This paper outlines the controller development for a physics-based two-zone thermo kinetic model of HCCI/CAI engine presented in the previous work. The model accounted for both temperature and concentration inhomogeneities in the cylinder, which ultimately resulted in better prediction of the combustion parameters. The discrete nonlinear model is linearized about an operating point and the resulting linearized model is used to create an effective tracking controller. The model inputs include the variable valve timings needed to effectively control peak pressure, ignition timing and exhaust temperature. Since some of the model states cannot be monitored under transient conditions, an observer was developed to estimate the states. Two controller-observer models: controller-current observer and controller-predictor observer were designed and simulated using the same engine model. A significant difference was observed between the performances of these two models. Simulation results showed that linear controller can drastically enhance the control of combustion phasing, thereby making the control of HCCI engines practical.

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