JPH09170937A - Method and device for sampling data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily control a plurality of kinds of sampling times and sampling data. SOLUTION: When a power supply is turned on, a first down-counter, second downcounter and third counter are allowed to hold count values of 20, 6000 and 30000, respectively. When a CPU 50 interrupts the counters every 10ms, the respective counter decrements the holding values. Then the downcounter wherein the holding value becomes zero informs the main CPU 50 of the fact. The CPU 50 identifies which downcounter informs it, and it aquires the kind of data to be sampled from a main RAM 52 at the sampling time when the downcounter counts. Then the obtained data is stored in a 40MB memory part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data sampling method and apparatus for sampling a plurality of types of data at any of a plurality of different time intervals.

[0002]

2. Description of the Related Art Conventionally, when a plurality of types of data are sampled at any of a plurality of different time intervals, timing generation means for generating a sampling time of the data is prepared for each data, and these timing generations are performed. The means were operated individually to perform sampling. In particular, in order to record various data of automobiles, conventionally, since measuring equipment corresponding to each data was individually prepared,
As a matter of course, these data were sampled asynchronously, and the recorded data were managed individually for each measuring device.

[0003]

By the way, in the above-mentioned conventional data sampling method, since the sampling of each data is performed completely independently, the generation means and the sampling means of the reference timing are required for each data. However, there is a drawback that the overall cost becomes high. Further, when the number of channels to be measured is large, there is a drawback that management of correspondence between each channel and the sampling time in the channel becomes complicated, and an operation error or the like is likely to occur. In addition, there is a drawback in that the data obtained by sampling has various formats, so that the data cannot be classified for each sampling time.

The present invention has been made under such a background, and an object thereof is to provide a data sampling method and apparatus capable of easily managing a plurality of types of sampling times and sampling data.

[0005]

According to the first aspect of the present invention,
In a data sampling method of sampling a plurality of types of data at any of N types (N is an integer of 2 or more) of different time intervals, before the start of sampling, the N
Correspondence between the time intervals of the types and the types of data to be sampled at each time interval is stored in the storage means, and when sampling is started, each of the N time intervals is set to a predetermined reference time. The values divided by the intervals are held in association with different down counters, and the time counting means supplies the down counters with a reference signal at the same timing at each of the reference time intervals, and each down counter has
Each time the reference signal is received, each holding value is reduced by a predetermined value to down-count, and the down-counter whose holding value is equal to or less than a predetermined value is a data fetching instruction. To the sampling means, the held value is returned to the value before the start of the down-counting, and when the fetching means receives the data fetching instruction from any of the down-counters, the fetching interval is changed to the time interval corresponding to the down-counter. The type of data to be sampled is read from the storage means and the data is fetched.

According to a second aspect of the invention, in the data sampling method according to the first aspect, the fetching means is
Identification data indicating the time interval for capturing the data is added to the captured data, and after sampling is completed,
On the basis of the added identification data, each data is classified for each time interval taken in.

According to a third aspect of the present invention, in a data sampling apparatus for sampling a plurality of types of data at any one of N types (N is an integer of 2 or more) of different time intervals, the N types of time intervals and Storage means for storing the correspondence with the type of data to be sampled at each time interval, timing means for outputting a reference signal at each predetermined reference time interval, and each of the N kinds of time intervals as the reference From the divided values divided by the time interval, after holding one divided value different from each other, from the time measuring means,
Each time the reference signal is received, the holding value is decremented by a predetermined value to down-count, and when the holding value becomes less than or equal to a predetermined value, a data fetching instruction is sent and then the holding value is down again. Upon receiving a data fetching instruction from any of the N down counters that return the value to the value before the start of counting and any of the down counters, the type of data to be sampled is read from the storage means at a time interval corresponding to the down counter. And a capturing means for capturing the data.

According to a fourth aspect of the invention, in the data sampling apparatus according to the third aspect, the fetching means is
Identification data indicating the time interval for capturing the data is added to the captured data, and after sampling is completed,
It is characterized by further comprising a classifying means for classifying each data on the basis of the added identification data for each time interval in which each data is taken in.

[0009]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of an automobile data recording device (hereinafter referred to as a data logger) that executes a data sampling method according to an embodiment of the present invention. In this figure,
Although the block diagram of the data logger 1 is shown outside the electric vehicle 2, the data logger 1 is actually stored in the trunk portion of the electric vehicle 2 as shown in the figure.

In this figure, the control circuit 3 is
A CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like are control circuits. As shown in FIG.
Main control unit 40 centered on 0 and communication CP
It is composed of a communication control section 41 centering on U / 70. The configuration relating to the control circuit 3 will be described later in detail with reference to FIG. Further, in FIG. 1, the clock IC-4 is used to record the date and time when the data is sampled.

The 40 MB memory section 5 is a battery-backed SRAM, and its storage capacity is 40 megabytes. The battery backup uses the power supplied from the sub-battery 110 of the electric vehicle 2. If the sub-battery 110 does not supply power, the battery (BATT) provided in the data logger 1 is used. The power supplied from 6 is used. IC card I / F.7 is IC card writer 112
Various operation settings for the data logger 1 written in the IC card 111 by the personal computer 113 having the above are read from the IC card 111. In addition, as the operation setting, the communication control unit 4 is used.
1 includes the communication conditions (the number of bits, the presence / absence of parity, the number of stop bits, the channel number, the storage address of communication data, etc.) and the data measurement conditions (the measurement range, the sampling time, etc.).

The RS-232C I / F.8 is a communication I / F for displaying the operating state and abnormality detection contents of the data logger 1 on the external display device 103 provided in the electric vehicle 2.
/ F. The temperature measuring unit 9 measures the temperature of each unit of the main battery 101 by using the thermoelectromotive force generated in the thermocouple. The temperature measuring unit 9 uses TMU with 6-channel input and a resolution of 8 bits or more for each channel.
The temperature is measured in a measurement range of either -50 ° C to 200 ° C or 0 ° C to 1200 ° C. Analog input section 10
Captures the output value (analog value) of the ammeter / acceleration sensor or the like provided on the DC motor 102. The analog input unit 10 takes in the analog value with a resolution of 8 bits or more, and the number of channels is 6.
The measurement range of the analog input unit 10 is 0 to 1 [V], 0 to 5 [V], 0 to 1 for each channel.
It can be set to either 0 [V] or 0 to 20 [V].

The electric vehicle 2 is provided with ECUs (Electrical Control Units) for controlling various functions (ECU 104 to ECU 108). And the ECU
The monitor input unit 11 constantly monitors the control contents of the ECUs 104 to 108. Of these five ECUs 104 to 108, three Es are used as the monitoring channel.
16 channels are assigned to each CU, and 25 channels are assigned to each of the remaining two ECUs.

The SW input section 12 includes an ignition key (IG1) and a charge key (KC) provided on the electric vehicle 2.
HG) 109 ON / OFF is detected. The regulator (REG) 13 generates a power supply voltage of 5 [V] for operating each part of the data logger 1 from the power supply voltage of 12 [V] supplied from the sub-battery 110.

Next, the configurations of the control circuit 3 and its peripheral circuits will be described with reference to FIG. First, the main control unit 40 will be described. Main CPU
A control unit 50 controls each unit of the data logger 1 and stores / reads / holds data in / from the 40 MB memory unit 5. A control program used in the main CPU 50 is stored in the main ROM 51. The main RAM 52 loads the control program and temporarily stores data during execution of the control program.

In addition to the above control program, the main ROM 51 also stores a table called a sampling table. The sampling table will be described below. As described above, this data logger has a large number of channels for recording data. That is, 3 of the 5 ECUs 104 to 108
16 channels each for 1 ECU, 2 remaining Es
Each 25 channels are allocated to the CU, 6 channels are allocated to the analog input, and 6 channels are allocated to the external temperature input. With respect to these channels, data recording is not performed at the same timing in all channels, and the data of each channel is recorded at any of a plurality of preset sampling times. In this data logger-1 the sampling time is 50ms, 100m
s, 200ms, 500ms, 1s, 2s, 5s, 10
Three types of sampling times are selected simultaneously from s, 30s, 1 min, and 5 min, and three down counters (first down counter 64 to third down counter 6) are selected.
6) can be set. Then, all the data obtained from each channel are recorded at every sampling time of these three types. Therefore, in the sampling table, three types of selected sampling times (for example, 200 ms, 1 min, 5 mi) are selected.
n) and the type of data to be recorded at each sampling time (temperature measuring unit 9, analog input unit 10,
A channel number in any one of the ECU monitor input units 11) is stored.

Each of the first down counter 64 to the third down counter 66 is a down counter composed of a dedicated IC and has a predetermined pulse (clock, interrupt pulse, etc.).
Each time is entered, the held value is decremented. Moreover, the count start value to be down-counted (hereinafter referred to as a down-count value) can be set to an arbitrary value by data loading using the preset function.

The level conversion I / F 54 is for turning on various operation switches of the operation unit 53 provided in the data logger 1.
/ OFF is detected, and the operation signal by ON / OFF is
It is converted to a signal level on the main bus 63. TMU
55 is provided in the temperature measuring unit 9 and measures the temperature by utilizing the thermoelectromotive force generated in the thermocouple. The measured temperature is put on the main bus 63 via the RS-232C I / F 56.

The head amplifier (HEADAMP) 57, the multiplexer (MPX) 58, and the A / D converter 59 constitute the analog input section 10 shown in FIG. The head amplifier 57 amplifies each of the six various analog inputs taken from the DC motor 102. Multiplexer 58
Periodically selects one of the six analog inputs amplified by the head amplifier 57 and outputs the selected input.
The A / D converter 59 A / D converts the analog value selected by the multiplexer 58 into a digital value having a predetermined number of bits. PIO interface (PIO I / F) 61
Is the expansion slot 11 of the personal computer 114.
40M between PIO board 60 set to 4a
The data stored in the B memory unit 5 is transferred. The above-mentioned main CPU, 50, main ROM, 51, main RAM, 52, clock IC, 4, 40 MB memory section 5, level conversion I / F, 54, IC card I / F, 7,
RS-232CI / F.8, RS-232CI / F.5
6, the A / D converter 59, the PIO I / F 61, the first down counter 64 to the third down counter 66 are connected to the main bus 63.

Next, the communication control section 41 will be described. The communication control unit 41 has a main function of receiving data indicating control contents of the five ECUs 104 to 108 provided in the electric vehicle 2 (hereinafter, referred to as control data). The communication CPU 70 is the ECU 104-1
Control of communication with 08 and the ECU 104-10
Write each control data sent from 8 to the DPRAM 73. Communication ROM 72 has a communication CPU
The control program used in 70 is stored. The communication RAM 71 loads the control program and temporarily stores control data during execution of the control program.

DPRAM 73 is a dual port RA
M, and write and read of control data to and from the dual port RAM at different timings.
Can be done in parallel. Monitor communication I / F ・ 74
Reference numerals 78 to 78 perform communication timing adjustment, data format conversion, signal level conversion, and the like during communication between the corresponding ECU and the data logger 1. Communication CPU 70, communication ROM 72, communication RAM 71,
The monitor communication I / Fs 74 to 78 are connected to the communication bus 79.

Next, the operation of the automobile data recording device having the above-mentioned configuration will be described. When the operator pushes the ignition key (IG1) of the electric vehicle 2, the SW input unit 12
Detects that the key is turned on and turns on the relay switch 14. When the relay switch 14 is turned on, the power voltage of 12 [V] is supplied from the sub-battery 110 to the regulator 13. Regulator 13
Generates a power supply voltage of 5 [V] from the supplied power supply voltage of 12 [V] and supplies it to each unit of the data logger 1. Further, when the relay switch 14 is turned on, the power supply voltage of 12 [V] from the sub-battery 110 causes the battery voltage ECU 107 and the battery temperature ECU 10.
8 is supplied.

When power is supplied, the main CPU 50
Operates according to the control program, and main ROM 5
Sampling table stored in the main RA
Expand to M52. When the power is supplied, the main CPU 50 also operates according to the control program, and the first down counter 64 to the third down counter 66 are operated.
Different down count values are set for each of the above. Here, as an example, the first down counter is for 200 ms down counting, and the down count value is “20 (= 200 ms / 10 ms)”. Similarly, the second down counter (for 1 min down count)
The down count value of "6000 (= 60,000 ms ÷
10 ms) ", and the down count value of the third down counter (for 5 min down count) is" 30000 (=
The value "10 ms" shown here is a time interval (hereinafter referred to as a reference sampling time) at which the main CPU 50 inputs an interrupt to each down counter. Each down counter decrements its holding value each time the main CPU 50 interrupts (every 10 ms). Therefore, for example, the holding value of the first down counter is decremented from "20" to "0". When it comes to 20
This means that 0 ms (= 10 ms × 20) has elapsed. Further, the first down counter 64 to the third down counter 66
Instead of, the value of the register of the main RAM 52 may be used as the count value.

Next, the operator uses the personal computer 113 to determine various operation settings for the data logger 1 and writes the operation settings in the IC card 111. Then, the operator removes the IC card 111 in which the operation settings are written from the IC card writer 112, and the IC card I / I provided in the data logger 1 is removed.
Insert into F7. When the operator operates an IC card read switch (not shown) provided on the operation unit 53 of the data logger 1, the main CPU 50 causes the main CPU 50 to
The operation settings in the C card 111 are set in the IC card I
Load to main RAM 52 via / F7.
At this time, if the amount of data relating to the operation setting is small, the data may be directly loaded into the register in the main CPU 50.

Further, in the above description, the main CPU
In the case of 50, when the power is turned on, the sampling table stored in the main ROM 51 is expanded in the main RAM 52, but in addition, the operator uses the personal computer 113 to update the contents of the sampling table at any time. However, the updated contents may be stored in the main RAM 52 via the IC card 111. Similarly, the down count value set in each down counter 64-66 is set by the operator using the personal computer 113, and the set content is set in each down counter 64-66 via the IC card 111. You may do it.

When the operator turns on the start switch of the operation unit 53 after reading the operation settings, the data logger 1 starts logging, and the temperature measuring unit 9, analog input unit 10, and ECU monitor input unit 11 In parallel, the data is taken in respectively. The operation will be described below individually.

TMU 55 provided in the temperature measuring unit 9
Measures the temperature of each part of the main battery 101 and stores the measured value in the internal memory (not shown) of the TMU 55. The TMU.55 transmits the measured value in the internal memory to the main bus 63 via the RS-232C I / F.56 in parallel with the storage of the measured value in the internal memory. The measured value is stored in the main RAM 52.

Six analog input terminals extending from the analog input section 10 take in output values of a predetermined sensor (ammeter, acceleration sensor, etc.) attached to the DC motor 102. The head amplifier 57 amplifies each of the six various analog inputs taken from the DC motor 102. The multiplexer 58 periodically and sequentially selects one input from the six analog inputs amplified by the head amplifier 57 and outputs it. The A / D converter 59 A / D converts the analog value selected by the multiplexer 58 into a digital value having a predetermined number of bits. The output value of the A / D converter 59 is output by the main CPU 50 to the main RAM 5
Stored in 2.

Various control data from the ECUs 104 to 108 are sent to the monitor communication I / F 7 connected to the ECU.
It is taken into the ECU monitor input unit 11 via 4-78. Communication CPU 70 is monitor communication I / F 7
The control data read via 4 to 78 is stored in the communication RAM 71 at a constant very short cycle (for example, several tens ms cycle). Therefore, communication RAM
The old control data stored in 71 is updated to the latest control data one after another. Main CPU 50
Sends a write command to the DPRAM 73 to the communication CPU 70, and after the writing is completed, the DPRAM 7
Various control data stored in 3 is stored in main RAM
・ Read to 52.

As described above, the respective data obtained by the temperature measuring unit 9, the analog input unit 10, and the ECU monitor input unit 11 are read out to the main RAM 52 via the main bus 63. The time interval for reading (that is, the sampling time) is determined by the following method using a sampling table. First,
The main CPU 50 has three down counters (first down counter 64 to third down counter 6) for each preset reference sampling time (for example, 10 ms).
Insert interrupt for 6). Each of the three down counters decrements their own holding value (count value) by 1 each time an interrupt due to the reference sampling time is input. For example, the first counter 64
(For 200ms down count), the value held by the first interruption is "20 (= 200/1)
0) ”is reduced to“ 19 ”, and the next interrupt causes the held value“ 19 ”to be reduced to“ 18 ”, and so on.

The other two down counters (for 1 min down count and for 5 min down count) differ only in the hold value at the start of the down count, and the hold value is decremented each time the interrupt occurs. Then, the held value of each down counter is "0".
Then, after notifying the main CPU 50 of the fact, the holding value is again reduced to a down count value (“20” for 200 ms down count, “6000” for 1 min down count, and 5 min for 5 min down count). "30000") and start the next down count.

When any one of the three down counters (first down counter 64 to third down counter 66) receives a notification that the held value is "0", the main CPU 50 confirms from which down counter the notification was supplied. As a result, the main CPU 50 recognizes the sampling time counted by the down counter. When the sampling time is recognized, the main CPU 50 refers to the sampling table in the main RAM 52 to acquire the type of data (measurement unit and its channel number) set to be recorded at each sampling time. To do. Then, the main CPU 50 transfers the data obtained from the channel number of the measuring unit to the main RAM
It stores in 52.

As a concrete example, the held value of the first down counter 64 (for 200 ms down count) is "
When it becomes "0", the first down counter 64 notifies the main CPU 50 of that fact.
Confirms that the notification comes from the first down counter 64, recognizes the sampling time (200 ms) counted by the counter. As a method of recognizing the sampling time, when the down count value is set in each down counter when the power is turned on, the sampling time corresponding to each down counter may be recorded in the main RAM 52. In addition, the main CPU 50 calculates the sampling time by multiplying the down count value of the down counter (for example, "20" for 200 ms down count) by the reference sampling time (10 ms in this example). You may do it. The main CPU 50 refers to the sampling table in the main RAM 52 to set the type of data set to sample every 200 ms (for example, data obtained from channels 1 to 6 of TMU 55). And confirm the data,
By the method described above, the data is stored in the main RAM 52 via the main bus 63.

The main CPU 50 is the main CPU
Various data stored in AM ・ 52 (temperature measured value by TMU ・ 55, various analog measured value by A / D conversion,
Various control data by each ECU 104-108)
The data is stored in the 40 MB memory unit 5 after being expanded / arranged into a predetermined format. When storing data in the 40 MB memory unit 5, the main CPU 50 also adds a flag (hereinafter, referred to as a sampling time flag) indicating at what sampling time the data was obtained. To do.

The above-mentioned logging is continued until the operator turns on the stop switch of the operation unit 53.
Since the 40 MB memory unit 5 is backed up by the battery (BATT) 6, even if the power of the data logger 1 is turned off after the end of logging, various data in the 40 MB memory unit 5 is retained as it is. .

Next, when the operator operates the keyboard of the personal computer 114 to instruct to download the data, the data held in the 40 MB memory unit 5 is stored in the PIO I / F 6 provided in the data logger 1.
1 and is read to the personal computer 114 side via the PIO board 60 set in the expansion slot 114a of the personal computer 114. At this time, the above-mentioned data, which was binary data in the 40 MB memory unit 5, may be converted in data form and format such as being converted into ASCII data in the personal computer 114.
Further, at this time, the personal computer 114 classifies each data by sampling time by referring to the sampling time flag attached to the head of each data and stores it in a predetermined file. This is the end of the description of the operation of the data logger 1.

Next, the correspondence between the claimed invention and this embodiment will be described. Storage means ...... Main RAM ・ 52 Timekeeping means ・ ・ ・ Clock IC ・ 4 Down counter ...... First down counter 64 to third down counter 66 Loading means ...... Main CPU50, 40 MB Memory section 5 Sorting means ...... Personal computer 114 Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. However, it is included in this invention.

[0038]

As described above, according to the present invention, it is possible to share the timing means for generating the reference timing with respect to each data, so that the cost of the entire apparatus can be kept low. Further, since the correspondence between the sampling timing and the data can be centrally managed by using the storage means, it is difficult to make an operation error at the time of sampling. Further, since each data is classified for each sampling time based on the added identification data, it is easy to analyze the recorded data.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a data recording device of an automobile that executes a data sampling method according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of a control circuit and its peripheral circuit according to the same embodiment.

[Explanation of symbols]

1 ... Data logger, 2 ... Electric vehicle, 3 ... Control circuit, 4 ... Clock IC, 5 ... 40MB memory section, 6 ... Battery (BATT), 7 ... IC card I / F, 8 ... ... RS-232C I / F, 9 ... Temperature measuring part, 10 ... Analog input part, 11 ... ECU monitor input part, 12 ... SW input part, 13 ... Regulator (REG), 14 ... Relay switch

Claims (4)

[Claims] 1. A data sampling method for sampling a plurality of kinds of data at any of N kinds (N is an integer of 2 or more) of different time intervals, wherein before the start of sampling, the N kinds of time intervals and Correspondence with the type of data to be sampled at time intervals is stored in the storage means, and when sampling is started, a value obtained by dividing each of the N types of time intervals by a predetermined reference time interval, Each of the down counters is held in association with a different down counter, and the timing means supplies a reference signal to each of the down counters at the same timing at each of the reference time intervals, and each down counter receives each of the reference signals, Each held value is decreased by a predetermined value to count down, and the held value of each down counter has become less than or equal to a predetermined value. The down-counter sends the data fetching instruction to the sampling means, and then returns the held value to the value before the start of the down-counting again. When the fetching means receives the data fetching instruction from any of the down counters, the down-counter A data sampling method characterized in that the type of data to be sampled is read from the storage means at a time interval corresponding to a counter, and the data is fetched. 2. The data sampling method according to claim 1, wherein the fetching means adds identification data indicating a time interval at which the data is fetched to the fetched data, and after the sampling, the added data is added. A data sampling method, characterized in that each data is classified based on identification data for each time interval. 3. A data sampling apparatus for sampling a plurality of types of data at any of N types (N is an integer of 2 or more) of different time intervals, wherein the N types of time intervals and each time interval are sampled. Storage means for storing the correspondence with the type of data to be stored, timing means for outputting a reference signal at predetermined reference time intervals, and division of each of the N types of time intervals by the reference time interval One of the values that is different from each other
After holding two divided values, each time the reference signal is received from the time measuring means, the held value is reduced by a predetermined value to down-count, and when the held value becomes equal to or less than a predetermined value, data is stored. After sending the fetching instruction, the N down counters that return the held value to the value before the start of the down counting again, and when the data fetching instruction is received from any of the down counters, the time interval corresponding to the down counter is set. A data sampling device for reading the type of data to be sampled from the storage device and capturing the data. 4. The data sampling apparatus according to claim 3, wherein the capturing means adds identification data indicating a time interval of capturing the data to the captured data, and the added data is added after the sampling is completed. A data sampling apparatus comprising a classifying unit that classifies each data based on the identification data at each time interval.