在自动制造系统(automated manufacturing systems, AMSs)中, 死锁是一个急需解决的问题, 其主要由资源的循环等待造成. 为了解决该问题, 本文首先基于面向资源Petri网(resource-oriented Petri nets, ROPNs)的特征, 建立特殊资源标记图(special resource marked graphs, SRMGs). 其次, 在SRMGs中建立死锁与饱和回路之间的关系. 最后通过为一些特殊回路添加控制器, 阻止系统出现不安全标记. 考虑到资源故障问题, 为危险库所添加资源缓冲子网, 保证需要故障资源的零件不会阻塞其他零件的持续生产. 相比现有的控制器, 本文的监督控制器具有控制开关, 其通过实时改变控制库所的容量可以允许更多安全标记发生.
In automated manufacturing systems (AMSs), deadlock is an urgent problem to be solved, which is mainly caused by circular waiting for resources. To solve this problem, this study first builds special resource marked graphs (SRMGs) based on the characteristics of resource-oriented Petri nets (ROPNs). Secondly, the relationship between a deadlock and the saturated circuit is established in SRMGs. Unsafe markings can be prevented by adding controllers to some special circuits. Next, considering the problem of resource failure, the resource buffer subnet is added to the hazardous place. This ensures that parts requiring failed resources do not block the continuous production of other parts. Compared with existing controllers, each controller in this study has a control switch that allows more safe markings to occur by changing the capacity of the control place in real time.