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The decoupling control is a research field related to solving this problem, which has been studied by many authors in the past. This paper addresses to propose a new decoupling control method applied for two input two output processes (TITO) with multi-time delays. Simulation results show that the performance of the system is improved in the sense, that no longer interfering between the loops is occurred as well as the process output disturbances had been completely eliminated. | Journal of Science & Technology 131 (2018) 031-035 A New Decoupling Controller for Multi-Time Delayed TITO Processes Nguyen Thu Ha*, Nguyen Doan Phuoc Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam Received: July 20, 2018; Accepted: November 26, 2018 Abstract Multiple-input–multiple-output systems (MIMO) are very popular in the industry, such as distillation column plant, liquid dispensers, infant incubators, quadruple tank. One of the difficulties to handle them is how to eliminate interactions between variables. The decoupling control is a research field related to solving this problem, which has been studied by many authors in the past. This paper addresses to propose a new decoupling control method applied for two input two output processes (TITO) with multi-time delays. Simulation results show that the performance of the system is improved in the sense, that no longer interfering between the loops is occurred as well as the process output disturbances had been completely eliminated. Keywords: MIMO, TITO, decoupling control, plant with multi-time delays 1. Introduction main purpose of decoupling control is to simplify the controller design afterward in the sense that firstly the time delayed MIMO process is decoupled and then secondly, single PID controllers are tuned for each output/input pair in it [8]-[13]. Time delays are often met in industry. They cause the reducing stability and limiting achievable response time of systems. Moreover, each input-output loop in a multivariable process has usually a different time delay. And therefore, in a particular loop its output could be affected by all the inputs through possibly different time delays [1]. As an addition to solving the decoupling control problem, this paper will present a new decoupling controller for multi-time delayed TITO processes. For handling these effects of system delays on its performance there are a huge number of methods presented in .
