Patent ID: 8418441

Claim:
A method of controlling a total hydrocarbon slip exiting an exhaust system including an oxidation catalyst, a particulate filter including an outlet, and a fuel injector for injecting fuel into an exhaust stream at a location upstream from the outlet of the particulate filter, the method comprising the steps of: providing an oxidation catalyst model; monitoring a condition of the exhaust stream; calculating a post fuel injection flow rate; calculating a limiting total hydrocarbon slip flow rate based on the oxidation catalyst model; controlling an operation of the fuel injector at a hydrocarbon fuel injection flow rate based on a smaller one of the post fuel injection flow rate and the limiting total hydrocarbon slip flow rate, to control the total hydrocarbon slip exiting the exhaust system; determining an error in the oxidation catalyst model based on the monitored condition; and changing the oxidation catalyst model to reduce the error.