Patent application number | Description | Published |
20100050616 | EXHAUST AFTERTREATMENT SYSTEM - An apparatus for treating an exhaust gas feedstream from an internal combustion engine operating lean of stoichiometry comprises a particulate filter device comprising a porous substrate element having a hydrocarbon-selective catalytically reactive washcoat. The hydrocarbon-selective catalytically reactive washcoat comprises a silver-oxide catalytic material on an alumina-based washcoat. An injection device is operative to inject a hydrocarbon reductant upstream of the particulate filter device. | 03-04-2010 |
20100098612 | METHOD AND ARCHITECTURE FOR REDUCING NOX AND PARTICULATE MATTER EMISSIONS IN EXHAUST GAS FROM HYDROCARBON FUEL SOURCE WITH A FUEL LEAN COMBUSTION MIXTURE - An exemplary method and associated architecture for reducing NO | 04-22-2010 |
20100115930 | EXHAUST AFTER TREATMENT SYSTEM - A selective catalytic reduction system for reducing oxides of nitrogen in the exhaust gas flow of an internal combustion engine is disclosed. The system has a ceramic monolith disposed within said exhaust gas flow and includes exhaust flow passages extending therethrough. A high temperature selective catalytic reduction catalyst composition is applied to an inlet portion of the exhaust flow passages and a low temperature selective catalytic reduction catalyst composition applied to an outlet portion of the exhaust flow passages. The high and the low temperature catalytic reduction catalysts are operable to reduce oxides of nitrogen at high load and low load operation of the internal combustion engine. | 05-13-2010 |
20100139251 | METHOD AND APPARATUS FOR CONTROLLING EXHAUST EMISSIONS IN A SPARK-IGNITION DIRECT-INJECTION ENGINE - Exhaust emissions from a spark-ignition direct-injection engine connected to an oxidation catalytic device and a selective catalyst reduction device having a capacity to store ammonia reductant are controlled. The engine operates in a first combustion mode to generate ammonia reductant, stored on the second aftertreatment device. The engine operates lean of stoichiometry and nitrides of oxygen in the exhaust gas feedstream are reduced on the second aftertreatment device. | 06-10-2010 |
20100221154 | METHOD AND APPARATUS FOR REDUCING NOX EMISSIONS FROM A LEAN BURNING HYDROCARBON FUELED POWER SOURCE - One embodiment includes an oxidation catalyst assembly formed by applying a washcoat of platinum and a NO | 09-02-2010 |
20100221164 | NOX EMISSION CONTROL SYSTEM FOR HYDROCARBON FUELED POWER SOURCE - A method of reducing NO | 09-02-2010 |
20100307140 | METHOD TO MONITOR HC-SCR CATALYST NOX REDUCTION PERFORMANCE FOR LEAN EXHAUST APPLICATIONS - A method for initiating a regeneration mode in selective catalytic reduction device utilizing hydrocarbons as a reductant includes monitoring a temperature within the aftertreatment system, monitoring a fuel dosing rate to the selective catalytic reduction device, monitoring an initial conversion efficiency, selecting a determined equation to estimate changes in a conversion efficiency of the selective catalytic reduction device based upon the monitored temperature and the monitored fuel dosing rate, estimating changes in the conversion efficiency based upon the determined equation and the initial conversion efficiency, and initiating a regeneration mode for the selective catalytic reduction device based upon the estimated changes in conversion efficiency. | 12-09-2010 |
20100319320 | EXHAUST GAS TREATMENT SYSTEM INCLUDING A LEAN NOX TRAP AND TWO-WAY CATALYST AND METHOD OF USING THE SAME - An exhaust gas treatment system for a diesel engine is disclosed. The exhaust gas treatment system includes a lean NO | 12-23-2010 |
20100319342 | EXHAUST TREATMENT SYSTEM FOR AN INTERNAL COMBUSTION ENGINE - A reductant delivery system for an exhaust treatment system of an internal combustion engine is disclosed. The system includes a turbocharger fluidly coupled to, and configured to receive exhaust gas from, the internal combustion engine. An exhaust gas driven turbine wheel is disposed for rotation in a turbine housing of the turbocharger. A reductant injection device is fluid communication with the exhaust gas driven turbine wheel, a reductant tank having a reductant stored therein and a conduit system fluidly connecting the reductant tank with the reductant injection device. Reductant is delivered to the reductant injection device for delivery of the reductant to the exhaust gas driven turbine wheel. | 12-23-2010 |
20110072790 | METHOD AND APPARATUS FOR MONITORING A HYDROCARBON-SELECTIVE CATALYTIC REDUCTION DEVICE - A method for monitoring a hydrocarbon-selective catalytic reactor device of an exhaust aftertreatment system of an internal combustion engine operating lean of stoichiometry includes injecting a reductant into an exhaust gas feedstream upstream of the hydrocarbon-selective catalytic reactor device at a predetermined mass flowrate of the reductant, and determining a space velocity associated with a predetermined forward portion of the hydrocarbon-selective catalytic reactor device. When the space velocity exceeds a predetermined threshold space velocity, a temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is determined, and a threshold temperature as a function of the space velocity and the mass flowrate of the reductant is determined. If the temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is below the threshold temperature, operation of the engine is controlled to regenerate the hydrocarbon-selective catalytic reactor device. | 03-31-2011 |
20110209467 | METHOD FOR SUPPLYING REDUCTANT TO AN AFTERTREATMENT SYSTEM - A method for supplying reductant into an exhaust gas feedstream for an internal combustion engine includes storing a fuel/reductant blend in the fuel storage and delivery system, separating the reductant from the fuel/reductant blend, storing the reductant in a reductant storage tank, and injecting the reductant into the exhaust gas feedstream upstream of the aftertreatment device. | 09-01-2011 |
20120079813 | OPERATING METHODS FOR SELECTIVE CATALYTIC REDUCTION OF NOx - Where oxygenated hydrocarbons, such as ethanol, may be considered for use as a reductant to be added to diesel or gasoline engine exhaust for promoting the catalyzed reduction of NOx to N | 04-05-2012 |