摘要
空调用换热器的火焰自动钎焊过程中温度场的控制系统,是一个非线性、大延迟、时变的系统。换热器焊接过程生产工作环境复杂,影响因素多。本文结合燃烧理论、温度场回归方程的核算,确定红外热图的热点作为温度场测量点,采用结合专家经验的燃气温度场回归方程拟合控制对象的PFC数学模型,专家模态控制算法设计控制器,设计温度梯度及温差协调控制的策略,并进行验证。结果表明,设计的算法适用于实际系统,表现出操控性能好、运行稳定等优点。
During the process of automatic flame brazing of heat exchanger for air-con- ditioning, the temperature field control system is non-linear, long-delay and time-variant. During heat exchanger＇s brazing process, the production environment is complicated along with many influencing factors. Based on the combustion theory and the calculation of the temperature field distribution＇s regression equation, the hot points of infrared thermogra- phy are determined as the test points of the temperature field. The PFC math model for the controlled object is obtained by using the regression equation of combustion gas＇s temper- ature field which combines the experts＇ experience. The expert control mode is used to de- sign the controller,the temperature gradient and harmonious control method of tempera- ture-difference. And the corresponding verification is also conducted. The results show that the designed control algorithm fits the actual system,which results in good operating per- formance and stable operation.
出处
《制冷与空调》
2014年第4期74-77,49,共5页
Refrigeration and Air-Conditioning
关键词
空调
换热器
自动钎焊
高温火焰场
智能控制
温差协调
air-conditioning
heat exchanger
automatic brazing
high-temperatureflame field
intelligent control
temperature-difference coordination
