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This brief presents a practical application of the conventional multiloop control method for the temperature control of a television (TV) glass furnace. To control the temperatures of the TV glass furnace, two inputs and three outputs are selected as major process variables. With the process experimental data, a multi-input multi-output model is established as a combination of input-output transfer functions in the form of the first-order-plus-dead-time system. Based on the plant models, a multiloop control, which is a combination of cascade and single loops, is used, and stability and robustness are examined with respect to major uncertain model parameters. Practical implementation in a distributed control system showed satisfactory results of the proposed control algorithm for the 150-ton/day-production furnace.
Date of Publication: Nov. 2007