Modeling and control of gasoline direct injection stratified charge (DISC) engines

In this paper, we present a phenomenological nonlinear dynamic model for direct injection stratified charge (DISC) gasoline engines and discuss several key control problems for this advanced technology powertrain. The model is developed and validated using dynamometer engine mapping data obtained from a 4-cylinder DISC engine. It captures the static behavior of the key components of a DISC engine, such as the torque and emissions generation and volumetric efficiency, as well as the essential dynamics for the intake manifold and engine rotational inertia. It is shown that the multimode operation of a DISC engine dictates a hybrid model structure and also requires a coordinated multivariable control strategy to achieve expected performance.