Control Oriented Modeling of HCCI Gasoline Engines with Internal EGR

Abstract

Homogeneous charge compression ignition (HCCI) based engines are the popular source of energy for either stationary power generators or automotive applications. However, control of combustion phasing in HCCI engines is tricky since there is no direct actuation technique. HCCI engine model based upon crank angle has been used for the analysis with internal Exhaust gas recirculation (EGR) in this paper and validated with experimental data from a single-cylinder engine. The zero-dimensional & single zone dynamic engine model is formulated with conservation of mass and energy, and ideal gas law. For the purpose of analysis, whole engine has been divided into three control volumes: intake manifold, cylinder and exhaust manifold. Combustion model and heat-transfer model subsystems have been incorporated for detailed study of combustion process. The Inputs to the system are engine speed, intake temperature, exhaust throttle positions. The outputs of the model include pressure, temperature and burned gas fraction in each volume. MATLAB & Simulink have been used for the simulation. The simulation results are validated with the steady-state experimental data at different intake temperatures and exhaust throttle positions. In the future, transient validation will be conducted and dynamic model can be used for control design and hardware in the loop (HIL) simulation.