Patent ID: 8549839
Filing Date: 2013-10-08
Classification: F01N,F02B,Y02T

Abstract:
1. An exhaust control system comprising: an absorption rate estimation module that estimates a hydrocarbon energy absorption rate of a component of an exhaust system; a desorption rate estimation module that estimates a hydrocarbon energy desorption rate of the component; a rate of change module that determines a stored energy rate of change based on a difference between the hydrocarbon absorption and desorption rates; a release rate estimation module that estimates a hydrocarbon energy release rate for the component based on the stored energy rate of change; an oxidation gain estimation module that estimates an oxidation energy gain rate of the component based on the hydrocarbon energy release rate; a loss determination module that determines an energy loss rate of the component based on the oxidation energy gain rate, a conductive energy loss rate associated with the component, and a convective energy loss rate associated with the component; a total loss determination module that determines a total energy loss rate upstream of a location in the exhaust system based on the energy loss rate of the component; and a fuel control module that controls a rate of fuel injection into the exhaust system upstream of an oxidation catalyst based on the total energy loss rate and a target temperature for the location.