Design And Implementation Of Fusing Temperature Control System For Copier Based On STM32

The information age has witnessed an increasing development of the automation of office equipment,among which the copier has been playing a vital role in public's daily life,work and scientific research.However,there are still huge gaps in the research and development of the copier between China and foreign countries,like the United States of America and Japan,which have held almost the whole share of domestic market of copier with their master of key technologies in materials,devices,structure and control.Due to the importance of copier in the field of office equipment,an over dependence on foreign copier imports will cause a potential danger to domestic information security.Hence,the great significance of research in the key technologies of copiers is not only to the improvement of localization of Chinese copier industry and its competitiveness,but to the safeguard of national information security.In this thesis,a system to control copier's fusing temperature has been designed and implemented based on the practical requirements and technical indicators of a science program of laser copier in the university where the author has been studying.In this thesis,an introduction to the electrostatic imaging principle of copier has been made with the focus on the composition and working model of the copier's fusing module.The specific design of the system to control copier's fusing temperature has been finalized on the basis of the architecture of its controlling system and project's demand.According to the characteristics of the time-delay and non-linearity of the surface temperature of the heating roller in the fusing operation of the copier.Based on the fuzzy theory,this thesis proposes a fuzzy self-tuning PID control strategy which combines the fuzzy control calculation with the traditional PID control algorithm,and completes the construction of the controller according to the structure principle and design steps of the fuzzy PID controller.At the same time,in order to be able to accurately describe the input and output of the system,in order to determine the optimal control parameters of the control algorithm,this paper carried out mathematical modeling of the entire temperature control system,established the transfer function of the system,and the system was simulated,and analyzed the simulation results.In the part of hardware design,the selection of key devices and the design of each function module circuit of the system are completed.The design and realization process of the temperature acquisition circuit,heating control circuit and overheat protection circuit in the peripheral circuit are discussed in detail.In the software design part,through the modular design idea,the system has completed the program design of each module,including the main control module,data processing module,control algorithm module,data transmission module,software protection module and the upper computer software design.Finally,the whole temperature control system is integrated into the whole machine of the copier,and the control effect of conventional PID control algorithm and fuzzy PID control algorithm is compared,and the system test is completed.The results show that the whole temperature control system has stable performance and good temperature control effect,which can meet the requirements of the design objectives and realize the automatic control function of the fusing temperature of the copier.The fusing temperature control system of the copier designed in this thesis can be successfully applied to the domestic laser copier,which has a certain positive significance for improving the core competitiveness of the domestic copier.At the same time,the technology and methods involved provide ideas and approaches for the follow-up research on the localization of the copier.