Patent Document ID: 8245501
Application ID: 12229869
Patent Flag: 1

Claim One:
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: providing an adaptive control model that models a portion of the exhaust system; calculating a desired fuel injection flow rate at which fuel is injected into the exhaust stream by the fuel injector, based on the adaptive control model; controlling an operation of the fuel injector based on the calculated fuel injection flow rate, to control the exhaust stream temperature at the point along the exhaust system; monitoring a condition of the exhaust stream, wherein the monitored condition is a temperature of the exhaust stream at the point along the exhaust system; determining a target temperature for the point along the exhaust system; calculating a difference between the target temperature for the point along the exhaust system and the exhaust stream temperature at the point along the exhaust system; providing a controller including a proportion gain and an integral gain; processing, by the controller, the calculated difference between the target temperature for the point along the exhaust system and the exhaust stream temperature at the point along the exhaust system, to determine a time derivative of the exhaust stream temperature at the point along the exhaust system; and providing the time derivative to the adaptive control model; determining an expected temperature based on the adaptive control model; calculating a difference between the temperature of the exhaust stream and the expected temperature; determining an error in the adaptive control model based on the difference between the temperature of the exhaust stream and the expected temperature; and changing the adaptive control model to reduce the error.