Patent application number | Description | Published |
20080260610 | REVERSE PLATINUM GROUP METAL ZONED LEAN NOx TRAP SYSTEM AND METHOD OF USE - The invention, in at least one embodiment, relates to a reverse platinum group metal zoned lean NO | 10-23-2008 |
20080276602 | Particulate Filter Regeneration and NOx Catalyst Re-Activation - A system and method may be provided for operating a system having an engine with an emission control system, the emission control system including a lean NOx trap and a particulate filter, where after lean exhaust gas air-fuel ratio regeneration of the particulate filter at an elevated regeneration temperature, a rich or intermittently rich exhaust air-fuel ratio is provided for a duration lasting until LNT temperature falls to a minimum threshold, where said rich or intermittently rich operation reactivates catalysts in the LNT and reverses deactivation caused by the elevated temperature lean operation associated with previous particulate filter regeneration. | 11-13-2008 |
20080314020 | Reduction of NOx Trap at Engine Shutoff - The reduction of a NOx trap upon engine shutdown is disclosed. One disclosed embodiment comprises detecting an engine shutoff, determining an engine stop position, and creating a reductive environment in the exhaust conduit upstream of the lean NOx trap at a time based upon the determined engine stop position. The creation of a reductive environment in the exhaust conduit upstream of the lean NOx trap may help to at least partially reactivate the lean NOx trap during engine shutoff. | 12-25-2008 |
20090056310 | Multi-Stage Regeneration of Particulate Filter - A method of regenerating a particulate filter in an apparatus comprising an internal combustion engine and a catalyst that employs urea as reductant for NOx is disclosed. The method comprises exposing the catalyst and particulate filter to a first, lower elevated exhaust temperature to remove urea deposits and/or stored hydrocarbon from the catalyst, and then exposing the catalyst and particulate filter to a second, higher elevated exhaust temperature to heat the particulate filter to decompose particulate matter in the particulate filter. In this manner, damage caused to the catalyst due to the decomposition and reaction of urea deposits and/or oxidation of stored hydrocarbon during particulate filter regeneration may be avoided. | 03-05-2009 |
20090260349 | AIR-INJECTION SYSTEM TO IMPROVE EFFECTIVENESS OF SELECTIVE CATALYTIC REDUCTION CATALYST FOR GASOLINE ENGINES - Embodiments are described to improve the durability of a lean NO | 10-22-2009 |
20100266471 | EXHAUST AFTERTREATMENT SYSTEM AND METHOD OF TREATING EXHAUST GAS - A diesel exhaust aftertreatment system and method are provided. The system includes a lean NO | 10-21-2010 |
20110072784 | SYSTEM AND METHOD FOR REGENERATING A PARTICULATE FILTER - A system for filtering and oxidizing particulate matter produced by a gasoline direct injection engine is disclosed. In one embodiment, engine cylinder air-fuel is adjusted to allow soot to oxidize at an upstream particulate filter while exhaust gases are efficiently processed in a downstream catalyst. | 03-31-2011 |
20110072787 | FUEL CONTROL FOR SPARK IGNITED ENGINE HAVING A PARTICULATE FILTER SYSTEM - A system for filtering and oxidizing particulate matter produced by a gasoline direct injection engine is disclosed. In one embodiment, engine cylinder air-fuel is adjusted to allow soot to oxidize at an upstream particulate filter while exhaust gases are efficiently processed in a downstream catalyst. | 03-31-2011 |
20110073088 | METHOD FOR CONTROLLING FUEL OF A SPARK IGNITED ENGINE WHILE REGENERATING A PARTICULATE FILTER - A system for filtering and oxidizing particulate matter produced by a gasoline direct injection engine is disclosed. In one embodiment, engine cylinder air-fuel is adjusted to allow soot to oxidize at an upstream particulate filter while exhaust gases are efficiently processed in a downstream catalyst. | 03-31-2011 |
20110132287 | Pump Control for Reformate Fuel Storage Tank - Various systems and methods are described for a controlling a flow of reformate fuel in a fuel system which includes a reformer and a storage tank coupled to an engine in a vehicle. The system includes a pump located between the reformer and the storage tank that is selectively operated in order to reduce parasitic losses on the system. | 06-09-2011 |
20110132290 | METHOD FOR OPERATING A VEHICLE WITH A FUEL REFORMER - A method for operating an engine with a fuel reformer is presented. In one embodiment a method for operating an engine by injecting a gaseous fuel and a liquid fuel to at least an engine cylinder is presented. The method may prioritize the injection of the gaseous fuel in response to an amount of gaseous fuel stored in a fuel storage tank. | 06-09-2011 |
20110253072 | Pump Control for Reformate Fuel Storage Tank - Various systems and methods are described for a controlling a flow of reformate fuel in a fuel system which includes a reformer and a storage tank coupled to an engine in a vehicle. The system includes a pump located between the reformer and the storage tank that is selectively operated in order to reduce parasitic losses on the system. | 10-20-2011 |
20120110981 | Reduction of NOx Trap at Engine Shutoff - The reduction of a NOx trap upon engine shutdown is disclosed. One disclosed embodiment comprises adjusting a timing of creating a reductive environment in the exhaust conduit upstream of the lean NOx trap based upon the determined engine stop position. The creation of a reductive environment in the exhaust conduit upstream of the lean NOx trap may help to at least partially reactivate the lean NOx trap during engine shutoff. | 05-10-2012 |
20130000570 | METHOD FOR OPERATING A VEHICLE WITH A FUEL REFORMER - A method for operating an engine with a fuel reformer is presented. In one embodiment a method for operating an engine by injecting a gaseous fuel and a liquid fuel to at least an engine cylinder is presented. The method may prioritize the injection of the gaseous fuel in response to an amount of gaseous fuel stored in a fuel storage tank. | 01-03-2013 |
20140311126 | AIR-INJECTION SYSTEM TO IMPROVE EFFECTIVENESS OF SELECTIVE CATALYTIC REDUCTION CATALYST - Embodiments are described to improve the durability of a lean NO | 10-23-2014 |
20150053190 | FUEL CONTROL FOR SPARK IGNITED ENGINE HAVING A PARTICULATE FILTER SYSTEM - A system for filtering and oxidizing particulate matter produced by a gasoline direct injection engine is disclosed. In one embodiment, engine cylinder air-fuel is adjusted to allow soot to oxidize at an upstream particulate filter while exhaust gases are efficiently processed in a downstream catalyst. | 02-26-2015 |