Abstract: An apparatus, system, and method are disclosed for efficiently increasing exhaust flow temperature for an internal combustion engine. The method includes excepting a user input to disable an exhaust valve opening mechanism. The method further includes monitoring exhaust gas mass flows and temperatures, interpreting required exhaust temperatures for aftertreatment devices, and surveying a plurality of operating conditions for a combustion engine. The method includes determining a crankshaft angle for dynamically engaging an exhaust valve open mode based on the exhaust temperature, the required exhaust temperature, and the engine operating conditions. Dynamically engaging the exhaust valve open mode includes selecting a specific crankshaft angle for each combustion cycle of the engine.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for managing regeneration event characteristics. For example, according to one embodiment, an apparatus for controlling the temperature of the outlet exhaust of an internal combustion engine for a regeneration event on a particulate matter filter includes a regeneration module and a fuel injection strategy module. The regeneration module is configured to determine a desired engine outlet exhaust gas temperature for a regeneration event. The fuel injection strategy module is configured to determine a regeneration fuel injection strategy for achieving the desired engine outlet exhaust gas temperature. The regeneration fuel injection strategy includes a main fuel injection, a first heat post-injection, and a second heat post-injection. In certain implementations, the fuel injection strategy also includes at least one or two non-heat post-injections for achieving a desired particulate filter inlet exhaust gas temperature.

Abstract: A diesel fuel composition is disclosed, as well as a method for reducing NOx and smoke emissions from a diesel engine at minimum fuel consumption which comprises adding to the diesel engine at least one diesel fuel or blending component for a diesel fuel which has a combination of a low T50 in the range of from 190° C. to 280° C., a high cetane number in the range of from 31 to 60, and optionally a high distillation curve slope in the range of from 58° C. to 140° C., which combination is effective to afford a combination of the lowest NOx and smoke emissions at the lowest fuel consumption at independent engine control values for the diesel engine that are optimum to afford production of a combination of the lowest NOx and smoke emissions at the lowest fuel consumption, whereby the NOx and smoke emissions from the diesel engine are reduced by at least 10% and 15%, respectively.

Abstract: A system includes an internal combustion ignition engine with an exhaust gas flow, a particulate filter in the exhaust gas flow, a NOx reduction catalyst in the exhaust gas flow downstream of the particulate filter, a first oxygen sensor coupled to the exhaust gas flow downstream of the NOx reduction catalyst, and a second oxygen sensor coupled to the exhaust gas flow between the particulate filter and the NOx reduction catalyst. A controller includes an exhaust conditions module that interprets a first oxygen signal from the first oxygen sensor and a second oxygen signal from the second oxygen sensor and a combustion control module that commands a high engine-out air-fuel ratio when the first oxygen signal indicates a low oxygen content and commands a low engine-out air-fuel ratio when the first oxygen signal indicates a high oxygen content.

Abstract: A technique for engine control to account for fuel effects including providing an internal combustion engine and a controller to regulate operation thereof, the engine being operable to combust a fuel to produce an exhaust gas; establishing a plurality of fuel property inputs; establishing a plurality of engine performance inputs; generating engine control information as a function of the fuel property inputs and the engine performance inputs; and accessing the engine control information with the controller to regulate at least one engine operating parameter.

Abstract: A system is described for producing an elevated exhaust temperature and reduced NOx output for an engine. The system includes an internal combustion engine having a common rail fuel system, an exhaust pressure modulation device for the internal combustion engine, and a controller structured to functionally execute operations for elevating the exhaust temperature and reducing the NOx output. The controller determines a desired engine outlet exhaust temperature, an engine speed, and an engine load. In response to the desired engine outlet exhaust gas temperature, the engine speed, and the engine load, the controller determines an exhaust pressure increase command and a fuel injection command including at least one post-injection event. The common rail fuel system is responsive to the fuel injection command, and the exhaust pressure modulation device is responsive to the exhaust pressure increase command.

Abstract: A system is provided for enhancing aftertreatment regeneration capability. The system includes an internal combustion engine producing an exhaust gas stream and an aftertreatment component that treats the exhaust gas stream, where the aftertreatment component includes a desired inlet exhaust gas temperature. The system includes an exhaust gas pressure device that modulates an exhaust pressure value, and a fuel injection system that provides a post-injection event. The system includes a controller that provides an exhaust pressure command and a fuel injection command in response to determining that a temperature of the exhaust gas stream is lower than the desired inlet exhaust gas temperature. The exhaust gas pressure device is responsive to the exhaust pressure command and the fuel injection system is responsive to the fuel injection command.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for manipulating the properties of engine exhaust at least partially through the engine's control system to increase the efficiency and performance of the exhaust aftertreatment system. According to one representative embodiment, an engine system properties controller includes an exhaust aftertreatment system module, a powertrain module, and a combustion module. The exhaust aftertreatment system module is configured to generate an exhaust conditions vector request. The powertrain module is configured to receive the exhaust conditions vector request from the exhaust aftertreatment system module and generate at least one engine operating condition target based on the exhaust conditions vector request. The combustion module is configured to receive the at least one engine operating condition target and generate at least one engine controls command based on the at least one engine operating condition target.

Abstract: According to one representative embodiment, an apparatus for reducing NOx emissions 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 NOx reduction target module and a reductant module. The NOx reduction target module is configured to determine a NOx reduction requirement, which includes an amount of NOx in 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 NOx reduction 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.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for controlling NOx conversion in a selective catalytic reduction (SCR) system. According to one representative embodiment, an apparatus includes a duty cycle factor module and a NOx conversion mode selection module. The duty cycle factor module is configured to determine a duty cycle factor of an internal combustion engine where the duty cycle factor represents predicted driving conditions of a vehicle in which the internal combustion engine is housed. The NOx conversion mode selection module is configured to command NOx conversion in the SCR system according to a first NOx conversion mode if the duty cycle factor is within a duty cycle factor range and according to a second NOx conversion mode if the duty cycle factor is not within the duty cycle factor range.

Abstract: An internal combustion engine system includes: an engine with a plurality of pistons; a variable load driven by rotary power from the engine, the load including one or more of a pump, an air conditioner; and a fan; aftertreatment equipment to control exhaust emission from the engine; a sensor to provide a sensor signal corresponding to temperature of exhaust from the engine; and a controller coupled to the sensor and operable to regulate a regeneration operation of one or more components of the aftertreatment equipment. The controller responds to the sensor signal to generate one or more control signals to adjust the variable load to increase loading of the engine and correspondingly raise the temperature of the exhaust for the regeneration operation.

Abstract: A method is disclosed for thermal management of an engine comprising a continuously variable transmission. The method includes an engine capability module storing a torque-speed map comprising a first region where the engine inefficiently regenerates an aftertreatment device, a second region where the engine efficiently regenerates the aftertreatment device, and a third region where the engine is not capable of regenerating the aftertreatment device. The method further includes an aftertreatment determination module determining a regeneration index, an operating conditions module determining an engine speed and an engine load, and a speed-load adjustment module adjusting a speed-load target. The method further includes the speed-load adjustment module adjusting the speed-load target to a preferred region along equal power curves of the torque-speed map based on the regeneration index.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for reducing NOx emissions using ammonia storage on an SCR catalyst. For example, according to one representative embodiment, an apparatus for reducing NOx emissions in an engine exhaust includes a NOx reduction target module that is configured to determine a NOx reduction 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.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for managing regeneration event characteristics. For example, according to one embodiment, an apparatus for controlling the temperature of the outlet exhaust of an internal combustion engine for a regeneration event on a particulate matter filter includes a regeneration module and a fuel injection strategy module. The regeneration module is configured to determine a desired engine outlet exhaust gas temperature for a regeneration event. The fuel injection strategy module is configured to determine a regeneration fuel injection strategy for achieving the desired engine outlet exhaust gas temperature. The regeneration fuel injection strategy includes a main fuel injection, a first heat post-injection, and a second heat post-injection. In certain implementations, the fuel injection strategy also includes at least one or two non-heat post-injections for achieving a desired particulate filter inlet exhaust gas temperature.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for managing regeneration event characteristics. For example, according to one embodiment, an apparatus for controlling the temperature of the output exhaust of an internal combustion engine for a regeneration event on a particulate matter filter includes a regeneration module, a turbocharger thermal management module, a fuel injection thermal management module, and an air intake thermal management module. The regeneration module determines a desired particulate matter filter inlet exhaust gas temperature for a regeneration event. The turbocharger thermal management module determines a variable geometry turbine (VGT) device position strategy. The fuel injection thermal management module determines a fuel injection strategy. The air intake thermal management module determines an intake throttle position strategy.

Abstract: A system for determining a NOx conversion efficiency of an exhaust gas aftertreatment component comprises means for determining an operating temperature of the exhaust gas aftertreatment component, and a control circuit. The control circuit includes a memory having instructions stored therein that are executable by the control circuit to determine a time duration that the operating temperature of the exhaust gas aftertreatment component is above a predefined temperature, and to determine the NOx conversion efficiency of the exhaust gas aftertreatment component as a function of the time duration.

Abstract: An apparatus, system, and method are disclosed for efficiently increasing exhaust flow temperature for an internal combustion engine. The method includes excepting a user input to disable an exhaust valve opening mechanism. The method further includes monitoring exhaust gas mass flows and temperatures, interpreting required exhaust temperatures for aftertreatment devices, and surveying a plurality of operating conditions for a combustion engine. The method includes determining a crankshaft angle for dynamically engaging an exhaust valve open mode based on the exhaust temperature, the required exhaust temperature, and the engine operating conditions. Dynamically engaging the exhaust valve open mode includes selecting a specific crankshaft angle for each combustion cycle of the engine.

Abstract: A method is disclosed for thermal management of an engine comprising a continuously variable transmission. The method includes an engine capability module storing a torque-speed map comprising a first region where the engine inefficiently regenerates an aftertreatment device, a second region where the engine efficiently regenerates the aftertreatment device, and a third region where the engine is not capable of regenerating the aftertreatment device. The method further includes an aftertreatment determination module determining a regeneration index, an operating conditions module determining an engine speed and an engine load, and a speed-load adjustment module adjusting a speed-load target. The method further includes the speed-load adjustment module adjusting the speed-load target to a preferred region along equal power curves of the torque-speed map based on the regeneration index.

Abstract: A system for determining a NOx conversion efficiency of an exhaust gas aftertreatment component comprises means for determining an operating temperature of the exhaust gas aftertreatment component, and a control circuit. The control circuit includes a memory having instructions stored therein that are executable by the control circuit to determine a time duration that the operating temperature of the exhaust gas aftertreatment component is above a predefined temperature, and to determine the NOx conversion efficiency of the exhaust gas aftertreatment component as a function of the time duration.