Patent ID: 7748217

Claim:
A method for calculating a real-time estimated exhaust state in an internal combustion engine having a turbo-charger with a compressor and an exhaust driven turbine with a waste-gate flow path that bypasses the turbine in a parallel path, comprising the steps of: providing a controller in electrical connection to the engine and configured to calculate the real-time estimated exhaust state of the engine; measuring intake parameter values of the engine with the controller; determining a power level (P c ) absorbed by the compressor with the controller using at least one of the measured intake parameter values; determining a product term (A*B) with the controller, wherein said product term (A*B) includes a turbine power term (A) having the determined power level (P c ) and a turbine boundary term (B) having a turbine outlet pressure (P T,out ); and calculating the real-time estimated exhaust state of the engine with the controller using the determined product term (A*B), wherein the real-time estimated exhaust state is used to control operating performance of the internal combustion engine.