Patent
Emissions diagnostic system
Cho Y. Liang,Steven R. McCoy +1 more
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TLDR
In this article, an emissions diagnostic system is used with a compression ignition engine having an exhaust gas stream (36) directed into an SCR catalyst (60) capable of reducing NOx in the exhaust gas streams (36).Abstract:
An emissions diagnostic system (10) is used with a compression ignition engine having an exhaust gas stream (36) directed into an SCR catalyst (60) capable of reducing NOx in the exhaust gas stream (36). The system (10) comprises a tank (12) for storing a solution of urea, a pump (24) in fluid communication with the tank (12) for drawing the solution of urea from the tank (12), a valve 30 in fluid communication with the pump (24) and the exhaust gas stream (36) for receiving the solution of urea from the pump (24), an air pump (32) connected to the valve (30) for providing air into the valve (30) for mixing with the solution of urea, the valve (30) for spraying the solution of urea into the exhaust gas stream (36), a sensor (56) for sensing the level of NOx emissions emitted by the SCR catalyst (60), and a control module (42) connected to the sensor (56) for determining whether the level of NOx emissions is at an acceptable level.read more
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Patent
Exhaust purification device of internal combustion engine
Kenichi Tsujimoto,Shinya Hirota +1 more
TL;DR: In this article, an internal combustion engine with an HC treatment catalyst having the function of adsorbing the HC in the exhaust gas is arranged upstream of the NOx selective reducing catalyst.
Patent
Exhaust Emission Purifying Apparatus for Engine
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Exhaust gas treatment unit and measuring instrument for ascertaining a concentration of a urea-water solution
TL;DR: In this article, an exhaust gas treatment unit for conversion and reduction of nitrogen oxide compounds in a combustion system, in particular a Diesel internal combustion engine, has a storage unit for storing a urea water solution and a metering unit for metering the urea-water solution into the exhaust gas stream.
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Urea tank and base plate with an integrated heating element
Vincent Potier,Stephane Leonard,De Beeck Joel Op,Francois Dougnier,Nadja Walling,Larry Tipton,Volodia Naydenov +6 more
TL;DR: Urea tank and base plate (1) with an integrated heating element (2) in which said heating element comprises at least one flexible part which is preferably a flexible heater (3) comprising at least a resistive track affixed to one, and/or placed between two, flexible film(s) as discussed by the authors.
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System for diagnosing reagent solution quality
TL;DR: In this article, a system for diagnosing the quality of a reagent solution may comprise a source for supplying the reagent solutions to an emissions catalyst of an internal combustion engine.
References
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Patent
Reducing NOx emissions from an engine by temperature-controlled urea injection for selective catalytic reduction
TL;DR: In this paper, a modular assembly is provided for mounting inside an urea reagent tank (30) which enables controlled feeding of an aqueous urea solution to an injector.
Patent
Method and device for introducing liquid into an exhaust-gas purification system
TL;DR: In this paper, a method and a device for introducing liquid into an exhaust-gas purification system according to the invention avoids frost damage to sections of the system during shutdown times and permits operation at temperatures below the freezing point of the reducing agent solution being used.
Patent
Staged reductant injection for improved NOx reduction
TL;DR: In this article, an external reductant for an SCR vehicular NOx emission control system is selectively injected to SCR catalysts (5A, 5B) which are only at catalytically active temperatures.
Patent
Reducing NOx emissions from an engine by selective catalytic reduction utilizing solid reagents
TL;DR: Urea or other solid NO x -reducing reagent is employed in a selective catalytic reduction process on emissions from diesel and lean-burn gasoline engines as mentioned in this paper, and the reactant gas contains ammonia and is fed to the exhaust on an as-needed basis.
Patent
System for fueling and feeding chemicals to internal combustion engines for NOx reduction
TL;DR: In this paper, the authors proposed to use a separated aqueous solution of nitrogenous NOx -reducing reagent into at least a portion of the exhaust gases and directing them to a catalyst for selective catalytic reduction of NOx.