Abstract: A system and method are disclosed for controlling the temperature of an aftertreatment system, the method including interpreting an aftertreatment indicating temperature, determining that an engine fueling requirement is zero, and disengaging the engine from a transmission in response to the aftertreatment indicating temperature falling below a first threshold value and in response to the engine fueling requirement being zero, where the engine and the transmission comprise a portion of a vehicle powertrain. Alternatively, the method may include interpreting an aftertreatment indicating temperature, determining that an engine fueling requirement is zero, and performing a reduced air flow operation through the engine in response to the aftertreatment indicating temperature falling below a first threshold value and in response to the engine fueling requirement being zero.

Abstract: An internal combustion engine system includes an engine and an aftertreatment system that is connected to the engine to receive exhaust flow from the engine. The aftertreatment system includes a passive storage device for passively storing NOx and/or hydrocarbons produced by the engine during cold start and low temperature operating conditions, and a NOx reduction catalyst downstream of the passive storage device for receiving the NOx released from the passive storage device when temperature conditions in the exhaust flow and/or NOx reduction catalyst are above an effective temperature for NOx reduction. Diagnostics of the passive storage device and/or a sensor downstream of the passive storage device are contemplated that are based at least in part on an expected sensor output in response to a storage mode of operation or a release mode of operation of the passive storage device. Furthermore, reductant injection control is provided in response to a NOx amount released from the passive storage device.

Abstract: Methods and systems are disclosed for determining a feed rate for direct introduction of a reductant gas into an exhaust stream to achieve a NOx emissions target and for controlling a reductant introduction device to admit the reductant gas into the exhaust stream at the determined feed rate.

Abstract: Systems and methods are provided for managing low temperature NOx and HC emissions, such as during a cold start of an internal combustion engine. The systems and methods include storing NOx and HC emissions at low temperatures and passively releasing and treating these emissions as the temperature of the exhaust system increases.

Abstract: A system and method includes an internal combustion engine capable of producing an exhaust stream and an aftertreatment system operationally coupled to the exhaust stream. The aftertreatment system includes an upstream selective reduction catalyst (SCR) component and a downstream SCR component that are positioned in substantially different thermal environments. The upstream and downstream SCR components are sized to fully treat the entire exhaust stream at a low temperature highest NOx conversion condition, and the downstream SCR component is sized to fully treat the entire exhaust stream at a high temperature highest NOx conversion condition.

Abstract: Solid storage media stores a reductant in a reductant source that is released from the solid storage media in a gaseous form into an exhaust system. A leak detection and/or leak mitigation system, method and apparatus is disclosed for the gaseous reductant.

Abstract: The disclosure provides a system and method for determining an amount of fuel injected or delivered by a single fuel injector in an internal combustion engine by generating one fuel injection event after the engine has stopped operating. The fuel delivered is statistically analyzed in comparison with a commanded fuel delivery amounts to determine the suitability of fuel injector on-time calibration for the analyzed fuel injector. If the fuel delivered deviates from the commanded amount of fuel delivery by a predetermined value, the fuel injector on-time calibration for the analyzed fuel injector is changed.

Abstract: Active control of one or more exhaust gas recirculation loops is provided to manage and EGR fraction in the charge flow to produce desired operating conditions and/or provide diagnostics in response to at least one of an oxygen concentration and a NOx concentration in the charge flow and in the exhaust flow.

Abstract: Systems and methods for generating and controlling generation of ammonia. The ammonia generation control system includes a communication module and an ammonia generation module coupled to the communication module. The ammonia generation module is configured to cause generation of gaseous ammonia from a solid ammonia source in response to a determination that an ammonia storage quantity in an ammonia dosing storage cartridge meets a first pre-determined threshold and a determination that an engine condition of an internal combustion engine coupled to ammonia dosing storage cartridge meets a pre-determined engine condition threshold.

Abstract: A system and method includes an exhaust aftertreatment system for an internal combustion engine having a reductant stored in a solid storage media. The reductant is released by heating the solid storage media to convert the reductant to gaseous form. The system and method determines the quality of the solid storage media by measuring operating parameters of the aftertreatment system and comparing the operating parameters to expected parameters stored in a memory of a controller of the system.

Abstract: An internal combustion engine system includes an internal combustion engine generating an exhaust gas stream and an air intake system coupled to the internal combustion engine. The engine system also includes a turbocharger that includes a turbine in exhaust gas receiving communication with the exhaust gas stream and a compressor in air receiving communication with the air intake line. Further, the engine system includes an exhaust system in exhaust gas receiving communication with the internal combustion engine. The exhaust system has a main exhaust line and a low pressure (LP) exhaust gas recirculation (EGR) line through which at least a portion of the exhaust gas in the main exhaust line downstream of the turbine is flowable into the air intake system. The exhaust system further includes an ammonia oxidation catalyst positioned within the LP EGR line.

Abstract: A gaseous reductant injection and mixing system is described herein. The system includes an injector for injecting a gaseous reductant into an exhaust gas stream, and a mixer attached to a surface of the injector. The injector includes a plurality of apertures through which the gaseous reductant is injected into an exhaust gas stream. The mixer includes a plurality of fluid deflecting elements.

Abstract: Systems and methods are provided for managing low temperature NOx and HC emissions, such as during a cold start of an internal combustion engine. The systems and methods include storing NOx and HC emissions at low temperatures and passively releasing these emissions as the temperature of the exhaust system increases.

Abstract: Methods and systems are disclosed for determining a feed rate for direct introduction of a reductant gas into an exhaust stream to achieve a NOx emissions target and for controlling a reductant introduction device to admit the reductant gas into the exhaust stream at the determined feed rate.

Abstract: A system and method includes an exhaust aftertreatment system for an internal combustion engine having a reductant stored in a solid storage media. The reductant is released by heating the solid storage media to convert the reductant to gaseous form. The system and method determines the quality of the solid storage media by measuring operating parameters of the aftertreatment system and comparing the operating parameters to expected parameters stored in a memory of a controller of the system.

Abstract: An apparatus, system, and method are disclosed for utilizing engine-generated heat in a NOx-adsorber system. The apparatus may comprise a combustion device generating a heated exhaust stream. The apparatus may include a catalytic component that initiates at least one exhaust conditioning reaction within the heated exhaust stream. The catalytic component is fluidly coupled to the engine with a downpipe segment configured to preserve a minimum temperature at the catalytic component inlet based on specified operating conditions for the combustion device. The apparatus may also include a NOx-adsorber fluidly coupled to the catalytic component with a second downpipe segment.

Abstract: A method for modifying a NOx adsorber regeneration triggering variable. Engine operating conditions are monitored until the regeneration triggering variable is met. The adsorber is regenerated and the adsorbtion efficiency of the adsorber is subsequently determined. The regeneration triggering variable is modified to correspond with the decline in adsorber efficiency. The adsorber efficiency may be determined using an empirically predetermined set of values or by using a pair of oxygen sensors to determine the oxygen response delay across the sensors.

Abstract: A system, method, and software for triggering regeneration of an adsorber connected with a flow of exhaust from an engine. An exhaust sulfur flow rate module estimates a sulfur accumulation rate associated with an adsorber as a function of a flow of fuel. A sulfur removal rate module estimates a sulfur removal rate associated with the adsorber. An accumulated sulfur loading module includes a counter the value of which is increased as a function of the sulfur accumulation rate and decreased as a function of the sulfur removal rate. A combustion manager module controls an engine to regenerate the adsorber once the counter reaches an upper threshold value.

Abstract: A method and system are disclosed for compensating a mass air flow signal produced by a mass air flow sensor in fluid communication with an air intake passageway of an internal combustion engine. A mass air flow signal produced by the mass air flow sensor is monitored and an expected oxygen concentration of exhaust gas produced by the engine is determined. A compensation parameter is determined as a function of the expected oxygen concentration and a measured value of the oxygen concentration of the exhaust gas. A compensated mass air flow value is determined as a function of the mass air flow signal and the compensation parameter.

Abstract: A system, method, and software that rapidly heats a diesel oxidation catalyst unit to an effective operating temperature at engine startup is disclosed. Upon ignition of an engine an electronic control unit is operable to lower a fresh air flow target value to a reduced fresh air flow target value as well as lower a valve opening limit of an exhaust gas recirculation valve to a reduced valve opening limit. The electronic control unit monitors a temperature value of a flow of exhaust entering the diesel oxidation catalyst unit until the temperature value reaches a first predetermined threshold value. After reaching the first predetermined threshold value, the electronic control unit causes the fuel system to set post-injection fueling to a predetermined post-injection fueling value until the temperature value of the flow of exhaust entering the diesel oxidation catalyst unit reaches a second predetermined threshold value.