Hybrid engine aftertreatment thermal management strategy
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A system includes an internal combustion engine producing exhaust gases as a byproduct of operation and an aftertreatment system that treats the exhaust gases. The system further includes a controller that is structured to functionally execute operations to enhance the temperature of the aftertreatment system. The controller includes an operating condition monitoring module that interprets a temperature value at a position upstream of a catalyst positioned in the aftertreatment system. The controller further includes an operating condition management module that interprets a threshold temperature value, and an engine management module that provides an engine operation command to continue engine operation in response to the temperature value being at least equal to the threshold temperature value.
26 Citations
17 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A system, comprising:
-
an internal combustion engine capable of producing exhaust gases as a byproduct of operation; an aftertreatment system structured to treat the exhaust gases, the aftertreatment system including at least one catalyst, wherein the aftertreatment system further comprises an oxidation catalyst located upstream of the at least one catalyst and a particulate matter filter located upstream of the at least one catalyst; and a controller structured to interpret a plurality of temperature values at a position upstream of the catalyst and a threshold temperature value of the catalyst, wherein the controller is further structured to provide an engine operation command to prevent a nominal control stoppage of the engine and continue engine operation to absorb heat into the exhaust gases to increase a current temperature of the catalyst in response to the one or more of an average of the plurality of upstream temperature values and at least one of the plurality of upstream temperature values at the position upstream of the catalyst being at least equal to the threshold temperature value, and wherein the controller is further structured to stop the engine in response to the current temperature of the catalyst exceeding an operational temperature of the catalyst, wherein the threshold temperature value is the current temperature of the catalyst. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification