1. A method of controlling an exhaust stream temperature at a point along 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: within an electronic controller, providing an oxidation catalyst model; monitoring a condition of an exhaust stream; calculating a hydrocarbon fuel injection flow rate for the fuel injector based on the oxidation catalyst model; controlling an operation of the fuel injector based on the calculated hydrocarbon fuel injection flow rate, to control the exhaust stream temperature at the point along 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, wherein the oxidation catalyst is provided in a catalytic converter that is located upstream from the particulate filter, wherein the catalytic converter has an outlet connected to the particulate filter and an inlet, the method further comprising the steps of: monitoring a plurality of catalytic converter inlet conditions including oxygen concentration in the exhaust stream, mass flow rate of the exhaust stream, and temperature of the exhaust stream, wherein the hydrocarbon fuel injection flow rate is calculated based on at least one of the plurality of catalytic converter inlet conditions, and wherein the fuel is injected into the exhaust stream at a location upstream from the catalytic converter.