Patent ID: 6957640
Filing Date: 2005-10-25
Classification: F02B,F02D,Y02T

Abstract:
1. A method of operating a compression ignition engine comprising: processing certain data to select one of plural fueling modes for operating the engine, and a) when the result of the processing selects a first fueling mode, fueling one or more combustion chambers 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, b) when the result of the processing selects a second fueling mode, reducing the effective compression ratio for each such combustion chamber from the effective compression ratio used during the first fueling mode, fueling each such combustion chamber to create a substantially homogeneous air-fuel charge within each such combustion chamber and compressing each charge to auto-ignition without introducing any additional fuel after auto-ignition during that corresponding engine cycle, and c) when the result of the processing selects a third fueling mode, fueling each such combustion chamber by introducing 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.