Using NI LabVIEW Picture Control Toolkit, IMAQ Visualization Software, developed a notebook computer as the main body, inserting the corresponding DAQ data acquisition card, and integrating various types of sensors to form a modular vehicle-specific instrument and equipment verification. Test system.
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Introduction
For a long time, the national mandatory inspection project for the safety inspection line of the automobile industry, with engineering vehicles as the means of delivery, carries a large number of various automotive-specific verification instruments to meet the metrological verification of different parameters of the first-line instruments produced by the automobile manufacturing industry.
The newly developed virtual instrument verification and test system is designed by National Instruments' LabVIEW virtual instrument software package. It has the characteristics of simple page and easy operation. The hardware also adopts the company's multi-function data acquisition card, which has high integration. Excellent performance, good stability, etc. The sensor is made of famous brand products from various countries (such as: force sensor selects METTLER TOLEDO company, photoelectric sensor selects German DATRON company product, displacement sensor selects German HBM company product, each sensor precision control is 0.3 In the meantime, the system is excellent, and the data processing credibility is slightly higher in similar products.
LabVIEW software programming
(1) Efficient and efficient design
The “Search Example†and “Solution Wizard†sections of the National Instruments LabVIEW Picture Control Toolkit provide users with a thoughtful programming idea and a quick and easy way to use it. Ways, many examples are inconsistent, and on the basis of this slight change, you can easily become the material you need, so you can get twice the result with half the effort. For example, in the “FrequencyMeasurement†custom data acquisition solution wizard, add the “Wheel Diameter Input†function and the frequency/vehicle speed conversion formula, and connect to DATRON in Germany at the CLKB1 port of the data acquisition card. The company's photoelectric sensor products are coated with reflective paper on the side of the wheel rim to be measured to measure the rotation speed of the wheel, which can be made into an instrument for measuring the instantaneous speed of the car. It can be adapted into a highly sophisticated speed test system with some appropriate changes.
When programming the virtual instrument block diagram program, you can also find the ready-made VI subroutine that is close to the user directly in the “Opens†(Open VI) by looking for “Examples†(Activity). Make appropriate modifications on this basis. This allows you to immediately reference mature block diagrams, take less of the detours in the programming process, and accelerate the time spent on the entire development cycle. For example, the car brake pedal force and hand brake tension test system use the "Single-Point Strain Gauge Measurement" example, and then make some appropriate adaptations, using the US METTLER TOLEDO company force sensor products, Transformed into a highly sophisticated automotive brake force test system.
Compared with the single-chip development instrument, the virtual instrument has significantly reduced the workload of the hardware, which saves a lot of process of purchasing electronic components. The design difficulty of the printed circuit board is simplified, the instruments used in the installation and debugging process are greatly reduced, and the whole development cycle is shortened many times. . In addition, the plasticity of the instrument is very large, and the function can be increased or decreased according to the actual situation anytime and anywhere, and the design is improved. The superiority is incomparable; after several years of use of the instrument developed by the single-chip microcomputer, the original design function cannot be adapted because the user puts forward new requirements. The changed environment has been eliminated; after several years of application, the virtual instrument can be continuously improved and updated at any time and any place, so it is more and more perfect and closer to the user; especially when the single-chip computer develops a single special instrument, it develops special new products. The perceptual knowledge accumulated by the designer was limited to a certain scope of the time. From design to instrument, it was limited by time span and expenditure. Its reliability and stability often caused congenital deficiency and it was difficult to make up afterwards. solve. The hardware and software of virtual instruments are the wisdom of a group of organizations and a group for many years. It is a product of mass production. Its maturity, reliability and stability are unquestionable. Moreover, if there is any dissatisfaction in the software, it will be easy to make up for it afterwards. It is also a zero programming design, modular integration, and intuitive, even non-computer professional counterparts can be easily modified through simple training. The advantages of using LabVIEW in this application solution are reduced in terms of reducing development time and cost.
(2) Intelligent design
Traditional instrument intelligent data processing is almost impossible, and the virtual instrument analyzes the collected data through the built-in powerful signal processing software, which is very intuitive. The software package is simple and easy to use. It can be easily linked with Word word processing and Excel spreadsheet in Office. It can freely and scientifically calculate and word processing according to the designer's ideas, and store the standardized output test and verification report. The layout format can also be improved in time as needed.
The effect of virtual instrument from practicality to interesting penetration is also obvious. The application of picture and sound function makes the virtual instrument verification system not only meet the requirements of conventional measurement performance index design, but also meet the measurement and timing, humanized and friendly. Platform interface. To this end, it can be linked to a graphic file so that various chart files can be outputted in an illustrated manner. The pictures can also be made into cartoons, and then according to the use scenes, the male, female, old and young voices can be used to create the colorful and lively pictures to set off the regular notices, fault alarms, etc. With a friendly and friendly human taste, the user feels that it is not only a test instrument, but also a fun "partner". When encountering problems during the test and verification process, special enthusiasm is added according to the scene, which makes you feel awkward and greatly encouraged; the page alarm display shows at a glance, making you think innocent and sighing; when the test is completed, the innocent and lively cartoon The picture and the sizzling language will bring you into a heart-warming and true-minded situation. However, even after using it for a long time, the user will feel tired and tired. Fortunately, the capacity of the computer hard disk is developing rapidly, and there is no need to worry about the shortage of the hard disk. For this reason, colorful and colorful pictures, cartoons and voices are produced for different levels of users to select and output in a random order, thereby avoiding monotony. The feeling of smell.
The file input and output function is cleverly applied, which is convenient for users to learn to use the virtual instrument. You can check related performance indicators, concise usage methods and technical services from the help bar.
All in all, try to avoid the various types of features of NI products, and make the most of your potential to make the perfect instrument.
(3) Flexible and variable input and output design
Virtual instruments are used in a wide range of applications, and the number of sensors is numerous. The shape of the joints is varied, and most of them are original standard parts. They can be connected to the conventional instruments of the related series, and they are cruelly smashed into one. Shaped connectors are also unrealistic. If a variety of sockets are made on an interface board for compatibility, I am afraid to design a "massive" interface board that is several times larger than the size of the virtual instrument.
To this end, we use two options to compensate for the above defects:
1. The most commonly used typical socket on the virtual instrument is designed on multiple printed circuit boards, thus eliminating the random connection between the traditional process and the instrument chassis, and directly plugged into the input and output card slots, and Can be freely combined according to different needs.
2. If the sensor cannot be directly connected to any interface board of the virtual instrument, use a dedicated connection plug wire transition between the instrument and the sensor. Therefore, the problem of connection between the sensor and the virtual instrument is better solved. Virtual instruments are handy to build user-defined measurement schemes that truly turn things into reality.
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