Strategy for fueling a diesel engine by selective use of fueling maps to provide HCCI+RVT, HCCI+VVT, and CD+RVT combustion modes

A compression ignition engine comprising:

• a control system for processing data;
• one or more combustion chambers;
• and
• a fueling system for injecting fuel into the one or more combustion chambers;
• wherein the control system controls the fueling system using a result of the processing of certain data by the control system to select one of plural fueling modes for operating the engine such that a) when the result of the processing selects a first fueling mode, one or more combustion chambers are fueled to create a substantially homogeneous air-fuel charge within each such combustion chamber during a corresponding engine cycle and each such charge is compressed to auto-ignition without the introduction of any additional fuel after auto-ignition during that corresponding engine cycle, b) when the result of the processing selects a second fueling mode, the effective compression ratio for each such combustion chamber is reduced from the effective compression ratio used during the first fueling mode, and each such combustion chamber is fueled to create within each such combustion chamber a substantially homogeneous air-fuel charge that is compressed to auto-ignition without the introduction of any additional fuel after auto-ignition during that corresponding engine cycle, and c) when the result of the processing selects a third fueling mode, each such combustion chamber is fueled by the introduction of fuel at a time during the engine cycle when air in the corresponding combustion chamber has been compressed sufficiently to cause the fuel to combust as it is being introduced.

A compression ignition engine comprising:

• a control system for processing data;
• one or more combustion chambers;
• and
• a fueling system for injecting fuel into the one or more combustion chambers;
• wherein the control system controls the fueling system to extend the load/speed range over which HCCI combustion occurs by
• a) fueling one or more combustion chambers over a relatively lower speed/load range to create a substantially homogeneous air-fuel charge within each such combustion chamber during a corresponding engine cycle and compressing each charge to auto-ignition without introducing any additional fuel after auto-ignition during that corresponding engine cycle, and
• b) decreasing the effective compression ratio of each such combustion chamber and fueling each such combustion chamber with increased fueling over a relatively higher speed/load range to create a substantially homogeneous air-fuel charge within each such combustion chamber during a corresponding engine cycle and compressing each charge to auto-ignition without introducing any additional fuel after auto-ignition during that corresponding engine cycle.