基于CAN总线的分散式高精度温度控制系统设计

介绍了一种基于CAN总线的温度控制系统,讨论了该系统在多用户条件下的智能化现场控制器的具体设计,现场控制器通过CAN总线与主控计算机相连,构成一种基于CAN总线的分散式高精度温度控制系统。系统由上位管理机、CAN适配卡和智能节点组成,采用网络拓扑结构的总线方式,以AT89C52单片机为温度控制器,通信位速率为125kbit/s。详细分析了温度控制器的技术指标与各种测温元件热端温度t的测量技术,应用二次抛物线插补法求温度t,采用积分分离消除超调及长时间振荡。论述了PID调节器参数的获得方案、自整定方法及益处等。最后,进行了仿真实验与实际应用。该系统已应用于热电厂的热网控制电路中,提高了电厂运行效率。

Design of distributed high precision temperature control system based on CAN

A temperature control system based on CAN bus is introduced and the design of multi -user field controller is described. The field controller connects to the host computer via CAN bus to build a distributed high-precision temperature control system based on CAN interface. The system consists of host computer,CAN adapter,and intelligent nodes with networked bus interface. The temperature controller is made up of single chip computer of AT89C 52 with communication rate of 125 kbit / s. The technical characteristics and measuring solution for different temperature sensors are analyzed. The temperature t is worked out through quadratic parabola interpolation and the over -adjustment and long duration oscillation are removed via integral separation. The parameter acquisition of PID adjuster,self-configuration method and its benefits are presented too. The simulation and application are performed. This system has been used in the thermal network of a thermal power plant,increasing the operation efficiency.