At present, the detection and management systems of motor vehicles in China are divided into centralized control and distributed control according to the microcomputer control mode.
The centralized control system uses a master controller to complete the registration of motor vehicles and the detection of various items on the entire line, without a station control machine. The analog quantity, switching quantity and pulse signal of each station on the test line are transformed and isolated and directly entered into the host. Therefore, the overall system structure is relatively simple, easy to install, debug and maintain, and the system cost is lower. The main disadvantage of the centralized control system is that the host computer has heavy tasks, that is, it is necessary to log in to the vehicle to be inspected, and it is also necessary to monitor the detection status of each station, and the operator is often prone to miss one. In addition, the detection line is generally long (the entire line is about 50 to 70 meters long), and the operator can only observe the detection of each station at a relatively long distance. Once an abnormality is detected, it is difficult to find and handle it nearby. In view of the above reasons, and the drastic reduction in computer prices, more distributed control systems are currently used. The tasks of each computer in this type of system are clear, the workload is relatively balanced, and it is easy to control the test signals of various stations to be sent to the workstation computer, which improves the reliability of the system.
In some unexpected situations, the operator can manually operate the workstation. Therefore, the distributed measurement and control system is obviously superior to the centralized control system in terms of application scope, scalability, maintainability, and single-point failure. The system consists of a login management machine, a server, and four workstation computers to form a distributed measurement and control system. Ordinary local network MODEN hub (I-lzB) four stations three stations one station machine Figure 2 Ethernet network in the small network, easy to install and maintain, to meet the requirements of most of the customer loading, currently Most widely used. The physical network topology of the LAN is widely used due to its low cost, easy expansion, and easy isolation of faults. The network operating system, WindowSNT, not only has such support for symmetric multiprocessors, deep embedded security, preemptive multitasking, and software fault-tolerant systems (including striping sets with odd and even parity (including RAIDS)). In addition to advanced performance, it provides a comprehensive Internet/Intranet solution, especially its industrial-grade stability, security, and reliability brought by the NTFS file system is especially necessary for automatic detection lines.
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