Patent ID: 8108128

Claim:
A method for controlling an engine, comprising: determining an amount of a fuel in a fuel component of an intake charge using at least a power output of the engine, the fuel component comprising the fuel and a fuel diluent; determining an amount of an air component of the intake charge based on the determined amount of the fuel; determining an amount of the intake charge provided, during operation of the engine, to a combustion chamber of the engine, the intake charge comprising the air component, the fuel, and a total amount of diluent comprising the fuel diluent and a diluent flow; determining the total amount of diluent of the intake charge utilizing the amount of the intake charge, the amount of the air component, and the amount of the fuel; and adjusting an amount of the diluent flow supplied to the intake charge based at least in part on the determined total amount of the diluent of the intake charge.