System for producing charge flow and EGR fraction commands based on engine operating conditions

A system for producing charge flow and EGR fraction commands, comprising:

• means for determining a current ambient air density;
• means for determining a current operating temperature of an internal combustion engine;
• a memory unit having a number of data sets stored therein, each data set including a subset of charge flow and EGR fraction command values optimized for either of a unique ambient pressure and a unique engine operating temperature;
• and
• an engine controller configured to select a first one of said number of said data sets having an associated unique ambient pressure or engine operating temperature that is less than or equal to a corresponding one of said current ambient air density and said current operating temperature, and to select a second one of said number of data sets having an associated unique ambient pressure or engine operating temperature that is greater than or equal to a corresponding one of said current ambient air density and said current operating temperature, said engine controller interpolating between said first and second data sets to produce charge flow value and EGR fraction commands.