Torque-oriented control of an homogeneous charge compression ignition vehicle

This paper presents a torque-oriented structure designed for a diesel homogeneous combustion compression ignition (HCCI) engine control. The proposed controllers are designed to get the maximum benefit provided by the HCCI combustion system. The engine control issues comes from the sensitivity of the HCCI combustion system and from the complexity of the intake system. The proposed control structure combines several controllers presented in previous papers. Each controller is adapted in order to takes into account of the constraints inferred by this specific engine architecture and combustion system. The air path controller copes with a nonlinear coupled multivariable system. The fuel path controller is designed to ensure a good coordination with the airpath system dynamic. These two aspects with the corresponding control strategies are presented in this paper. The HCCI engine is embedded into a demonstration car and the torque structure is adapted accordingly. The controller performances are evaluated during New European Driving Cycle (NEDC) at the rolling test bed.