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针对目前的热处理电阻炉存在调节时间长、控制精度低的问题,提出了基于单片机的热处理炉温度控制系统的研究。该系统以K型热电偶耦合MAX6675作为温度采集单元,对温度进行采集并转换成电压信号,然后输入AVR单片机ATmega128进行分析处理;利用自适应PID算法计算实时温度与设定温度的偏差输出控制量,单片机根据控制量对SSR进行控制,从而实现对电阻炉温度的控制。仿真实验结果表明,所设计的温度控制系统能对电阻炉温度实现快速、准确的控制。
In view of the fact that the existing heat treatment resistance furnace has a long adjustment time and a low control accuracy, a temperature control system based on a single chip heat treatment furnace is proposed. The system uses the K-type thermocouple coupled MAX6675 as the temperature acquisition unit, the temperature is collected and converted into a voltage signal, and then input AVR microcontroller ATmega128 analysis and processing; the use of adaptive PID algorithm to calculate the deviation between the real-time temperature and the set temperature output control , SCM control according to the amount of SSR control, in order to achieve resistance furnace temperature control. The simulation results show that the designed temperature control system can quickly and accurately control the temperature of the resistance furnace.