Patent ID: 8156736

Claim:
A system comprising: an oxidation catalyst; an injection control module that controls a flow rate of fuel injected into an exhaust system at a location upstream from an oxidation catalyst to adjust a temperature of exhaust gas output by the oxidation catalyst; and a fuel film module that determines an accumulation rate of fuel on a surface of the exhaust system upstream from the oxidation catalyst based on the flow rate of the fuel and a temperature of the exhaust gas and that determines a release rate of fuel from the surface of the exhaust system upstream from the oxidation catalyst based on a flow rate of the exhaust gas and the temperature of the exhaust gas, wherein the injection control module adjusts the flow rate of the fuel based on the accumulation rate and the release rate to maintain the temperature of the exhaust gas output by the oxidation catalyst at a temperature greater than or equal to a predetermined temperature for regenerating a particulate matter filter downstream from the oxidation catalyst.