In the 1980s, the United States successfully developed a virtual instrument (Visual Instruments, abbreviated as VI), which triggered a major change in the field of traditional instruments, enabling computer and network technology to drive straight into all major areas of the instrument. With the rapid development of the automotive industry, especially the advancement of modern electronic technology and computer technology, the advent of virtual instruments has also brought about efficient, convenient, and rapid development of automobile detection.
The reason why the virtual instrument has a strong vitality and competitiveness lies in its "development" and "scalability", then how is the application of automotive testing innovation?
According to related data, the applications of virtual instruments in the automotive field include applications in automotive testing and applications in IVDAS.
The application of virtual instruments in automotive instrumentation testing brings another problem at the same time as the mass production of automotive instrumentation. It is the inspection of finished products. The instrument assembly is the information center of modern automobiles. Its production quality is related to the safety of the automobiles and the quality of the entire vehicle. Due to the upgrading of automotive instrumentation, new products continue to appear and old instruments are not used. How to design a detection device that can be used for various types of instrumentation has become an important issue in automotive instrumentation testing. Rich practical issues.
The whole inspection system is designed through NI's hardware and software products. According to various signal parameters such as analog, digital, switch, K-Line, and CAN required for instrument testing, NI PXI series boards and Sino-Thai PCM-536 and the self-made programmable network resistor and data communication conversion card form the hardware circuit part of the system. Based on this, using NI's LabVIEW software to design the entire test system, the ultimate goal is to develop a compact, flexible, highly reliable portable detection system that can simulate the generation of most vehicle models in automotive instrumentation testing. The instrument needs various kinds of collected signal information, and communicates with the measured instrument through the CAN interface, so as to realize the real-time feedback of the vehicle status information.
The entire test system was designed through NI's LabVIEW software platform. Through practice, it has not only reduced production costs, improved inspection efficiency, and ensured the quality of the product, but also a complete automotive smart digital instrument detection system. Universal car meter detection system.
Application of Virtual Instrument in In-vehicle Inspection System (IVDAS) As one of the most common automotive electronic test applications, IVDAS is superior to the traditional in-vehicle test system, and the traditional in-vehicle test system is used independently. The data logger records only general data and alarms, while IVDAS, while recording and analyzing various sensor signals in the car, also imposes high requirements on the reliability, portability, and development of the test system.
American B&B developed IVDAS based on National Instruments LabVIEW and PXI/SCXI. The system shows the flexibility of the application of virtual instruments in the test field. The SCXI chassis is embedded with various signal conditioning modules. The mode of the module is determined by the type of signal. The integration of various signal acquisition and processing is accomplished by the LabVIEW program. IVDAS's superiority in energy uses PIX and SCXI to bring about the flexibility and scalability. Possible upgrades include: enhanced touch screen capabilities, speech synthesis, speech recognition, motion control, GPS reception, and central control units.
What are the problems with virtual instruments?
Virtual instruments make a great contribution to the detection technology of the automotive industry, but the problems that exist are also not to be underestimated. The computer program of the virtual instrument is a kind of software, which causes the calibration data to be lost or destroyed due to a certain reason, so that the reading deviates from the real value; on the other hand, it can be artificially modified, it can be based on the psychological needs of the operating personnel and may change the data The proportional relationship leads to falsification and reduces credibility.
How to deal with the problem?
Technically, the concept of legality rigidly stipulates that any newly-developed virtual instrument must form a special metrology verification document. Files with modified parameters automatically generate hidden document files and cannot be modified, leaving traces to the relevant departments. Check; In terms of management methods, the newly developed virtual instrument software has a supervision and management system for calibration data to pass the identification; in terms of the system, it is stipulated that the instrument to be tested must not modify the document parameters related to measurement within the validity period. If it can be achieved, it can play a certain inhibitory effect.
As a high-tech technology, virtual instruments have gradually entered our lives and become the mainstream trend of the test and measurement industry. The detection technology of the automotive industry is also obvious. The four advantages of virtual instrument technology, high scalability, strong development time, and excellent integration fully demonstrate that our lives are constantly "virtualized" and that networked virtual instruments will have a wider range of application prospects.
Shenyang Zhongda Huanxin Refrigeration Technology Co., Ltd.
