Design Of Crystal Kettle Temperature Monitoring System Based On CAN-bus

Artificial crystal has a wide application and huge market in piezoelectrictechnology, optical technology and decorative stones. With the advancement oftechnology and people’s living standards improve, requirements for artificial crystalquality are also increasing. Temperature is the key factor in the quality of the crystal,development of a reliable, with high performance crystal kettle temperaturemonitoring system to improve product quality and production efficiency. It plays animportant role in ensuring stability and security of the production process.In this paper, for the current crystal kettle temperature monitoring system a study,with the current status of research, analysis of artificial crystal production processcharacteristics and functional requirements. By way of comparison commonmonitoring methods and control strategies, combining theory and practice, usingideas of fieldbus, CAN networks can be constructed to achieve the communication ofconditioning unit and monitor machine, the crystal kettle temperature monitoringsystem interface can be developed based on LabWindows\CVI, a database system canbe created for storing data, research fuzzy PID control algorithm and analysis verifyits feasibility and superiority in the crystal kettle temperature control. Start work fromthe following aspects Specifically:Firstly, through comparative analysis, this article choose to build monitoringnetwork system using CAN bus. Good communication protocol can ensuremonitoring machine and adjust the unit to achieve efficient communication, in thedesign of communication protocol, the communication protocol can be redefined andexpanded on the basis of the frame structure CAN2.0A. Do a breakdown of thecommunication protocol, into-initiated monitoring and regulating means to initiate acommunication protocol communication protocol.Secondly, in terms of monitoring software, according to the system functionalrequirements, the man-machine interface is divided into system configuration, systemappearance, unit monitoring, trend curves, alarm screen, running logs, databaserecords and other seven functional modules, each occupying a secondary interface.Then access to the database of programming methods are described in detail,including the linking method and database systems, database access methods and data backup and database forms automatically create methods.Finally, the system is designed according to the characteristics of the systemcontrol strategy， crystal kettle entire heating process is divided into three stages,individually controlled according to the characteristics of each stage. On the basis ofthe soaring curve modeling method, this paper proposes a polynomial fitting amathematical model of the system. The fuzzy PID control algorithm can beresearched, based on experience and testing manual operation on the fuzzy controlrule, gives the input and output on the field, simulation of fuzzy PID control inCrystal kettle temperature control either control precision, efficiency or robust thanthe traditional PID has significantly improved.