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| Number | Title | Issue Date |
| 8171721 | Closed loop control of exhaust system fluid dosing An exhaust line fuel injection system and associated methods of operation and control are disclosed. The fuel passes through a regulating valve connected to a pressurized fuel source and an outlet connected to an exhaust system fuel supply line. The exhaust system f... | 05/08/2012 |
| 8074443 | Pre-combustor and large channel combustor system for operation of a fuel reformer at low exhaust temperatures An exhaust aftertreatment system is provided with a large channel combustor, a fuel reformer, and a lean NOX trap. The lean NOX trap is denitrated by steps comprising: heating the fuel reformer to steam reforming temperatures by introducing vap... | 12/13/2011 |
| 8069654 | Optimized rhodium usage in LNT SCR system Rhodium utilization in LNT/SCR-based exhaust after treatment systems for medium and heavy duty trucks is reduced by operating inline fuel reformers in a certain manner. The fuel processors are operated at steam reforming temperatures to produce a reformate-containin... | 12/06/2011 |
| 8007404 | Transmission shift signal for aftertreatment device control Discontinuous torque ratio shifts by a transmission can result in complex transient exhaust conditions that can adversely affect exhaust air-fuel ratio control, which can result in ineffective regeneration. In extreme cases, the result can be irreversible damage to ... | 08/30/2011 |
| 8006484 | Systems and methods for reducing emissions of internal combustion engines using a fuel processor bypass Described here are systems and methods for reducing emissions of IC engines using a fuel processor bypass. In general, the systems described here include an exhaust pipe, a bypass pipe, a valve, a fuel processor, a fuel injector, and a NOx trap. When the ... | 08/30/2011 |
| 8006480 | Physical based LNT regeneration strategy A lean NOX trap is a diesel exhaust aftertreatment system is selectively denitrated in a manner that addresses unreliability of NOX sensor data. According to one concept, data from a NOX is ignored or given decreased weight in a period immediat... | 08/30/2011 |
| 7950226 | LNT-SCR system optimized for thermal gradient In an exhaust aftertreatment system, two LNTs having differing compositions are configured in series downstream from an inline fuel reformer. The downstream LNT is adapted for desulfation at higher temperatures than the upstream LNT. During desulfation, the system d... | 05/31/2011 |
| 7810315 | LNT regeneration strategy to reduce NOx spike Systems and methods are disclosed for ameliorating NOx slip from a lean NOx trap by reducing the amount of hydrocarbons reaching the lean NOx trap during the early stages of, or in a period immediately preceding, a rich regeneration. In one embodiment, a hydrocarbon... | 10/12/2010 |
| 7788906 | Methods and systems for controlling internal combustion engines Described here are systems and methods for controlling IC engines. In one aspect, a method for controlling a fuel processor is provided, the method including i) determining a temperature of an exhaust flow to the fuel processor, the fuel processor including a fuel p... | 09/07/2010 |
| 7727419 | Reformer and reforming process for production of hydrogen from hydrocarbon fuel The invention provides methods and systems for catalytic reforming of a hydrocarbon fuel to produce hydrogen, which may be used as a power source for a fuel cell. In some embodiments, hydrogen is produced by partial oxidation or autothermal reforming of fuel in an o... | 06/01/2010 |
| 7685813 | LNT regeneration strategy over normal truck driving cycle Partial denitrations are made practical by an SCR catalyst placed downstream of a NOx adsorber. The SCR catalyst permits partial denitrations to be extended to where a favorable fuel penalty rate presented by driving conditions can be utilized to a sufficient extent... | 03/30/2010 |
| 7669408 | LNT desulfation strategy with reformer temperature management Desulfation methods for an exhaust treatment system having a fuel reformer configured upstream of a LNT. Reductant is injected upstream of the fuel reformer. The reductant reacts within the reformer to generate heat, but the system is configured for some reductant t... | 03/02/2010 |
| 7650746 | Hybrid catalyst system for exhaust emissions reduction One aspect of the invention relates an exhaust treatment system having an SCR reactor following a NOx adsorber. Syn gas is used to regenerate the NOx adsorber. Another aspect relates to an LNT/SCR provided with an ammonia source separate from the LNT. A further aspe... | 01/26/2010 |
| 7648785 | Clean power system One aspect of the invention relates to a clean power generation system in which an internal combustion engine is operated to produce shaft power and an exhaust stream. The exhaust stream is processed by a fuel cell. Fluctuations in power demand are met, at least in ... | 01/19/2010 |
| 7628009 | Exhaust aftertreatment system with transmission control A power generation system comprising a LNT for exhaust aftertreatment. The LNT has an effective operating temperature range. When the LNT is near a limit of its effective operating temperature range, the transmission is used to select operating points that increase ... | 12/08/2009 |
| 7624570 | Optimal fuel profiles A method is provided for regenerating a LNT in a diesel engine exhaust aftertreatment system. Typically, the aftertreatment system comprises a fuel reformer, a LNT, and a SCR catalyst in that order. Over the course of the regeneration, the concentration or flow rate... | 12/01/2009 |
| 7614214 | Gasification of soot trapped in a particulate filter under reducing conditions A power generation system comprises a diesel engine, a diesel particulate filter and a LNT configured to receive the exhaust from the DPF. The DPF is provided with a catalyst coating that is functional to catalyze methanation of trapped soot with H2 conta... | 11/10/2009 |
| 7610752 | Devices and methods for reduction of NOemissions from lean burn engines The invention provides devices and methods for generating H2 and CO in an O2 containing gas stream. The invention also provides devices and methods for removal of NOX from an O2 containing gas stream, particularly the oxyg... | 11/03/2009 |
| 7610751 | Fuel injection before turbocharger One concept relates to power generation system, comprising a diesel engine, an exhaust manifold, a turbocharger, and an exhaust line in which are configured a fuel reformer and a LNT. A fuel injector is configured to inject fuel into the manifold upstream of the tur... | 11/03/2009 |
| 7562522 | Enhanced hybrid de-NOx system An exhaust aftertreatment system including a lean NOx trap, an ammonia-SCR catalyst, and an additional catalyst configured in between. The lean NOx trap adsorbs NOx from lean exhaust and produces ammonia during regeneration. The SCR catalyst adsorbs most of that amm... | 07/21/2009 |
| 7533521 | System and methods for improved emission control of internal combustion engines using pulsed fuel flow The present invention provides systems and methods to improve the performance and emission control of internal combustion engines equipped with nitrogen oxides storage-reduction (“NSR”) emission control systems. The system generally includes a NSR catalyst, a fu... | 05/19/2009 |
| 7434387 | Integrated DPF-reformer A method of operating a power generation system involves operating a diesel engine to produce exhaust that is passed first through a combined DPF-fuel reformer and then a LNT. In response to the control signal to regenerate the LNT, fuel is injected into the exhaust... | 10/14/2008 |
| 7412823 | LNT desulfation strategy A fuel reformer is configured in an exhaust line upstream of a LNT. To desulfate the LNT, over a first period, fuel is provided to the exhaust to make the exhaust rich. While producing reformate, the reformer is allowed to heat to a relatively large extent, typicall... | 08/19/2008 |
| 7334400 | Valveless dual leg exhaust aftertreatment system An exhaust aftertreatment system comprising two or more branches, at least one of which contains a NOx adsorber-catalyst. The branches unite downstream into a trailing conduit that contains an ammonia-SCR catalyst. Ammonia generated by the NOx adsorber-catalyst duri... | 02/26/2008 |
| 7257941 | Model based diagnostics of an aftertreatment fuel dosing system The invention relates to systems and methods of detecting faults in an exhaust line fuel injection system. An expected relationship between a temperature within the exhaust system and a commanded fuel injection rate or amount is compared to an actual relationship in... | 08/21/2007 |
| 7251929 | Thermal management of hybrid LNT/SCR aftertreatment during desulfation In an exhaust aftertreatment system comprising a NOx adsorber-catalyst followed by an SCR catalyst, means are provided for preventing the SCR catalyst from becoming heated to near the same peak temperatures as the NOx adsorber-catalyst during desulfation. In one emb... | 08/07/2007 |
| 7240483 | Pre-combustors for internal combustion engines and systems and methods therefor Described here are systems and methods for treating fuel injected exhaust streams. In general, the systems comprise a fuel injector, a pre-combustor, and a fuel combustor. The methods described herein include methods for regenerating a NOx trap or a DPF, ... | 07/10/2007 |
| 7213395 | Hybrid catalyst system for exhaust emissions reduction One aspect of the invention relates an exhaust treatment system having an SCR reactor following a NOx adsorber. Syn gas is used to regenerate the NOx adsorber. Another aspect relates to an LNT/SCR provided with an ammonia source separate from the LNT. A further aspe... | 05/08/2007 |
| 6932063 | Internal EGR cooler One aspect of the invention relates to cooled internal EGR. Cooled internal EGR is achieved by selectively admitting exhaust to an intake manifold. A heat exchanger is used to cool the exhaust within the intake manifold. Another aspect of the invention related to an... | 08/23/2005 |
| 6671541 | Cardiovascular imaging and functional analysis system A cardiovascular imaging and functional analysis system and method is disclosed, wherein a dedicated fast, sensitive, compact and economical imaging gamma camera system that is especially suited for heart imaging and functional analysis is employed. The c... | 12/30/2003 |
| 6597940 | Methods of detecting occlusion of the coronary artery system and imaging the heart One aspect of the present invention relates to screening patients for an early stage of coronary artery disease. According to this method, a patient is screened based on the time-activity curve for a radioactive tracer passing through a left ventricle reg... | 07/22/2003 |
