Injection molding controller with controlled variable learning.

摘要

A controller for an injection molding machine controls the injection ram by means of profiles (350) having segments with programmable setpoints. The injection molding machine is initially controlled during each segment in an open-loop manner (354). Closed-loop control (352) is then adopted. The difference between the open-loop (OLCV) and the closed-loop (CLCV) output to the injection molding machine valves (36, 38) is used to change the setpoints with each cycle to improve the open-loop accuracy over time. The learning (353) rate of change of the open-loop setpoints decreases after the initial correction. During the open-loop control (354), the closed-loop control (352) is deactivated to prevent it from being affected by the previous open-loop error. <IMAGE>