CN107451032B - Data storage method of high-voltage frequency converter data acquisition system based on controller local area network interface card - Google Patents
Data storage method of high-voltage frequency converter data acquisition system based on controller local area network interface card Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3003—Monitoring arrangements specially adapted to the computing system or computing system component being monitored
- G06F11/3027—Monitoring arrangements specially adapted to the computing system or computing system component being monitored where the computing system component is a bus
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F8/30—Creation or generation of source code
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
Abstract
The invention relates to a data storage method of a high-voltage frequency converter data acquisition system based on a controller local area network interface card. The data comes from a CAN bus of a control panel of the high-voltage frequency converter, and the computer acquires data such as voltage, current and the like into the memory at the USB port through the conversion processing of the USBCAN-I type intelligent dual-channel CAN interface card. And (3) storing the received data while displaying the curve in real time by using a waveform chart control in LabView. The method improves the operation speed of the LabView program, and the data is complete and reliable. Due to the adoption of a caching strategy, the function of recording and not losing data information after an emergency comes is realized, and the function has the functions of an oscilloscope and a wave recorder.
Description
Technical Field
The invention relates to a data storage method of a high-voltage frequency converter data acquisition system based on a controller local area network interface card.
Background
The high-voltage frequency converter is the main equipment for dragging the motor to operate at present. The structure and the control algorithm are very complex, and researchers often need to collect various control quantities such as voltage, current, temperature, switching signals and the like and intermediate operation results. And transmitting the control quantities to an upper computer in a serial port communication mode for analysis and calculation. Generally speaking, the processing speed of a main controller of the high-voltage frequency converter is very high, the speed of serial port communication is low, the change of electric quantity cannot be transmitted in time, and the high-voltage frequency converter is only suitable for displaying the on-off state quantity. Because the sending and receiving data are not processed by a special chip, the serial port communication is easy to make mistakes and the reliability is low. The data collected by the upper computer is generally programmed by using windows programming software, a program interface needs to be designed by using high-level languages such as C language and the like, and the method is complex and needs to be mastered by research personnel very proficiently.
The eCAN (enhanced controller area network) bus module of a TMS320F2812 digital signal processor of a high-voltage frequency converter control board is used as a slave to send data to a computer. The computer runs a communication program written by LabView (Chinese meaning: experiment visual) software as a host computer to send commands and receive transmitted data. Generally, the received data is directly connected with a waveform chart in LabView, and then the waveform chart can be displayed and recorded.
Disclosure of Invention
The invention aims to provide a data storage method of a high-voltage frequency converter data acquisition system based on a controller local area network interface card, which is very simple and efficient in developing a monitoring program, complete in interface function and easy to operate. The technical scheme of the invention is as follows:
the data storage method of the high-voltage frequency converter data acquisition system based on the controller local area network interface card is characterized in that: the data storage method comprises the following steps of collecting data of a high-voltage frequency converter by utilizing a controller area network (CAN for short in English), wherein an instrument which is responsible for collecting and analyzing the data on the CAN bus and converting the data to a USB port of a computer is an intelligent dual-channel CAN interface card:
1) temporarily storing the collected data in any 'numerical value variable', and inserting the data into an array by using a 'replacement array subset';
"numerical variable": a data storage space created by LabVIEW software;
"replace array subset": selecting a programming module in a function board/programming/array function of LabVIEW software, wherein the function is to change the value of an array element;
2) the number of times of using the 'replacement array subset' is reduced, and when the first 9 data to be acquired from the CAN bus are received, the data are stored in 'numerical value variables' and are not processed;
3) the 'value 16' is the sequence number of received data, if the data is received for the 0 th time, the data is stored in a temporary variable 'value 17', if the data is received for the 1 st time, the data is stored in a temporary variable 'value 18', and so on, when the data is received for the 9 th time, the data of the previous 9 times and the data of the current time are totally written into an array by using 'replacement array subset' at one time, and the 'value 26' is used for determining the position sequence number of the written array;
"value 16", "value 17", "value 18", "value 26": here the name of the numerical variable;
4) designing a buffer with 10000 points, counting the number 26 to 1000 at most, performing a shift operation on the array after 1000, moving the data of the last 9990 points forward by 10 bits, waiting for new 10 data to be inserted behind the data, and returning the number 26 to 999;
5) when "start recording", it is necessary to pre-process the lower buffer array, delete the last 10 repeats before inserting new data, or delete the unfilled zeros. After the recording is started, the method is executed once, the judgment is carried out by using a numerical value variable Boolean 2, and new data can be inserted after the array is deleted;
"start recording": a button of the program interface is clicked to start recording the acquired data;
"boolean 2": this numerical variable is of the Boolean (BOOL) type, i.e. only 0 and 1, with a sequence number of 2;
6) adopting a method of reducing the use of 'replacement array subset' in the step 2), reducing the use of 'array insertion', recording the data received for the previous 4 times into temporary variable numerical values 11-14, wherein the numerical value 10 is the sequence number of the received data, and when the 5 th data is used for temporarily inserting the numerical values 11-14 and the numerical value 5 into the array at the present time;
"array insertion": a programming module in a function selecting plate \ programming \ array function of LabVIEW software is used for inserting elements or subarrays into the positions designated by indexes in the n-dimensional array;
7) when "stop recording", the program enters "stop recording" of the event structure: value change, utilizing the formed array to create waveform, and inputting the waveform into a program module of writing waveform into file;
"stop recording": a button of the program interface stops data recording after clicking;
"stop recording: value change ": entering a processing program of the event when a 'stop record' button is pressed;
8) after the application program directory is obtained, naming the waveform file by referring to the date and time of the stop time, obtaining different file names at different times, and storing data obtained in each experiment in the application program directory after obtaining a file path;
9) and finally, preparing for starting new recording, reinitializing the array into an array with 10000 elements and all initial values of 0, and reducing the value 10 and the value 26 into the initial values so that the new recording program can run smoothly.
The running state of the program is divided into three parts, namely a first part: caching about 10000 points of data before starting recording; the second part is that: clicking a record starting button, and starting to record the cached point and the newly received point into an array; the third part is that: and stopping recording new data points, saving the array to the hard disk, and automatically naming the new file. The fourth part: and recording and reading, and opening a recording file.
The working principle is as follows:
the control board of the high-voltage frequency converter mainly has the function of driving the on and off of each IGBT (insulated gate bipolar transistor) of the main loop of the power unit according to a certain control algorithm according to the measured voltage and current, namely generating PWM (pulse width modulation) waves. The main loop program of the main control board DSP (digital signal processor) executes a main interrupt program every 1/2500 seconds with the help of a timer, and the main interrupt program sends values of internal variables and output variables of a control algorithm to an upper computer through an eCAN (enhanced controller area network) bus module while calculating the variables. The control board is physically connected with the computer through an intelligent dual-channel controller local area network interface card. The controller LAN interface card can accurately, reliably and quickly transmit data to the USB port of the computer, and the LabView program can introduce the received data into the program block diagram through the drive and the interface library function. At this time, a waveform curve can be displayed in real time by directly using a waveform chart graphic display control in LabView and setting the size of the buffer area. There is no very direct method in LabView to store these high-speed data.
The technical effects are as follows:
CAN-bus (controller Area network), a controller Area network, is a field bus. The invention is a serial communication protocol, as a remote network communication control mode with advanced technology, high reliability, perfect function and reasonable cost, which is widely applied to various automatic control systems. The intelligent controller LAN interface card is used as hardware transmission equipment, one end of the interface card is connected with a main control board of the high-voltage frequency converter through a double-core CAN bus cable, and the other end of the interface card is connected with a USB port of a computer PC through a USB cable. In the past, serial port communication is used, and a computer mainboard needs to be provided with a serial interface. LabView is a program development environment developed by the national instruments of America, uses a graphical editing language to compile a program, only needs to use various graphical modules to connect the various modules, generates a program in a block diagram form, and develops the interface function of measurement and control software by using the program, so that the interface function is complete and easy to understand. In the past, programs are written by using a computer text language, and the programs are complicated to program and are difficult to understand. The CAN bus communication CAN be started by installing a driver of the interface card on the computer and then importing the dynamic link library for calling the driver into the LabView program, so that the realization is very simple and convenient.
The data acquisition and storage method provided by the invention is proved to be very suitable for high-speed data acquisition of 2500 frames per second, and the data can be completely stored without frame loss, real-time display and trailing. Under the condition of being equipped with a sensor and a controller, the device can replace an oscilloscope to realize the functions of static display when the waveform is unchanged, and data is still not lost when the waveform is suddenly changed and is captured after 4 seconds of delay. In the prior art, when LabView is used for waveform display, what data is received is directly connected to a waveform diagram module for real-time display. When waveform data needs to be recorded, the recording is started by clicking in advance, and useless data for a long time is often stored. During the experiment of the research and development personnel, the waveform of a certain specific event generally needs to be recorded, if the waveform is recorded in advance, the storage space is wasted, and it is troublesome to look back at the desired time point. The data acquisition and storage method is realized by LabView programming, a small space is opened up in the memory as long as the program is started, data of a period of time is cached, and the duration can be set to be several seconds at will. The memory space is refreshed continuously to ensure that the latest continuous data is in the memory space. Once a specific event occurs, the waveform data is recorded by clicking again, and the waveforms cached after clicking and before clicking can be recorded together. The innovative function is very practical, and the work of research personnel is facilitated.
Drawings
FIG. 1 is a block diagram of a process for placing received data into temporary variables during caching
FIG. 2 is a block diagram of a process for completely writing sequentially received 10 times data into an array
FIG. 3 is a block diagram of a procedure for shifting 9990 points of data forward by 10 bits
FIG. 4 is a block diagram of a process for deleting 10 numbers of last repeats or deleting zero values
FIG. 5 is a block diagram of a process for placing received data into a temporary variable during recording
FIG. 6 is a block diagram of a process for inserting all of the sequentially received 5 times data into the tail end of an array
FIG. 7 is a block diagram of a process for creating a waveform and writing a file after recording is stopped
FIG. 8 is a block diagram of a process for reinitializing an array in preparation for a new record after stopping the record
FIG. 9 is a block diagram of a process for opening a viewing log file
Detailed Description
A data storage method of a high-voltage frequency converter data acquisition system based on a controller local area network interface card is characterized in that: the data storage method comprises the following steps of collecting data of a high-voltage frequency converter by utilizing a controller area network (CAN for short in English), wherein an instrument which is responsible for collecting and analyzing the data on the CAN bus and converting the data to a USB port of a computer is an intelligent dual-channel CAN interface card: 1) temporarily storing the collected data in any 'numerical value variable', and inserting the data into an array by using a 'replacement array subset';
"numerical variable": a data storage space created by LabVIEW software;
"replace array subset": selecting a programming module in a function board/programming/array function of LabVIEW software, wherein the function is to change the value of an array element;
2) the number of times of using the 'replacement array subset' is reduced, and when the first 9 data to be acquired from the CAN bus are received, the data are stored in 'numerical value variables' and are not processed;
3) the 'value 16' is the sequence number of received data, if the data is received for the 0 th time, the data is stored in a temporary variable 'value 17', if the data is received for the 1 st time, the data is stored in a temporary variable 'value 18', and so on, when the data is received for the 9 th time, the data of the previous 9 times and the data of the current time are totally written into an array by using 'replacement array subset' at one time, and the 'value 26' is used for determining the position sequence number of the written array;
"value 16", "value 17", "value 18", "value 26": here the name of the numerical variable;
4) designing a buffer with 10000 points, counting the number 26 to 1000 at most, performing a shift operation on the array after 1000, moving the data of the last 9990 points forward by 10 bits, waiting for new 10 data to be inserted behind the data, and returning the number 26 to 999;
5) when "start recording", it is necessary to pre-process the lower buffer array, delete the last 10 repeats before inserting new data, or delete the unfilled zeros. After the recording is started, the method is executed once, the judgment is carried out by using a numerical value variable Boolean 2, and new data can be inserted after the array is deleted;
"start recording": a button of the program interface is clicked to start recording the acquired data;
"boolean 2": this numerical variable is of the Boolean (BOOL) type, i.e. only 0 and 1, with a sequence number of 2;
6) adopting a method of reducing the use of 'replacement array subset' in the step 2), reducing the use of 'array insertion', recording the data received for the previous 4 times into temporary variable numerical values 11-14, wherein the numerical value 10 is the sequence number of the received data, and when the 5 th data is used for temporarily inserting the numerical values 11-14 and the numerical value 5 into the array at the present time;
"array insertion": a programming module in a function selecting plate \ programming \ array function of LabVIEW software is used for inserting elements or subarrays into the positions designated by indexes in the n-dimensional array;
7) when "stop recording", the program enters "stop recording" of the event structure: value change, utilizing the formed array to create waveform, and inputting the waveform into a program module of writing waveform into file;
"stop recording": a button of the program interface stops data recording after clicking;
"stop recording: value change ": entering a processing program of the event when a 'stop record' button is pressed;
8) after the application program directory is obtained, naming the waveform file by referring to the date and time of the stop time, obtaining different file names at different times, and storing data obtained in each experiment in the application program directory after obtaining a file path;
9) and finally, preparing for starting new recording, reinitializing the array into an array with 10000 elements and all initial values of 0, and reducing the value 10 and the value 26 into the initial values so that the new recording program can run smoothly.
The invention will now be described in more detail with reference to the accompanying figures 1 to 9:
the first part is:
for the reason of a sender, the upper computer receives one frame of data every 1/2500 seconds, the rate is within the range of 3000 frames/second of the highest data flow when the CAN interface card works in a single channel, and the time for processing the data by LabView is not sufficient and is only 1/2500 seconds. These times are sufficient to temporarily store the data in some temporary variable, but the complex program module of "replace array subset" is used to insert the data into the array, and the actual test takes more time, which results in the delay of receiving the next frame data and the slow refresh rate of the whole real-time display. However, the data that LabView has no time to display is not lost, and it is saved in memory and shifted out sequentially. Aiming at the problem, the following design is made: the number of times of using the "replacement array subset" is reduced, and the first 9 data are received and stored in some temporary variable without processing, as shown in fig. 1. The value 16 is the sequence number of the received data, and if the data is received 0, the data is stored in a temporary variable value 17, if the data is received 1, the data is stored in a temporary variable value 18, and so on. When data is received for the 9 th time, the data of the previous 9 times and the total 10 data of the data of this time are all written into the array at one time by using the 'replacement array subset', and the position sequence number of the written array is determined by using a numerical value 26, as shown in fig. 2. Since the design only caches 10000 points, the number 26 counts to 1000 at most, a shift operation is performed on the array after 1000, the data at the last 9990 points is moved forward by 10 bits, a new 10 data insertion is waited for, and the number 26 returns to 999, as shown in fig. 3. At this time, the data of 10000 dots is refreshed in the left shift operation as long as the recording is not started.
The second part is that:
when recording is started, the next buffer array needs to be processed in advance, and because the 10 last to last buffer points and the 10 last to last buffer points are repeated when the buffer is full, and the part which is not full is all zero when the buffer is not full, the last repeated 10 numbers are deleted or the zero value which is not full is deleted before new data is inserted, as shown in fig. 4. This operation is performed only once after the start of recording, and is judged by boolean 2. After the deletion, new data can be inserted after the array, and since the "array insertion" program module of LabView still takes a lot of time, the method of reducing the use of "replacement array subset" described above is still used, the "array insertion" is reduced, and the data received in the previous 4 times are recorded into the temporary variable values 11 to 14, as shown in fig. 5, the value 10 is the sequence number of the received data. When the 5 th data is used, the values 11 to 14 are temporarily inserted into the array together with the present value 5, as shown in fig. 6.
The third part is that:
when the stop record is clicked, the program enters "stop record" of the event structure: value change ". The waveform is created using the previously formed array and input to the "write waveform to file" program module. After acquiring the application directory, the waveform file is named with reference to the date and time (accurate to seconds) of the stop time, and different file names are not given at the same time. After the file path is obtained, the data obtained by each experiment can be stored in an application program directory. As shown in fig. 7. And finally, preparing for starting new recording, reinitializing the array into an array with 10000 elements and all initial values of 0, and reducing the value 10 and the value 26 into the initial values so that the new recording program can run smoothly. As shown in fig. 8.
The fourth part:
the page is switched to record reading using a tab control. The data curve is displayed on the waveform diagram when the path is selected and then the "open record file" button is clicked. The specific procedure is shown in FIG. 9. The curve can automatically adjust the scaling according to the amplitude, and a user can arbitrarily enlarge and reduce local and global data to be checked according to needs, drag the image left and right, check curves at different times, and obtain a specific X value and a specific Y value by using a cursor function.
Claims (1)
1. A data storage method of a high-voltage frequency converter data acquisition system based on a controller local area network interface card is characterized in that: the data storage method comprises the following steps of utilizing a Controller Area Network (CAN) bus for English short to acquire data of the high-voltage frequency converter, wherein an instrument responsible for acquiring, analyzing and converting the data on the CAN bus to a USB port of a computer is an intelligent dual-channel CAN interface card:
1) temporarily storing the collected data in any 'numerical value variable', and inserting the data into an array by using a 'replacement array subset';
"numerical variable": a data storage space created by LabVIEW software;
"replace array subset": selecting a programming module in a function board/programming/array function of LabVIEW software, wherein the function is to change the value of an array element;
2) the number of times of using the 'replacement array subset' is reduced, and when the first 9 data to be acquired from the CAN bus are received, the data are stored in 'numerical value variables' and are not processed;
3) the 'value 16' is the sequence number of received data, if the data is received for the 0 th time, the data is stored in a temporary variable 'value 17', if the data is received for the 1 st time, the data is stored in a temporary variable 'value 18', and so on, when the data is received for the 9 th time, the data of the previous 9 times and the data of the current time are totally written into an array by using 'replacement array subset' at one time, and the 'value 26' is used for determining the position sequence number of the written array;
"value 16", "value 17", "value 18", "value 26": here the name of the numerical variable;
4) designing a buffer with 10000 points, counting the number 26 to 1000 at most, performing a shift operation on the array after 1000, moving the data of the last 9990 points forward by 10 bits, waiting for new 10 data to be inserted behind the data, and returning the number 26 to 999;
5) when the 'record start' is carried out, the lower cache array needs to be processed in advance, the last repeated 10 numbers are deleted before the new data is inserted, or the unfilled zero values are deleted, the 'record start' is only executed once, the judgment is carried out by using a numerical value variable 'Boolean 2', and the new data can be inserted after the array is deleted;
"start recording": a button of the program interface is clicked to start recording the acquired data;
"boolean 2": the numerical variable is of a Boolean BOOL type, namely only 0 and 1, and the serial number is 2;
6) adopting a method of reducing the use of 'replacement array subset' in the step 2), reducing the use of 'array insertion', recording the data received for the previous 4 times into temporary variable numerical values 11-14, wherein the numerical value 10 is the sequence number of the received data, and when the 5 th data is used for temporarily inserting the numerical values 11-14 and the numerical value 5 into the array at the present time;
"array insertion": a programming module in a function selecting plate \ programming \ array function of LabVIEW software is used for inserting elements or subarrays into the positions designated by indexes in the n-dimensional array;
7) when "stop recording", the program enters "stop recording" of the event structure: value change, utilizing the formed array to create waveform, and inputting the waveform into a program module of writing waveform into file;
"stop recording": a button of the program interface stops data recording after clicking; "stop recording: value change ": entering a processing program of the event when a 'stop record' button is pressed;
8) after the application program directory is obtained, naming the waveform file by referring to the date and time of the stop time, obtaining different file names at different times, and storing data obtained in each experiment in the application program directory after obtaining a file path;
9) and finally, preparing for starting new recording, reinitializing the array into an array with 10000 elements and all initial values of 0, and reducing the value 10 and the value 26 into the initial values so that the new recording program can run smoothly.
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