脉冲MIG焊积分参数在线自适应控制算法

针对传统的数字PI控制对MIG焊接过程中参数变化适应能力不强,提出了一种积分参数在线自适应控制算法.控制算法可通过对控制量实时检测,能够快速、自动调整获得优化后的积分参数.根据控制算法,结合焊接电流上升沿与下降沿的固有最小时间,将积分参数分为上升沿积分参数、下降沿积分参数,在焊接设备上设计并实现了积分参数自适应控制器.结果表明,利用该算法及控制器对不同积分参数初始值均能快速搜索到适应值,实现稳定焊接.

Integral parameter self-adjustment control algorithm in pulsed MIG welding power source

Due to the fact that the parameter variety adaptability to MIG welding process was not sufficient in conventional digital PI control, an algorithm of adaptive control of on-line integral parameters was proposed. The control algorithm could obtain optimized integral parameters quickly and automatically by real-time detecting control quantity. Based on the control algorithmand the inherent minimum times of the rising edge and falling edge of the welding current, integral parameters can be divided into rising edge parameter and falling edge parameter. The adaptive controller for integral parameter was designed and implemented inside the welding equipment. The result indicated that using this algorithm and controller different initial values of integral parameters could be quickly searched for the adaptive value and a stable welding process can be achieved.