Patent application number | Description | Published |
20100028228 | CURRENT STORAGE ESTIMATION FOR SELECTIVE CATALYTIC REDUCTION CATALYSTS - A dosing control system comprises a selective catalytic reduction (SCR) analysis module and a dosing management module. The SCR analysis module estimates an ammonia (NH3) slip rate downstream of an SCR catalyst, an NH3 conversion rate, an NH3 supply rate, and an NH3 oxidation rate. The SCR analysis module estimates an NH3 rate of change based on the NH3 slip, conversion, supply, and oxidation rates and estimates an NH3 storage change based on the NH3 rate of change. The SCR analysis module estimates NH3 stored by the SCR catalyst based on the NH3 storage change. The dosing management module controls dosing agent injection into an exhaust system upstream of the SCR catalyst based on the NH3 stored by the SCR catalyst. | 02-04-2010 |
20120255278 | RECONFIGURABLE BI-METALLIC MIXER FOR AN EXHAUST AFTERTREATMENT SYSTEM AND METHOD OF USING THE SAME - A mixer for an exhaust aftertreatment system is disclosed. The mixer includes a body portion that is configured to be disposed in an exhaust conduit of an exhaust aftertreatment system upstream of an exhaust aftertreatment device. The mixer also includes an airfoil portion that is disposed on the body portion and reversibly movable between a deployed position and a retracted position, wherein in the deployed position the airfoil portion provides a deployed resistance to an exhaust gas flow and in the retracted position provides a retracted resistance thereto, and the deployed resistance is greater than the retracted resistance, the body portion and airfoil portion comprising a mixer. The mixer further includes a bimetallic couple that is operatively joined to the mixer and configured to reversibly move the airfoil portion from the retracted position to the deployed position. | 10-11-2012 |
20130139488 | System And Method For Determining A Maximum Dose Rate Reductant - An exhaust gas treatment system for an internal combustion engine is provided, having an exhaust gas conduit, a reductant source, a temperature sensor, an intake mass air flow sensor, and a control module. The exhaust gas conduit is in fluid communication with, and is configured to receive an exhaust gas from the internal combustion engine. The exhaust gas contains oxides of nitrogen (“NO | 06-06-2013 |
20130180231 | EXHAUST AFTERTREATMENT SYSTEM - In one exemplary embodiment of an exhaust aftertreatment system, the system includes an oxidation catalyst configured to receive an exhaust gas flow from an internal combustion engine and a particulate filter positioned downstream of the oxidation catalyst, the particulate filter comprising a substrate. The system also includes a nitrogen oxide adsorbing catalyst applied to a downstream portion of the substrate and a selective catalytic reduction device positioned downstream of the nitrogen oxide adsorbing catalyst, wherein the selective catalytic reduction device is configured to remove nitrogen oxides from the exhaust gas flow. | 07-18-2013 |
20130263593 | Exhaust Aftertreatment And Exahust Gas Recirculation Systems - In an exemplary embodiment, an internal combustion engine includes an oxidation catalyst configured to receive an exhaust gas flow from the internal combustion engine, a urea injector positioned downstream of the oxidation catalyst to inject a urea flow into the exhaust gas flow and a mixer positioned downstream of the urea injector to mix the exhaust gas flow and the urea flow to form a mixed exhaust gas and urea flow. The engine also includes a particulate filter and catalytic reduction assembly positioned downstream of the mixer to receive the mixed exhaust and urea flow from the mixer to form a treated exhaust gas flow and an exhaust gas recirculation system coupled to the particulate filter to receive a portion of the treated exhaust gas flow and recirculate the portion of the exhaust gas flow to be mixed with a fresh air flow for the internal combustion engine. | 10-10-2013 |
20150308316 | INTEGRATED MIXING SYSTEM FOR EXHAUST AFTERTREATMENT SYSTEM - In one aspect, a swirl can mixer assembly for mixing a fluid with exhaust gas exhausted from an internal combustion engine is provided. The assembly includes an inlet portion including an injection area configured to receive a fluid injector for dispensing the fluid into the exhaust gas for mixing with the exhaust gas in the mixing assembly to produce an exhaust gas/fluid mixture, an outlet portion, and an extended mixing conduit fluidly coupled between the inlet portion and the outlet portion. The extended mixing conduit is curved about at least a portion of a circumference of the outlet portion to induce a swirl in the exhaust gas/fluid mixture such that the exhaust gas/fluid mixture enters the outlet portion tangentially thereto. | 10-29-2015 |
20150345354 | EXHAUST AFTERTREATEMENT SYSTEM INJECTOR AND CONTROL - In one aspect, an injector assembly for injecting a fluid into an exhaust aftertreatment system is provided. The injector assembly includes a housing having an outlet orifice and an inner wall defining a passageway, the passageway fluidly coupled to the outlet orifice and configured to supply the fluid to the outlet orifice, and a valve having a longitudinal axis. The valve is oriented within the passageway and configured to translate along the longitudinal axis between a first position and a second position. A downstream end of the valve includes a tapered wall oriented at a first angle with respect to the longitudinal axis, and the housing inner wall is oriented at a second angle with respect to the longitudinal axis. | 12-03-2015 |
20160097314 | METHOD AND APPARATUS FOR ESTIMATING NITROGEN OXIDES OUT OF AN ENGINE - A system is provided and includes a fuel module that, based on a crankshaft angle of an engine, generates a value indicative of an amount of fuel burned in a cylinder or a change in the amount of fuel burned. A heat release module, based on the value, determines an amount of heat released during a combustion event of the cylinder. A pressure module, based on the amount of heat released, estimates a pressure in the cylinder. A temperature module, based on the pressure, estimates a temperature in the cylinder. A concentration module, based on the pressure or the temperature, estimates nitrogen oxide concentration levels in the cylinder. An output module, based on the nitrogen oxide concentration levels, estimates an amount of nitrogen oxides. A control module, based on the amount of nitrogen oxides out of the cylinder, controls operation of the engine or an exhaust system. | 04-07-2016 |