Multi-temperature Control System Algorithm And Robust Performance Analysis

Along with the development of science and technology, the multitemperatual zones control system has already applied to the industrial production and our daily life. The object of paper studies is the multitemperatual zones reflow soldering machine which is applied to soldering of SMT. In order to improve the temperature control precision of the reflow soldering machine, it need to use more advanced control algorithm. To estimate the algorithm applied in the reflow soldering system, it analyzes the robust performance of the control system. By comparing the robust performance of the control system applying two algorithms, it distinguishes the effect of two algorithms to control performance of the control system.Based on the introduction of robust knowledge, the system robust performance criterion and the analysis of reflow soldering machine's structure, an uncertain model is established for each warm area when machine works in the operating mode 2 and 3. The uncertain model has the feedback structure. Firstly, it carries on the simulation to control system using Z-N PID algorithm to, then a sensitivity minimal H_∞control robust PID is proposed. The simulation of the uncertain model is executed simultaneously. And it makes comparison with the simulation results of two algorithms.Through the comparison, it shows that, dynamic performance of system which uses the robust PID algorithm surpasses the one using Z-N PID algorithm. Based on MATLAB simulation to the control system which applies two algorithms, integral error is analyzed, it shows that the stability performance of the control system which adopts robust PID algorithm is better than the other algorithm. The conclusion is: the robust performance of the multitemperatual zones control system using the robust PID algorithm is better than the one using Z-N PID algorithm.