Mill control system and method for control of metal strip rolling

摘要

Mill control system and method for metal strip rolling controlled in response to a sequence of controller scans are provided. A sensor suite is coupled to sense a plurality of parameters regarding the strip rolling. A model responsive to the sensed parameters is configured to estimate per scan at least one matrix based on the sensed parameters and indicative of state conditions of the strip rolling. A controller includes an inner control loop configured to effect a control law to generate a control vector per scan. The inner control loop may be configured to have dynamic characteristics, which remain substantially the same for each scan of the controller. The dynamic characteristics of the inner control loop are effective to determine a pointwise online control solution based on the matrix indicative of the state conditions of the strip rolling, without having to compute a Riccati control solution per scan.

主权项

1. A mill control system for metal strip rolling controlled in response to a sequence of controller scans, the system comprising:
a sensor suite coupled to sense a plurality of parameters regarding the strip rolling; a model responsive to the sensed parameters and configured to estimate per scan at least one matrix based on the sensed parameters and indicative of state conditions of the strip rolling; and a controller comprising an inner control loop to effect a control law to generate a control vector per the scan, the inner control loop configured to have dynamic characteristics, which remain substantially the same for each scan of the controller, wherein the dynamic characteristics of the inner control loop are effective to determine a pointwise on-line control solution based on the at least one matrix indicative of the state conditions of the strip rolling, without having to compute a Riccati control solution per the scan wherein said dynamic characteristics of the inner control loop are established by keeping a matrix difference (Ai(x)−BKi) substantially constant from scan to scan, wherein Ai(x) represents the matrix estimated by the model indicative of the state conditions of the strip rolling for a present scan, B represents a constant control matrix, and Ki represents a control gain matrix for the present scan.