|
The electric furnace is the main equipment of electronic ceramic materials in the preparation process , electric furnace temperature control system plays an important role in electronic ceramic materials sintering process . Usually the temperature control system is mainly achieved by the microcontroller and PC , but its scalability and real - time poor temperature control , it is difficult to meet the special requirements of electronic ceramics sintered . With the development of embedded systems , ARM , because of its small size, low power consumption , performance characteristics and advantages , the furnace control system valued . The ARM920T core Samsung S3C2440A embedded platform as the core , the dynamic design of the cold junction compensation circuit , sampling circuit , amplifier circuit , A / D conversion circuit , output control circuit , key circuit, LCD display circuit and serial communication peripheral hardware circuit . Completion of the modular design of the system software , including sample temperature , sound and light alarm module , human-computer interaction module , output control module , fuzzy algorithm module and serial communication modules and application modules , selected on the basis of open source , but relatively stable performance of μC / OS-II as operating system. ΜC / OS-II real-time operating systems , embedded hardware platform to build a multi-task management and scheduling of the entire system . In order to correct the nonlinearity of the thermocouple sampling process , the software algorithm uses a look-up table method . For the time variability of the temperature of the electric furnace , large inertia and lag characteristics , this paper fuzzy control to the advantage of their own characteristics and other control methods , design of a dual -input single- output fuzzy temperature controller , which consists of three steps : the exact amount fuzzification , fuzzy control rule base and build a fuzzy lookup table . The core of the process is to build a fuzzy lookup table used in the heating furnace temperature control system to ensure the accuracy and stability of the temperature control .
|