Patent ID: 9062584
Filing Date: 2015-06-23
Classification: F01N,F02D,F02N,Y02A,Y02T

Abstract:
1. A method, comprising: operating an internal combustion engine to produce an exhaust stream into an exhaust system including at least one catalyst; interpreting a threshold temperature value of the catalyst; monitoring a plurality of upstream temperatures at a position in the exhaust stream that is upstream of the catalyst; in response to one or more of an average of the plurality of upstream temperatures and at least one of the plurality of upstream temperatures being at least equal to the threshold temperature value, preventing a nominal control stop of the engine while continuing to operate the engine to absorb heat into the exhaust stream upstream of the catalyst and pass the exhaust stream through the catalyst to increase a current temperature of the catalyst; and stopping the engine in response to a current temperature of the catalyst exceeding an operational temperature of the catalyst, wherein the threshold temperature value is the current temperature of the catalyst.