of the reference signal input to the reference signal channel, and the input signal to the measurement channel, and a fourth data file 34d containing fourth measurement data synchronized with the fourth reference data;
- the fifth measuring instrument 35 is a device for mainly measuring exhaust gas information of the electric vehicle V.
- a sensor provided in the dilution tunnel 2 is connected to the measurement channel of the fifth measuring device 35 .
- the fifth measuring instrument 35 is time-series data of exhaust gas information generated based on fifth reference data, which is time-series data of the reference signal input to the reference signal channel, and the input signal to the measurement channel, and A fifth data file 35d including fifth measurement data synchronized with the fifth reference data is output.
- the reference signal generation device 38 generates a reference signal including at least a steady section and a rising section in response to an operator's operation, and simultaneously inputs it to the reference signal channels of the measuring instruments 31 to 35 .
- the reference signal generating device 38 generates a reference signal according to manual operation by an operator, but the present invention is not limited to this.
- the reference signal generator 38 may generate the reference signal in conjunction with the driver's aid start signal.
- FIG. 2A and 2B are diagrams showing examples of reference signals.
- FIG. 2A shows an example of a step-like change in the rising section
- FIG. 2B shows an example of a ramp-like change in the rising section.
- the data analysis device 5 includes arithmetic processing means such as a CPU (Central Processing Unit), auxiliary devices such as HDDs (Hard Disk Drives) and SSDs (Solid State Drives) that store data files 31d to 35d and various programs.
- Memory means main memory means such as RAM (Random Access Memory) for storing data temporarily required by the arithmetic processing means to execute the program, operation means such as a keyboard for the operator to perform various operations, and the operator It is a computer configured by hardware such as display means such as a display for displaying various information.
- FIG. 3 is a flow chart showing specific procedures of the measurement data synchronization method and test method. Each step shown in the flowchart of FIG. 3 is implemented by executing a computer program installed in the data analysis device.
- each data file correlates the reference data output from each measuring instrument with the state of the electric vehicle when the reference signal is simultaneously input to the respective reference signal channels of the first to fifth measuring instruments. and measurement data output from each measuring instrument when a certain signal is input to each measuring channel of the first to fifth measuring instruments.
- a signal that changes in a ramp shape in the rising section as shown in FIG. 2B is used as the reference signal.
- step ST2 the data analysis device performs differentiation processing on the first to fifth reference data acquired in step ST1, and proceeds to step ST3. This removes the offset in the stationary section of the first to fifth reference data.
- step ST3 the data analysis device applies median filter processing for extracting the median value within a predetermined time width (2K+1) to the first to fifth reference data that have undergone the differential processing in step ST2.
- the first to fifth filtered data are generated, and the process proceeds to step ST4.
- the median filter processing means that for filter input x(n) (n is an integer), which is one-dimensional time-series data, within a time width of 2K+1 (K is an integer), (the K+1th largest value among x(n ⁇ K), .
- y(n) MED[x(n-K), x(n-K+1), ..., x(n), ..., x(n+K)] (1)
- step ST4 the data analysis device determines that the signal values included in the stationary section among the first to fifth post-filtering data generated under a predetermined time width (2K+1) in step ST3 are evaluated over a predetermined evaluation time. It is determined whether or not the value falls within a range between a positive upper limit value and a negative lower limit value centered at value 0 (see FIG. 4 described later).
- the data analysis apparatus widens the time width in the median filtering process by counting up the value of the integer K (step ST5), and then returns to step ST3. Further, when the determination result in step ST4 is YES, the data analysis device proceeds to step ST6.
- FIG. 4 is a diagram for explaining the effect of median filtering in steps ST3 to ST5.
- FIG. 4 shows reference data (see thin solid line) output from the measuring instrument when a stepped reference signal (see thin dashed line) is input to the reference signal channel of the measuring instrument. shows an example of In FIG. 4, the thick dashed line indicates filtered data obtained by performing the processes shown in steps ST3 to ST5 on the reference data indicated by the thin solid line.
- the first to fifth reference data output from the first to fifth measuring instruments contain harmonic noise.
- median filtering is performed so that the signal values included in the stationary section fall within a predetermined range between the positive upper limit value and the negative lower limit value centered at 0.
- the time width (2K+1) By adjusting the time width (2K+1), fluctuations in the signal value in the stationary section can be reduced.
- the present invention by performing median filtering on the reference data to generate filtered data, the original data can be restored while removing harmonic noise. The filtered data can be generated without delaying the reference data.
- step ST6 the data analysis device calculates rising timing information from each of the first to fifth filtered data calculated in step ST4, and proceeds to step ST7.
- the rise timing information is information regarding the timing at which the signal value rises in each post-filtering data.
- FIG. 5 is an example of plotting the first to fifth filtered data on the same time axis. To facilitate understanding, illustration of harmonic noise included in each post-filtering data is omitted in the example shown in FIG. As described above, since the first to fifth measuring instruments are not operated synchronously, the rise timings of the signal values in the post-filtering data are not uniform.
- step ST6 the data analysis device performs the first rising time t1, which is the time when the signal value exceeds the threshold indicated by the dashed line in FIG.
- a second rising time t2, a third rising time t3, a fourth rising time t4, and a fifth rising time t5 are calculated as rising timing information. Therefore, in the example shown in FIG. 5, the second reference data can be synchronized with the first reference data by advancing the second reference data by time (t2-t1), and the third reference data is advanced by time (t1-t1).
- t3 By delaying by t3), the third reference data can be synchronized with the first reference data, and by advancing the fourth reference data by time (t4-t1), the fourth reference data and the first reference data can be synchronized.
- step ST7 the data analysis device synchronizes the first to fifth measurement data acquired in step ST1 based on the first to fifth rising times calculated in step ST6.
- the first to fifth reference data are synchronized with the first to fifth measurement data, respectively. can be synchronized.
- step ST8 the data analysis device evaluates the performance of the electric vehicle by performing predetermined calculations using the first to fifth measurement data synchronized in step ST7.
- the first to fifth reference signals which are time-series data output from each measuring instrument when a reference signal including a steady section and a rising section is simultaneously input to the first to fifth measuring instruments Data is acquired, median filtering is performed on the first to fifth reference data to generate first to fifth post-filtering data, and from each of the first to fifth post-filtering data, the first The first to fifth rise times are calculated, and the first to fifth measurement data output from the first to fifth measuring instruments are synchronized based on these first to fifth rise times.
- the time width in median filtering is adjusted so that the signal values included in the stationary section of the first to fifth filtered data fall within a predetermined range over the evaluation time. Sudden noise such as impulsive noise can be appropriately removed without delaying the rise of the signal value, and as a result, the first to fifth measurement data can be accurately synchronized.
- a signal that changes in a ramp-like manner in the rising section is used as the reference signal, and the first to fifth reference data are differentiated and then subjected to median filtering to obtain the first to fifth reference data.
- 5 Generate filtered data.
- the offset components contained in the first to fifth measurement data can be removed without delaying the rise of the first to fifth measurement data of the first to fifth measuring instruments.
- the first to fifth measurement data can be synchronized with high accuracy.
- the rising time can be obtained by a simple calculation.
- reference data which is time-series data output from each measuring instrument when a reference signal including a steady section and a rising section is simultaneously input to each reference signal channel of a plurality of measuring instruments
- measurement data which is time-series data output from each measuring instrument when a signal correlated with the state of the specimen is input to each measuring channel of the plurality of measuring instruments.
- a plurality of pieces of filtered data are generated by subjecting a plurality of pieces of reference data to median filtering, rising timing information is obtained from each piece of filtered data, and based on the rising timing information, Synchronize the time-series data output from a plurality of measuring instruments, and evaluate the performance of the specimen based on the plurality of synchronized measurement data.
- high-frequency noise can be removed without delaying the rise of the signal contained in the reference data by applying median filtering to each reference data. Therefore, according to the present invention, by using the filtered data generated through the median filtering process, it is possible to acquire the rise timing information with high accuracy, so that the measurement data output from each measuring instrument can be synchronized with high accuracy. Therefore, it is possible to evaluate the performance of the specimen with high accuracy.
- FIG. 6 is a flow chart showing specific procedures of the measurement data synchronization method and test method according to this embodiment. Since steps ST11 and ST17 in FIG. 6 are the same as steps ST1 and ST8 in FIG. 3, detailed description thereof will be omitted. In the following, a case will be described in which a signal that changes in a ramp shape in the rising section as shown in FIG. 2B is used as the reference signal.
- step ST12 the data analysis device applies the median filtering described with reference to equation (1) to the first to fifth reference data acquired in step ST11, thereby obtaining the following after the first to fifth filtering: Generate data and move to step ST13.
- step ST13 the data analysis device determines that the signal values included in the stationary section among the first to fifth post-filtering data generated under a predetermined time width (2K+1) in step ST12 are evaluated over a predetermined evaluation time. It is determined whether or not it falls within the range between the positive upper limit value and the negative lower limit value (see FIG. 4 described above) centering on the value 0.
- the data analysis apparatus widens the time width in the median filtering process by counting up the value of the integer K (step ST14), and then returns to step ST12. Further, when the determination result in step ST13 is YES, the data analysis device proceeds to step ST15. That is, the present embodiment differs from the first embodiment in that the first to fifth post-filter processing data are generated by performing median filtering on the first to fifth reference data without performing differentiation processing. .
- step ST15 the data analysis device calculates rise timing information from each of the first to fifth filtered data calculated in step ST13, and proceeds to step ST16. More specifically, the data analysis device calculates, from the first to fifth post-filtering data, the delay time of the rising position with respect to each predetermined reference as rising timing information.
- the delay times at the rising positions in the first to fifth post-filtering data are referred to as first to fifth delay times, respectively.
- FIG. 7 is a diagram for explaining the procedure for calculating the delay times ⁇ t1 and ⁇ t2 at the rising points of the first and second filtered data.
- the case where the data after the first filtering process is used as a reference, that is, the case where the first delay time ⁇ t1 is set to 0 will be described.
- the data analysis device extracts the signal value in the rising section from each filtered data (in the example of FIG. 7, the lower limit set to a value slightly larger than 0 and the and the upper limit value) are extracted.
- the data analysis device approximates the functional form in the rising edge of each filtered data by a linear function characterized by two coefficients (slope and intercept), and uses the extracted signal values to obtain a least two-dimensional function. Calculate the slope and intercept of each linear function by multiplication.
- the signal values (Y1, Y2) in the rising section of the first and second filtered data are approximated as linear functions of time (X1i, X2i). Give an example.
- coefficients (a1, a2) are slopes and coefficients (b1, b2) are intercepts.
- Y1 a1*X1i+b1 (2-1)
- Y2 a2*X2i+b2 (2-2)
- the data analysis device calculates the delay time of the rising point with respect to a predetermined reference (first filtered data in this embodiment) by using the slope and intercept calculated from each filtered data. More specifically, when the first filtered data is used as a reference, the second delay time ⁇ t2 is obtained by the following formula (3) using the previously calculated slopes (a1, a2) and intercepts (b1, b2) Calculated by In the following formula (3), it is assumed that the slope (a2) of the linear function in the rising section of the data after the second filtering is equal to the slope (a1) of the linear function in the rising section of the data after the first filtering.
- step ST16 the data analysis device synchronizes the first to fifth measurement data acquired in step ST11 based on the first to fifth delay times calculated in step ST15.
- the first to fifth reference data are synchronized with the first to fifth measurement data, respectively. can be synchronized. That is, when the first reference data is used as a reference (when the first delay time is 0) as described above, by advancing the second to fifth measurement data by the second to fifth delay times, respectively, These first to fifth measurement data can be synchronized.
- a signal that changes in a ramp shape in the rising section is used as the reference signal, and the slope and The intercept is calculated, and the delay time at the rising point of the post-filtering data is calculated based on the slope and the intercept.
- time-series data of each measuring instrument can be synchronized with higher accuracy by using the delay time of the rise point calculated in this manner.
- the present invention is not limited to this.
- a vehicle speed detection signal or a vehicle speed command signal output from a driver's aid may be input to each measuring device 31 to 35 as a reference signal.
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Abstract
Description
以下、本発明の第1実施形態について、図面を参照しながら詳細に説明する。
図1は、本実施形態に係る計測データ同期方法及び試験方法が適用された試験システムSの構成を示す図である。
y(n)=
MED[x(n-K),x(n-K+1),…,x(n),…,x(n+K)] (1)
(1)本実施形態では、定常区間と立ち上がり区間とを含む基準信号を同時に第1~第5計測器へ入力したときに各計測器から出力される時系列データである第1~第5基準データを取得し、これら第1~第5基準データに対しメディアンフィルタ処理を施すことによって第1~第5フィルタ処理後データを生成し、これら第1~第5フィルタ処理後データの各々から第1~第5立ち上がり時刻を算出し、これら第1~第5立ち上がり時刻に基づいて、第1~第5計測器から出力される第1~第5計測データを同期する。特に本実施形態では、各基準データに対しメディアンフィルタ処理を施すことにより、各基準データに含まれる信号の立ち上がりに遅れを生じさせることなく高周波ノイズを除去することができる。よって本実施形態によれば、メディアンフィルタ処理を経て生成された第1~第5フィルタ処理後データを用いることにより、精度良く第1~第5立ち上がり時刻を取得できるので、第1~第5計測器から出力される第1~第5計測データを精度良く同期させることができる。
次に、本発明の第2実施形態について、図面を参照しながら詳細に説明する。
本実施形態は、第1実施形態とデータ解析装置における処理の手順が異なる。
Y1=a1・X1i+b1 (2-1)
Y2=a2・X2i+b2 (2-2)
Δt2=(b2-b1)/a1 (3)
(6)本実施形態では、立ち上がり区間においてランプ状に変化する信号を基準信号として用い、フィルタ処理後データのうち立ち上がり区間内に含まれる複数の信号値に基づいて生成される一次関数の傾き及び切片を算出し、これら傾き及び切片に基づいてフィルタ処理後データの立ち上がり箇所の遅れ時間を算出する。本実施形態によれば、このようにして算出された立ち上がり箇所の遅れ時間を用いることにより、各計測器の時系列データをさらに精度良く同期させることができる。
V…電動車両(供試体)
1…シャシダイナモメータシステム
3…計測器群
31…第1計測器
31d…第1データファイル
32…第2計測器
32d…第2データファイル
33…第3計測器
33d…第3データファイル
34…第4計測器
34d…第4データファイル
35…第5計測器
35d…第5データファイル
38…基準信号生成装置
5…データ解析装置(コンピュータ)
Claims (7)
- 複数の計測器から出力される時系列データをコンピュータによって同期する計測データ同期方法であって、
定常区間と立ち上がり区間とを含む基準信号を同時に前記複数の計測器へ入力したときに、各計測器から出力される時系列データである基準データを取得するステップと、
前記複数の基準データに対し所定の時間幅内の中央値を抽出するメディアンフィルタ処理を施すことにより、複数のフィルタ処理後データを生成するステップと、
前記複数のフィルタ処理後データの各々から立ち上がりタイミング情報を取得するステップと、
前記複数の立ち上がりタイミング情報に基づいて前記複数の計測器から出力される時系列データを同期するステップと、を備えることを特徴とする計測データ同期方法。 - 前記フィルタ処理後データを生成するステップでは、前記フィルタ処理後データのうち前記定常区間に含まれる信号値が評価時間にわたり所定範囲内に収まるように前記時間幅を調整することを特徴とする請求項1に記載の計測データ同期方法。
- 前記基準データを取得するステップでは、前記立ち上がり区間においてランプ状に変化する信号を前記基準信号として用い、
前記フィルタ処理後データを生成するステップでは、前記基準データに対し微分処理を施した後、前記メディアンフィルタ処理を施すことを特徴とする請求項1又は2に記載の計測データ同期方法。 - 前記立ち上がりタイミング情報を取得するステップでは、前記フィルタ処理後データにおいて信号値が所定の閾値を超える時刻を立ち上がり時刻として取得することを特徴とする請求項1から3の何れかに記載の計測データ同期方法。
- 前記基準データを取得するステップでは、前記立ち上がり区間においてランプ状に変化する信号を前記基準信号として用い、
前記立ち上がりタイミング情報を取得するステップでは、前記フィルタ処理後データのうち前記立ち上がり区間内に含まれる複数の信号値に基づいて生成される一次関数の傾き及び切片を算出し、前記傾き及び前記切片に基づいて前記フィルタ処理後データの立ち上がり箇所の遅れ時間を算出することを特徴とする請求項1又は2に記載の計測データ同期方法。 - 複数の計測器から出力される時系列データをコンピュータによって同期させるためのコンピュータプログラムであって、
定常区間と立ち上がり区間とを含む基準信号を同時に前記複数の計測器へ入力したときに、各計測器から出力される時系列データである基準データを取得するステップと、
定常区間と立ち上がり区間とを含む基準信号を同時に前記複数の計測器へ入力した場合に、各々から出力される時系列データを基準データとして取得するステップと、
前記複数の基準データに対し所定の時間幅内の中央値を抽出するメディアンフィルタ処理を施すことにより、複数のフィルタ処理後データを生成するステップと、
前記複数のフィルタ処理後データの各々から立ち上がりタイミング情報を取得するステップと、
前記複数の立ち上がりタイミング情報に基づいて前記複数の計測器から出力される時系列データを同期するステップと、を前記コンピュータに実行させるためのコンピュータプログラム。 - 複数の計測器から出力される時系列データをコンピュータで処理することによって供試体の性能を評価する試験方法であって、
定常区間と立ち上がり区間とを含む基準信号を同時に前記複数の計測器の各々の基準信号用チャンネルへ入力したときに、各計測器から出力される時系列データである基準データと、前記供試体の状態と相関のある信号を前記複数の計測器の各々の計測用チャンネルへ入力したときに、各計測器から出力される時系列データである計測データと、を取得するステップと、
前記複数の基準データに対し所定の時間幅内の中央値を抽出するメディアンフィルタ処理を施すことにより、複数のフィルタ処理後データを生成するステップと、
前記複数のフィルタ処理後データの各々から立ち上がりタイミング情報取得するステップと、
前記複数の立ち上がりタイミング情報に基づいて前記複数の計測データを同期するステップと、
前記同期した複数の計測データに基づいて前記供試体の性能を評価するステップと、を備えることを特徴とする試験方法。
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JPH0283452A (ja) * | 1988-09-21 | 1990-03-23 | Japan Electron Control Syst Co Ltd | 光学式クランク角センサの応答遅れ補正装置 |
JP2002350304A (ja) * | 2001-05-23 | 2002-12-04 | Horiba Ltd | ガス分析装置 |
JP2015228171A (ja) * | 2014-06-02 | 2015-12-17 | 旭化成エレクトロニクス株式会社 | センサシステム及びセンサ並びにセンサ信号出力方法 |
JP2017111123A (ja) * | 2015-12-15 | 2017-06-22 | 株式会社堀場製作所 | 排ガス計測システム |
JP2018013460A (ja) * | 2016-07-22 | 2018-01-25 | ファナック株式会社 | 時刻精度を維持するためのサーバ、方法、プログラム、記録媒体、及びシステム |
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JPH0283452A (ja) * | 1988-09-21 | 1990-03-23 | Japan Electron Control Syst Co Ltd | 光学式クランク角センサの応答遅れ補正装置 |
JP2002350304A (ja) * | 2001-05-23 | 2002-12-04 | Horiba Ltd | ガス分析装置 |
JP2015228171A (ja) * | 2014-06-02 | 2015-12-17 | 旭化成エレクトロニクス株式会社 | センサシステム及びセンサ並びにセンサ信号出力方法 |
JP2017111123A (ja) * | 2015-12-15 | 2017-06-22 | 株式会社堀場製作所 | 排ガス計測システム |
JP2018013460A (ja) * | 2016-07-22 | 2018-01-25 | ファナック株式会社 | 時刻精度を維持するためのサーバ、方法、プログラム、記録媒体、及びシステム |
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