CN111337259B - Engine continuous data acquisition and display method - Google Patents
Engine continuous data acquisition and display method Download PDFInfo
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- CN111337259B CN111337259B CN202010176373.XA CN202010176373A CN111337259B CN 111337259 B CN111337259 B CN 111337259B CN 202010176373 A CN202010176373 A CN 202010176373A CN 111337259 B CN111337259 B CN 111337259B
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- G01M15/00—Testing of engines
Abstract
The invention relates to a method for continuously acquiring and displaying data of an engine, which develops a method for connecting a digital oscilloscope and an oscilloscope, controlling the oscilloscope to acquire, transmit and monitor in real time by utilizing the characteristics that the digital oscilloscope can be communicated with the MATLAB and the acquired data can be derived.
Description
Technical Field
The invention belongs to the field of engine testing, and particularly relates to a method for acquiring and displaying continuous data of an engine.
Background
Signal acquisition is becoming more and more important work in the automatically controlled engine control system research and development process, and digital oscilloscope is receiving the favor of engine test personnel more and more with its advantages such as convenient to carry, simple to use, measurement accuracy.
In order to analyze each signal, a test such as engine durability requires a long-time high-speed acquisition. In an electric control engine test, the number of the acquisition channels is large, and signal names corresponding to the channels are easy to be confused when data are stored; the oscilloscope is generally in a transmission mode that the oscilloscope firstly stores acquired data into a buffer area of the oscilloscope and transmits the acquired data to the PC after the acquisition is finished; because the capacity of the buffer memory of the oscilloscope is limited, when long-time continuous acquisition is needed, the buffer memory of the oscilloscope is far from enough.
In the existing method, for example, an engine data acquisition method and device disclosed in chinese patent CN108871782A, the judgment of storing or not storing the received engine data is realized by setting the acquisition period, and the flexibility of data acquisition is improved; there is also a paper "development of portable multi-channel fast plug-in type engine parameter acquisition system," power for modern vehicles ", 2 nd phase, total 162 th phase, 2016 year 5 month", developed a portable acquisition system, collect and record the analog signal of various sensors on the engine, but this acquisition system stores the data in the data collector, is not suitable for the long-time high-speed acquisition; the above mentioned methods are all to collect and convert signals by developing a data collecting device, but they cannot realize high-speed and continuous collection of signals, and further cannot realize real-time display of signals and storage of collected engine signal names.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to establish a method for continuously acquiring and displaying data of an engine, directly controlling the acquisition and the data display of a digital oscilloscope by combining an MATLAB software development program with the operation of a user on a GUI (graphical user interface), automatically storing the data and signal names after the acquisition is finished, having high transmission speed and being capable of realizing the continuous high-speed acquisition of the data of the engine.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for continuously acquiring and displaying data of an engine is characterized in that MATLAB software is connected with a digital oscilloscope, the acquisition and the data display of the digital oscilloscope are directly controlled by combining the operation of a user on a GUI (graphical user interface), and the data and signal names are automatically stored after the acquisition is finished, and the method specifically comprises the following steps:
firstly, a user opens a GUI interface, selects a signal name acquired by a channel in pull-down menus of the channels, and selects an 'open' option if the signal name is not found; selecting the model of the oscilloscope, and filling in sampling interval time;
then, selecting manual collection stopping or quantitative automatic collection stopping according to collection requirements, clicking a collection starting button, and then executing a GUI interface development program; the process of the GUI interface development program comprises the following steps: acquiring parameter values filled in by a user of a current GUI; calculating the opening number of the channels of the oscilloscope; clearing the last run-time image display; running an oscilloscope acquisition program; storing the acquisition result as MAT data; circularly judging whether the signal name of each channel is determined, recording the signal name and creating a signal name vector; storing the signal name vector and the collected data array;
wherein the flow of the oscilloscope acquisition program comprises: initializing parameters, and operating a drive file to connect with an oscilloscope; setting the range of the oscilloscope, an internal buffer area, a sampling mode, a sampling interval and the number of sampling points; judging whether the quantitative acquisition mark is started, if so, setting the number of the acquisition sampling points as the maximum sampling number, and automatically stopping marking 1 when the number is exceeded; judging whether the acquisition stopping key is pressed down, and setting a key stopping mark to be 1 if the acquisition stopping key is pressed down; judging the number of named channels and setting graphic display areas; collecting data in while circulation, displaying and detecting stop marks; when the while circulation condition is not met, jumping out of circulation to execute a program of disconnecting the oscilloscope, and ending the acquisition program of the oscilloscope;
finally, when the user clicks 'save as MAT', all channel data are saved in an MAT format, including channels which are not opened, and the first column is sampling time; when 'save as Excel' is clicked, the program can export the opened channel, the channel head line of which the signal name is selected displays the corresponding signal name, and the channel head line of 'open' is selected to display the channel name.
Further, the data acquisition, display and detection stop mark in the while loop in the oscilloscope acquisition program specifically includes the following aspects:
firstly, storing acquired data in a buffer area, and creating a time vector of the current acquired data;
drawing the signals with the determined names into graphs, displaying the graphs on a GUI graph display window, and adopting the current time vector on the abscissa;
thirdly, storing the data of the buffer area into an MATLAB array, then emptying the buffer area and preparing to acquire the next cycle;
and fourthly, judging whether the collection stopping key is pressed down and whether the maximum sampling number is exceeded, and if so, setting a key stopping mark to be 1 or setting an automatic stopping mark to be 1.
Further, when the user clicks a 'save as Excel' button, executing a save Excel program, firstly saving a save directory selected by the current user, facilitating next storage and opening a progress bar; calculating the length of the whole acquired data; calculating an Excel storage area; judging the calculated total page number, and filling the acquired data and the signal name into Excel; and after the preservation is finished, closing the progress bar.
Further, calculating the Excel storage area comprises the following aspects: judging whether the data length and the 10^6 remainder are 0 or not; if the remainder is 0, then the total number of pages is equal to the quotient of the length and 10^6, and if the remainder is not 0, then the total number of pages is equal to the quotient of the length and remainder difference and 10^6 plus 1.
Further, the step of judging the calculated total number of pages and filling the acquired data and signal names into Excel specifically comprises the following steps: when the total page number is 1, only one page is needed, the signal name is filled into the line A1, and the collected data is filled below the line A2; and when the total page number is not 1, circularly filling each page with the signal name in the first row and filling the collected data in the other rows in sequence.
Has the advantages that: the invention realizes the communication between the digital oscilloscope and MATLAB software by developing an MATLAB program, controls the oscilloscope to collect and send the collected data to the MATLAB, realizes the functions of quantitative collection, real-time display, automatic signal name storage and the like, has high transmission speed by controlling the digital oscilloscope to collect, and transmits the data to the PC in real time to realize long-time collection, and has the following advantages compared with the prior art:
1. the invention develops a continuous acquisition program of the digital oscilloscope, transmits the acquisition data of the oscilloscope to the MATLAB in real time, is not limited by the capacity of a cache region of the oscilloscope, and is convenient for long-time high-speed acquisition in a test.
2. The automatic stop function of manual and quantitative is provided; on a GUI (graphical user interface), the function of manual stop or quantitative automatic stop can be realized through selection, so that the data acquisition is more flexible.
3. The device has the function of displaying the collected data in real time; and according to the number of channels which are selected and opened and named by a user, the windows are distributed evenly, and the coordinate axes move along with time, so that the data can be observed in real time conveniently.
4. The function of data storage and automatic signal name storage is provided; the signal names commonly used by the engine have been added to the pull-down menu, and the signal names are automatically saved in the top row when the saved data is Excel, and the channel names are automatically saved in the top row when the signal names are not selected.
Drawings
FIG. 1 is a flowchart of the operation of a GUI interface development program;
FIG. 2 is a flowchart of an oscilloscope acquisition procedure;
FIG. 3 is a flowchart of a data save Excel process;
FIG. 4 is a GUI user interaction platform.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The invention develops a method for connecting MATLAB and oscilloscope and controlling the oscilloscope to carry out acquisition, transmission and real-time monitoring by means of the characteristics that the MATLAB can be communicated with the oscilloscope and the acquired data can be exported, a platform can acquire the signal name and the acquisition mode filled and selected by a user by developing a GUI user interaction interface, the digital oscilloscope can be communicated, set, acquired, stored and disconnected by the MATLAB, the acquired signal is displayed in real time by a background program, the acquired data and the signal name are automatically stored after the acquisition is finished, and the functions of quantitative acquisition, real-time display, automatic signal name storage and the like are realized.
The background program of the invention can be divided into an oscilloscope acquisition program and a GUI interface development program which are respectively and specifically introduced below.
As shown in fig. 1, the GUI interface development program has the following steps:
step one, acquiring a parameter value filled in by a current GUI interface user;
step two, calculating the opening number of the channels of the oscilloscope;
clearing image display in the last run;
operating the oscilloscope acquisition program;
step five, storing the acquisition result as MAT data;
step six, circularly judging whether the signal name of each channel is determined, recording the signal name and creating a signal name vector;
and seventhly, storing the signal name vector and the collected data array.
As shown in fig. 2, the oscilloscope acquisition procedure comprises the following steps:
initializing parameters, and running a drive file to connect with an oscilloscope;
step two, relevant parameters of the oscilloscope are set, and the method comprises the following aspects:
1. setting the range and the internal buffer area. The amplitude of the signals commonly used on the engine is below 20V, so for simplification, the range is set to +/-2000 mV after the range is attenuated by 10 times in the program. The internal buffer area is a medium for acquiring and storing data by the oscilloscope, 250000 sampling point numbers are set by a program, the type of each sampling point data is int16, and the data is cleared and stored again after the data is stored to reach the number.
2. The sampling mode is set to a streaming mode. This is the digital oscilloscope sampling mode type selection, and the stream mode is the continuous acquisition mode.
3. Setting sampling intervals and the number of sampling points. And acquiring parameter values filled in by a user through a GUI (graphical user interface) and giving the parameter values to oscilloscope driving statements.
Step three, judging whether the quantitative acquisition mark is started, if so, setting the number of the acquisition sampling points as the maximum sampling number, and automatically stopping marking 1 when the number is exceeded;
step four, judging whether the acquisition stopping key is pressed down, and setting a key stopping mark to be 1 if the acquisition stopping key is pressed down;
judging the number of named channels and setting graphic display areas;
step six, collecting data, displaying and detecting a stop sign in while circulation, comprising the following aspects:
1. the collected data is stored in a buffer area, and a time vector of the current collected data is created.
2. And drawing the signals with the determined names into graphs, displaying the graphs on a GUI graph display window, and adopting the current time vector on the abscissa.
3. And storing the data of the buffer area into an MATLAB array, and then emptying the buffer area to prepare for collecting the next cycle.
4. And judging whether the collection stopping key is pressed down and whether the maximum sampling number is exceeded, and if so, setting a key stopping mark to be 1 or setting an automatic stopping mark to be 1.
And step seven, when the while circulation condition is not met, jumping out of the circulation to execute the oscilloscope disconnection program, and ending the oscilloscope acquisition program.
As shown in fig. 3, the data save Excel program contains the following steps:
step one, saving a saving directory selected by a current user, facilitating the next storage and opening a progress bar;
step two, calculating the length of the whole acquired data;
and step three, calculating an Excel storage area. Since some Excel versions can only store 10^6 lines per page, if exceeding, the files need to be stored in other Sheet pages, so the storage area needs to be calculated. Comprises the following aspects:
1. judging whether the data length and the 10^6 remainder are 0 or not, if so, judging that the total page number is equal to the quotient of the length and the 10^ 6;
2. if the remainder is not 0, then the total number of pages equals the length and remainder difference multiplied by 1 by the quotient of 10^ 6.
Step four, judging the calculated total page number, and filling the acquired data and signal names into Excel, wherein the method comprises the following contents:
1. when the total page number is 1, only one page is needed, the signal name is filled into the line A1, and the collected data is filled below the line A2;
2. and when the total page number is not 1, circularly filling each page with the signal name in the first row and filling the collected data in the other rows in sequence.
And step five, closing the progress bar after the storage is finished.
The GUI user interface is a GUI user interaction platform integrating parameter setting, engine signal name selection, acquisition mode selection, result display and data export, wherein the result display is provided with a table display window and a graphic display window, the graphic display can realize real-time display of acquired data, and the abscissa is a real-time variable time axis, as shown in FIG. 4.
The invention can realize the communication between the digital oscilloscope and the MATLAB software by developing a digital oscilloscope driver and developing an MATLAB/GUI executive program, control the oscilloscope to acquire and send to the MATLAB, and realize the functions of quantitative acquisition, real-time display, automatic signal name storage and the like.
Quantitative collection function: a stop button is added in the program, collection is stopped after the stop button is pressed down, and a collected result is stored and displayed in a GUI table display window.
And an automatic stopping function, wherein the program automatically stops after the collection reaches the set number by setting the number of the collected sampling points in the GUI, and the collected result is stored and then displayed in a GUI table display window.
The image real-time display function is realized, the judgment of the opening number of the channels and the judgment of whether the signal names acquired by the channels are determined are added in a program, and the space of a graphic display window is reasonably distributed; for the channel of which the user selects the signal name in the interface, all the channels are displayed in the graph in real time, and the windows are distributed evenly; when the collected signals do not find the corresponding names in the pull-down menu, the user selects to turn on, the program is only displayed in the table display window and stores the export result, and the export result cannot be displayed in the graphic window in real time so as to save space; in addition, the coordinate axis in the graphic display program is moved along with the time, so that the collected data can be observed conveniently in real time.
Data and signal name saving function: when the user clicks "save as MAT", the program will save all channel data in MAT format, including channels that are not open, with the first column being sampling time. When 'save as Excel' is clicked, the program can export the opened channel, the channel head line of which the signal name is selected displays the corresponding signal name, and the channel head line of 'open' is selected to display the channel name. The channel thus selected "closed" will not be displayed in Excel, so that the Excel table size is reduced and the export speed is increased.
Example 1
After the user opens the GUI interface, the signal name collected by the channel is selected in each channel pull-down menu, and if the signal name is not found, an 'opening' option is selected. The oscilloscope model is selected and the sampling interval time is filled in.
Selecting manual collection stopping or quantitative automatic collection stopping according to collection requirements; when the player stops moving, the 'automatic stop function' frame is not checked, the 'number of sampling points' frame is in a gray frozen state, the program will fill in the default value but will not assign the maximum number of sampling points, and at the moment, the 'start collection' button is clicked, and the GUI running program is executed; when the 'automatic stop function' box is selected, the 'number of collected sampling points' box is activated, the user needs to fill the number of collected sampling points, then clicks a start collection button, and then executes a GUI running program.
As shown in fig. 1, the GUI interface program first obtains the parameter value filled by the user of the current GUI interface; calculating the opening number of the channels of the oscilloscope; clearing the last run-time image display; running an oscilloscope acquisition program; storing the acquisition result as MAT data; circularly judging whether the signal name of each channel is determined, recording the signal name and creating a signal name vector; and saving the signal name vector and the collected data array.
The flowchart of the oscilloscope acquisition program is shown in fig. 2, firstly initializing parameters, and operating a drive file to connect the oscilloscope; setting the range of the oscilloscope, an internal buffer area, a sampling mode, a sampling interval, the number of sampling points and the like; judging whether the quantitative acquisition mark is started, if so, setting the number of the acquisition sampling points as the maximum sampling number, and automatically stopping marking 1 when the number is exceeded; judging whether the acquisition stopping key is pressed down, and setting a key stopping mark to be 1 if the acquisition stopping key is pressed down; judging the number of named channels and setting graphic display areas; and acquiring data, drawing and detecting a stop mark in the while loop, and when the while loop condition is not met, jumping out of the loop to execute a program of disconnecting the oscilloscope, and ending the acquisition program of the oscilloscope.
When the 'save as Excel' button is clicked, executing an Excel save program, firstly saving a save directory selected by a current user as shown in fig. 3, facilitating next storage, and opening a progress bar; calculating the length of the whole acquired data; judging the total number of pages after calculation, and filling the acquired data and signal names into Excel; and after the preservation is finished, closing the progress bar.
As shown in fig. 4, which is an application example of the manual stop mode, A, B, E three channels are opened, wherein, the channel a and the channel B determine the signal name, the left graphic display window displays the collected image in real time, and the upper right table display window displays the collected data when the collection is finished; when clicking 'save as MAT', the program can save all channel data into an MAT format, including channels which are not opened, with the first column being sampling time; when clicking "save as Excel", the program will derive A, B, E channels, where the a and B channels display the corresponding signal names, the E channel displays the channel names, and automatically creates a multi-page Sheet according to the data length.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for continuously acquiring and displaying data of an engine is characterized in that MATLAB software is connected with a digital oscilloscope, the acquisition and data display of the digital oscilloscope are directly controlled by combining the operation of a user on a GUI (graphical user interface), the acquired data of the oscilloscope are transmitted to the MATLAB in real time, the data display is carried out according to the number of channels which are selected by the user to be opened and named, a window is averagely distributed, and a coordinate axis moves along with the time; after the acquisition is finished, the data and the signal names are automatically stored, and the method specifically comprises the following steps:
firstly, a user opens a GUI interface, selects a signal name acquired by a channel in pull-down menus of the channels, and selects an 'open' option if the signal name is not found; selecting the model of the oscilloscope, and filling in sampling interval time;
then, selecting manual collection stopping or quantitative automatic collection stopping according to collection requirements, clicking a collection starting button, and then executing a GUI interface development program; the process of the GUI interface development program comprises the following steps: acquiring parameter values filled in by a user of a current GUI; calculating the opening number of the channels of the oscilloscope; clearing the last run-time image display; running an oscilloscope acquisition program; storing the acquisition result as MAT data; circularly judging whether the signal name of each channel is determined, recording the signal name and creating a signal name vector; storing the signal name vector and the collected data array;
wherein the flow of the oscilloscope acquisition program comprises: (1) initializing parameters, and operating a drive file to connect with an oscilloscope; (2) the method for setting the relevant parameters of the oscilloscope specifically comprises the following steps: setting a measuring range and an internal buffer area, wherein the amplitude of a signal commonly used on an engine is below 20V, so for simplification, the measuring range is attenuated by 10 times in a program and then set to +/-2000 mV, the internal buffer area is a medium for acquiring and storing data by an oscilloscope, the program sets 250000 sampling points, the data type of each sampling point is int16, and the sampling points are cleared and stored again after the data type is up to the number; setting a sampling mode as a stream mode, wherein the stream mode is selected as the type of the sampling mode of the digital oscilloscope, and the stream mode is a continuous acquisition mode; setting a sampling interval and the number of sampling points, acquiring parameter values filled in by a user through a GUI (graphical user interface), and giving the parameter values to oscilloscope driving sentences; (3) judging whether the quantitative collection mark is started, if not, continuing the next step, if so, setting the number of the collected sampling points as the maximum sampling number, and when the number exceeds the maximum sampling number, automatically stopping marking 1, and continuing the next step; (4) judging whether the acquisition stopping key is pressed down, if not, continuing the next step, if so, setting a key stopping mark as 1, and then continuing the next step; (5) judging the number of named channels and setting graphic display areas; (6) the method comprises the following steps of collecting data in a while loop, displaying and detecting a stop mark, wherein the method specifically comprises the following steps: firstly, storing acquired data in a buffer area, and creating a time vector of the current acquired data; drawing the signals with the determined names into graphs, displaying the graphs on a GUI graph display window, and adopting the current time vector on the abscissa; thirdly, storing the data of the buffer area into an MATLAB array, then emptying the buffer area and preparing to acquire the next cycle; judging whether the acquisition stopping key is pressed down and whether the maximum sampling number is exceeded, if not, continuing while circularly acquiring data, if so, setting a key stopping mark to be 1, or setting an automatic stopping mark to be 1; (7) when the while circulation condition is not met, the oscilloscope collection program is executed out of circulation and disconnected, and the oscilloscope collection program is ended;
finally, when the user clicks 'save as MAT', all channel data are saved in an MAT format, including channels which are not opened, and the first column is sampling time; when 'save as Excel' is clicked, the opened channel is exported, the channel head line of which the signal name is selected displays the corresponding signal name, and the channel head line of 'open' is selected to display the channel name.
2. The method for continuously acquiring and displaying the data of the engine as claimed in claim 1, wherein when a user clicks a 'save as Excel' button, a save Excel program is executed, a save directory selected by the current user is saved firstly, so that the storage is convenient for the next time, and a progress bar is opened; calculating the length of the whole acquired data; calculating an Excel storage area; judging the calculated total page number, and filling the acquired data and the signal name into Excel; and after the preservation is finished, closing the progress bar.
3. A method as claimed in claim 2 wherein calculating the Excel memory area comprises: judging whether the data length and the 10^6 remainder are 0 or not; if the remainder is 0, then the total number of pages is equal to the quotient of the length and 10^6, and if the remainder is not 0, then the total number of pages is equal to the quotient of the difference between the length and the remainder and 10^6 plus 1.
4. The method for continuously acquiring and displaying data of the engine as claimed in claim 2, wherein the step of judging the calculated total number of pages and filling the acquired data and the signal name into Excel comprises the following steps: when the total page number is 1, only one page is needed, the signal name is filled into the line A1, and the collected data is filled below the line A2; and when the total page number is not 1, circularly filling each page with the signal name in the first row and filling the collected data in the other rows in sequence.
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