Petri net switching models and algorithm process are explained in details . system limitations and specific evaluation functions are presented for searching the best solution during the dynamic petri net nodes " transition Petri网的开关模型和算法流程在文中均有详细解析,系统约束条件和特有的评价函数用于在petri网模型节点的动态跃迁时帮助搜索出最优解。