Study And Implementation Of Control System For Ferment Pot Of Microorganism Based On Embedded-system

The 21st century is the time of science and technology. Along with microorganism technology swift and violent development, the equipment technique of manufacture and the microorganism reaction process control, which have a correlation with the microorganism technology, have the considerable progress. The fermentation pot, which is used in microorganism reaction process control, has the widespread application in many areas, such as biology, drugs manufacture and food and so on. Recently, as our technology of fermentation industry control is quite backward, and mainly depends on manual control, our control technology can not adapt the trend of equipment large scale, high efficiency and automatization.On 21st century, Embedded-system is a new technology, which has a widespread application. It can be used in industry control system, the information and electrical area, the medical instrument area, the military installations area and so on. Especially in area of industry control system. Followed this thought, we focus on the research of control system for microorganism fermentation pot based on embedded-system, for the purpose of changing the backward aspect of our control technology on fermentation industry area and raising our technical level.Firstly, this article studies the microorganism fermentation theory and the fermentation pot control system theory. Secondly, in view of existence problem of the fermentation pot control system, as well as the microorganism growth influence factor, we raised a method of self-adjust PID based on apery of brainpower and fuzzy theories for temperature control link during the microorganism fermentative process. Then we designed the corresponding controller. Thirdly, with the consideration of the influence of microorganism fermentative process as well as the microorganism growth characteristic by DO, we analysis the DO control link during microorganism fermentative process. Then we propose Three Step DO Control theory. This theory can be divided into three stages during control: the first stage uses the change compressed air current capacity to control DO, the second stage uses the change rotational speed to control DO, the third stage uses O2 and N2 controls DO.On the foundation of theory analysis, we developed the hardware system scheme for microorganism fermentation control, which consist of temperature module, rotational speed module, PH module and DO module and so on. Then, we use Dynamic C of Z-world Corporation, the EB500 software and the KINGVIEW software separately to establish the fermentation control software system made up of lower-position machine, Human-computer interface and interface of on-position machine.Then we use the MATLAB tool to carry on mathematics modeling, the simulation and the analysis for the fermentative process temperature control link. It turns out that, on similar control object and similar control condition, compared to the traditional PID control, the control effect of self-adjust PID based on apery of brainpower and fuzzy theories is much better, and has the characters of quick response speed and no over modulation. The result show that when on the rise stage, the system's adjustable speed is quicker nearly 23%, and on the drop stage, it is nearly 50%. Undoubtedly, its control effect is much better than the traditional control.After that, we applied the Three Step DO Control theory in the actual production and collected the corresponding production data. Then we used the MATLAB tool to analysis the data. The analysis result shows that, in the initial period of fermentation, the use of Three Step DO Control theory use can let the DO quantity drop smoothly form the very high quantity to the setting value. In the intermediate stage, it was not enough to control DO just by the method of control speed. Just by speed control, the control error can switch from 4% to 35%; but when we used the Three Step DO Control theory, the error just switch from 0 to 5%. It is obvious that the Three Step DO Control theory is very effective to the microorganism raise. And it can also prevent the phenomenon of oxygen poisoning, and simultaneously save the energy. It will be a method of promoted prospect.