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为了解决现有顺序功能图无法灵活地表达自动循环与手动操作之间的工作状态转换问题,以液压动力滑台典型工作步骤为研究对象,提出了增设状态变量并插入微小分支回路的方法来保存两种状态之间的动态存储器变化过程。研究表明:重新设计后的顺序功能图与梯形图之间呈现出了更为严格的映射关系。通过图论建模发现,模型重构后连通图的最大流数量比之前有所增加,但是仍然符合图的封闭性原则,从而维持了控制系统的稳定性。通过现场观察梯形图的运行过程,控制程序在两种状态之间实现了断点无扰动切换,验证了新算法的正确性与可靠性。
In order to solve the problem that the existing sequential function charts can not flexibly express the working state transition between automatic cycle and manual operation, taking the typical working steps of the hydraulic power slide as the research object, a method of adding state variables and inserting tiny branch circuits is proposed Dynamic memory change between two states. The research shows that the redesigned sequence function diagram and the ladder diagram show a more strict mapping relationship. Through the graph theory modeling, it is found that the maximum flow number of the connected graph after the model reconstruction increases than before, but still meets the principle of closedness of the graph, thus maintaining the stability of the control system. By observing the running process of the ladder diagram, the control program achieves the bumpless switchover between the two states, verifying the correctness and reliability of the new algorithm.