Patent ID: 7654079

Claim:
A system, comprising: a compressor and an exhaust gas recirculation valve for communicating charge air to an intake manifold of an engine; a fuel system connected with the engine for selectively providing fuel to the engine; a diesel oxidation catalyst unit in fluid communication with an exhaust manifold connected with the engine for receiving a flow of exhaust gas; a temperature sensor for obtaining a temperature value of the flow of exhaust gas entering the diesel oxidation catalyst unit; an electronic control unit connected with the exhaust gas recirculation valve, the fuel system, and the temperature sensor; and wherein upon ignition of the engine the electronic control unit is operable to lower a fresh air flow target value to a reduced fresh air flow target value and lower a valve opening limit of the exhaust gas recirculation valve to a reduced valve opening limit, wherein said electronic control unit monitors the temperature value of the flow of exhaust entering the diesel oxidation catalyst unit until the temperature value reaches a first predetermined threshold value and upon reaching said first predetermined threshold value causes the fuel system to set post-injection fueling to a predetermined post-injection fueling value until the temperature value of the flow of exhaust entering the diesel oxidation catalyst unit reaches a second predetermined threshold value.