Cummins IP, Inc.

Cummins Emission Solutions Inc.

Cummins Inc.

Weiwen Wang

Phanindra V Garimella

John N Chi

Joan M Wills

Abdul R Ofoli

Joe V Hill

Timothy R Frazier

Daniel D Wilhelm

Tony James Hall

Yinghuan Lei

Lisa Farrell

Aleksey Yezerets

Neal W Currier

Andrew W Osburn

James A Cramer

Emrah Arslanturk

Jeremiah C Nethercutt

Andy Osburn

A method, controller, and internal combustion engine including the controller and operable in accordance with the method by: determining a temperature of a working liquid in an engine block circuit () of the internal combustion engine (), the working liquid comprising a cooling liquid or a lubrication liquid; operating the internal combustion engine (); engaging a thermal load responsive to the temperature of the liquid being below a first temperature threshold, wherein engaging the thermal load comprises at least one of increasing a pumping load of the internal combustion engine (), or changing an air/fuel ratio, thereby adding heat to the engine block circuit (); controlling the thermal load as a function of the temperature of the liquid; and disengaging at least a portion of the thermal load responsive to the temperature of the liquid being above the low temperature limit.

Internal combustion engine and method to increase the temperature of a liquid in the internal combustion engine

A system can include an engine, an aftertreatment system with a particulate filter, and a controller. The controller is configured to compare a time value since a last delta pressure soot load estimate process to a predetermined time threshold. Responsive to the time value being greater than or equal to the predetermined time threshold, the controller decreases a flow threshold value to a lower flow threshold value. If the flow amount is greater than or equal to the lower flow threshold value, then the controller activates a delta pressure soot load estimation process. A combined soot load estimate is then calculated using a delta pressure soot load estimation of the delta pressure soot load estimate process responsive to the lower flow threshold value.

Soot load estimation during idle or low load

According to one representative embodiment, an apparatus for controlling reductant dosing in an SCR catalyst system having a reductant injection system configured to inject reductant into an exhaust gas stream includes a controller, an actual reductant dosing rate module, and a reductant doser compensation module. The controller is configured to determine a reductant dosing rate command representing a desired reductant dosing rate. The actual reductant dosing rate module is configured to determine a predicted actual reductant dosing rate based at least partially on the reductant dosing rate command. The reductant doser compensation module is configured to determine a modified reductant dosing rate command based at least partially on the predicted actual reductant dosing rate. The reductant injection system injects reductant into the exhaust gas stream at a rate corresponding to the modified reductant dosing rate command.

Apparatus, system, and method for controlling reductant dosing in an SCR catalyst system

According to one representative embodiment, an apparatus for reducing NOemissions in an engine exhaust gas stream of an engine system having a selective catalytic reduction (SCR) system with an SCR catalyst positioned downstream of a reductant injector includes a NOreduction target module and a reductant module. The NOreduction target module is configured to determine a NOreduction requirement, which includes an amount of NOin the exhaust gas stream to be reduced on the SCR catalyst. The reductant module is configured to determine the amount of reductant added to the exhaust gas stream to achieve the NOreduction requirement. The amount of reductant added to the exhaust gas stream is a function of at least one ammonia storage characteristic of the SCR catalyst, at least one reductant-to-ammonia conversion characteristic, and a conversion capability of an AMOX catalyst in exhaust receiving communication with the SCR catalyst.

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Various embodiments of an apparatus, system, and method are disclosed for reducing NOemissions using ammonia storage on an SCR catalyst. For example, according to one representative embodiment, an apparatus for reducing NOemissions in an engine exhaust includes a NOreduction target module that is configured to determine a NOreduction requirement. The apparatus also includes an ammonia storage module that is configured to determine an ammonia storage modifier. An ammonia target module of the apparatus is configured to determine an ammonia addition requirement. The ammonia target module is communicable in data receiving communication with the ammonia storage module to receive the ammonia storage modifier, which is added to the ammonia addition requirement. The apparatus also includes a reductant target module that is configured to determine a reductant injection requirement that includes an amount of reductant added to the exhaust gas stream to achieve the ammonia addition requirement.

Various embodiments of an apparatus, system, and method are disclosed for reducing NOemissions on an SCR catalyst. For example, according to one representative embodiment, an apparatus for reducing NOemissions in an engine exhaust includes a NOreduction target module that is configured to determine a NOreduction requirement that includes an amount of NOin the exhaust gas stream to be reduced on a selective catalytic reduction (SCR) catalyst. The apparatus also includes an ammonia target module that is configured to determine an ammonia addition requirement that includes an amount of ammonia added to the exhaust gas stream to achieve the NOreduction requirement. The apparatus also includes a reductant target module that is configured to determine a reductant injection requirement that includes an amount of reductant added to the exhaust gas stream to achieve the ammonia addition requirement. The apparatus further includes a reductant limiting module that is configured to determine whether at least one reductant limiting condition is met and to limit the amount of reductant added in response to the at least one reductant limiting condition if the at least one reductant limiting condition has been met.

Growing community of inventors

Columbus, IN, United States of America

Weiwen Wang