Compared with traditional instruments and meters, the advantages of virtual instruments mainly lie in: First, the functions of traditional instruments and meters are determined by the manufacturer, and users cannot change their functions. The core of traditional instruments is the hardware components. The technology update is slow and the use value after elimination is not significant. The software in the virtual instrument is the key, and the user can complete the self-defined design of the function of the instrument through software programming or modification. The hardware of the virtual instrument is only used to solve the input and output of the signal. The various functions of the instrument mainly rely on software. Due to the virtual instrument's software structure and modular design, development time maintenance costs are greatly reduced, while the reuse of functional hardware components increases. In technology updating, the traditional technology of the instrument is updated slowly, and the technology of the virtual instrument is updated faster and faster with the rapid development of computer technology. The general technology update cycle is only about one year. In addition, the virtual instrument also solves the troublesome problem of troubleshooting traditional instruments. Its modular design improves the reliability of the system, prolongs the average time between failures, and when a failure occurs, it can be programmed through software, automatically. Complete a variety of status checks, find errors, locate faults, and greatly reduce the average repair time. The virtual instrument can also freely switch various operating modes and automatically realize multi-threaded parallel operation. With the support of today's powerful simulation capabilities, it is even possible to develop test programs without the need for physical instruments.

Application of Virtual Instrument in Vehicle Inspection 1. Application of Virtual Instrument in Vehicle Braking and Steering Stability Testing In the traditional automotive braking and handling stability testing process, five rounds are used for application designers. Said that once the hardware driver is available, the design of the virtual instrument system can be performed without fully understanding the internal operating procedures of the hardware.

The hardware driver is generally provided by the hardware manufacturer in the form of a source program file and a dynamic link library (DLL) file, thereby providing the user with the right and ability to modify the hardware driver so that the user can extend the instrument function and use the instrument. The initiative is really given to the user.

Application Software Development Environment The choice of application software development environment can vary depending on the preferences of the developer, but in the end it must be provided for user-friendly and powerful applications. At present, the virtual instrument system application software development environment mainly includes two kinds: one is based on a traditional text language-based platform, mainly NI LabWindows, VC++, Delphi, etc.; one is based on a graphical engineering environment, Such as HP's HP-VEE, NI's LabVIEW and so on. The introduction of a graphical software development platform can greatly reduce the burden on system developers and enable them to focus their efforts on system design, rather than scrutiny of specific software details. The virtual instrument user interface refers to the user interface of the instrument user. The general virtual instrument development environment can provide a simulated instrument operation panel, and the instrument control function can be realized through the operation of the virtual control on the panel.

It mainly measures front and rear wheel toe, front and rear wheel declination, propulsion angle, angle of containment, steering toe-in, kingpin caster, front and rear wheel camber, and other parameters. These parameters have a large amount of data and require high precision. Moreover, the accuracy of the four-wheel aligners varies greatly due to different manufacturers and technical levels. Using virtual instrument technology, not only can solve these problems, but also can better promote the modularization of the instrument and greatly improve its measurement accuracy. The use of sensors and data acquisition card to complete the measurement and transmission of data under dynamic conditions, through the hardware interface to achieve the connection with the PC computer, the ultimate realization of human-computer interface interface, complete the output of the test parameters. At the same time, the introduction of virtual instrument technology will not only shorten the measurement time, but also ensure the safety of the personnel. It is the new direction for the development of vehicle four-wheel alignment detection technology. . Application of Virtual Instrument in Automotive Anti-Lock Braking System Vehicle anti-lock braking system (ABS) is an effective part to reduce traffic accidents. At this stage, the vehicle's ABS brake is mainly detected by a reactive braking test platform. effect. However, the price of such equipment is expensive, and it is difficult to popularize the automobile inspection and maintenance units. The introduction of virtual instruments into ABS can not only realize the signal acquisition and control, analysis and processing and result display included in traditional instruments in personal computers, but also allow users to easily change, increase or decrease instruments by modifying software according to their needs. The function and scale. The system not only can complete the input data acquisition, processing, analysis, but also can complete the output data analysis, the results display, more importantly, can easily change the anti-lock control mode (ie, use different control modules to control, in order to study more The effect of this model is to reduce the investment of the test equipment, and the price is cheap, and one-time investment can be repeated many times.

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