Patent ID: 7681394
Filing Date: 2010-03-23
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A method of operating a turbocharged diesel engine system, comprising: recirculating exhaust gas from downstream of a turbine in an exhaust line in the engine system to upstream of a compressor in an intake line in the engine system, thereby creating a charge-air mixture in the intake line; taking into a combustion chamber of the engine a portion of the charge-air mixture for combustion; injecting a quantity of fuel into said combustion chamber in an amount selected to produce a target resulting exhaust oxygen concentration upon combustion; and selectively also recirculating a portion of the exhaust gas from upstream of the turbine in the exhaust line to downstream of the compressor in the intake line in an amount to produce a desired oxygen concentration for the charge-air mixture prior to being taken into the combustion chamber for combustion.