Patent ID: 8495864
Filing Date: 2013-07-30
Classification: F01N,F02D,F02P,Y02T

Abstract:
1. A method of operating an internal combustion engine having an after-treatment system that treats exhaust gas with an oxidation catalyst, the method comprising: continuously monitoring a temperature of the exhaust gas upstream of the oxidation catalyst; sensing an air mass inflow rate of combustion air flowing into the engine; determining if the air mass inflow rate is within a pre-defined range; adjusting operation of the engine to increase the temperature of the exhaust gas upstream of the oxidation catalyst to achieve a target temperature, wherein adjusting the operation of the engine to increase the temperature of the exhaust gas upstream of the oxidation catalyst includes adjusting at least one of the air mass inflow rate of the engine or a near post fuel injection rate of the after-treatment system, and maintaining current operation of the engine when the temperature of the exhaust gas is equal to or greater than the target temperature; sensing a cylinder pressure within at least one cylinder of the engine to detect the occurrence of an unstable combustion event within the at least one cylinder; and adjusting the operation of the engine to prevent a future unstable combustion event when the unstable combustion event is detected.