Research on new methods to improve the ability of on-time delivery in discrete enterprises

In order to improve the ability of on-time deliveries, the proportional integral (PI) control algorithm is proposed to apply for work-in-progress (WIP) control in discrete manufacturing systems. To guarantee the least amount of WIP in the production system, a sensitivity constrained optimization model is designed on the frequency domain. Taking certain motorcycle engine crankcases´ production system as an example, the feasibility of PI application is evaluated. Two kinds of controllers, a backlog controller and an input-rate controller, are then devised to realize the proportional and integral control in production systems. Interacting with each other, these controllers have made the engineering implementation of PI controllers a reality. Simulation results confirm that the implemented PI controllers contain good control effects.