Patent ID: 8001779

Claim:
A method for inducting intake air into an engine of a turbocharged engine system, the method comprising: during a first engine operating condition, actuating a metering and selecting valve in the engine system to route engine exhaust from a take-off point upstream of a turbine to a mixing point downstream of a compressor mechanically coupled to the turbine; during a second engine operating condition, actuating the metering and selecting valve to route engine exhaust from a take-off point downstream of the turbine to a mixing point upstream of the compressor; during a third engine operating condition, adjusting one or more of an intake valve timing and an exhaust valve timing to increase an amount of engine exhaust from a previous combustion that remains in a combustion chamber of the engine at a time of ignition; and during a fourth engine operating condition, actuating the metering and selecting valve to route engine exhaust from the take-off point upstream of the turbine to the mixing point upstream of the compressor.