Mei, JunXia, XiaohuaZhang, Lijun2020-02-142020-02-142019Mei, J., Xia, X.H. & Zhang, L.J. 2019, 'Dynamic state feedback decoupling of a DX A/C system', IFAC PapersOnLine, vol. 52, no. 16, pp. 406-411.1474-6670 (print)2405-8963 (online)10.1016/j.ifacol.2019.11.814http://hdl.handle.net/2263/73271A temperature and humidity controller is designed for a direct expansion air conditioning (DX A/C) system making use of a state feedback decoupling approach of nonlinear control systems. It is shown that the nonlinear dynamics of a DX A/C system can be input-output decoupled by dynamic state feedback. The resulting decoupled system is of minimum phase. Thereafter, the decoupled model is used to design a pole placement controller with guaranteed stability. Unlike controllers based on approximate local linearization of the DX A/C model, the controller proposed is global in the sense that it can track temperature and humidity setpoints in the complete operating range of the DX A/C system. Effectiveness of the controller designed is demonstrated by simulation results.en© 2019, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd.State feedback decouplingDX A/C systemPole placement controlMinimum phase systemDirect expansion air conditioning (DX A/C)Article