Catalyst degradation determination device for exhaust purification system
A catalyst degradation determination device is provided that can determine the degradation of a selective reduction catalyst with high precision while also suppressing a temporary decline in...
View ArticleMethod for reducing urea deposits in an aftertreatment system
Various systems and methods are described for controlling a diesel aftertreatment system coupled to an exhaust system of an engine which includes a selective catalytic reduction (SCR) catalyst and a...
View ArticleTemperature control circuit for scr urea system
A system may include a urea injection device, first, second and third conduits and a valve. The first conduit may contain a fluid and may be in heat transfer relation with the urea injection device....
View ArticleAdaptive control of scr urea injection to compensate errors
A method for controlling a selective catalytic reduction injection system having a storage tank, a pump, a delivery line, and an injection nozzle includes monitoring the selective catalytic reduction...
View ArticleNox control systems and methods for controlling nox emissions
An exhaust aftertreatment system comprising a selective reduction catalyst, a NOx sensor or an NH3 sensor, a urea injector, and a dosing control unit, wherein the dosing control unit calculates the...
View ArticleExhaust purification device and exhaust purification method for diesel engine
Provided are an exhaust purification device for a diesel engine, and an exhaust purification method that utilizes this exhaust purification device enabling effective utilization of exhaust gas heat...
View ArticleExhaust purification device and exhaust purification method for diesel engine
a DPF that is disposed downstream of the selective reduction catalyst and traps PM in the exhaust gas. a turbine of a turbocharger this turbine being disposed downstream of the urea injection nozzle...
View ArticleNh3 emissions management in a nox reduction system
A system includes an internal combustion engine producing an exhaust gas, an aftertreatment system receiving the exhaust gas, the aftertreatment system including a particulate filter positioned...
View ArticleMethod for preventing choking of urea injection nozzle on scr system
A method for preventing choking of a urea injection nozzle in after run operation on a SCR system which supplies urea stored in a urea tank through a supply module, a urea injection nozzle and a urea...
View ArticleSelective catalytic reduction system
A selective catalytic reduction (SCR) system that can detect whether or not a float is stuck even where a water level sensor that detects a liquid level in a stepwise manner is used, including: an...
View ArticleMethod for detecting urea deposits in an exhaust line of an automotive...
A method is provided for detecting urea deposits in an exhaust line of an automotive vehicle and includes determination if an exhaust gases temperature is reached, if the result of determination is...
View ArticleDevice and method for controlling urea injection system of diesel engine
Disclosed are an apparatus and a method for controlling a urea injection system of a diesel engine. The apparatus () comprises: an operation condition parameter acquiring module (), a control quantity...
View ArticleMethod for in-duct urea injection for selective catalytic reduction on small...
A method for reducing NOx emissions from a lean burn combustor equipped with a NOx reducing exhaust catalyst, includes at least the following steps: (i) generating a computer based model of the...
View ArticleNh3 emissions management in a nox reduction system
A system includes an internal combustion engine producing an exhaust gas, an aftertreatment system receiving the exhaust gas, the aftertreatment system including a particulate filter positioned...
View ArticleMethod and apparatus for controlling urea injection amount of vehicle
An apparatus and method for controlling a urea injection amount of a vehicle provides precision improvement of urea injection by determining a urea injection amount according to a collection amount of...
View ArticleMethod and apparatus for controlling urea injection amount of vehicle
A method is provided for controlling a urea injection amount of a vehicle that controls urea ejection in consideration of a difference between an internal temperature change rate and a regeneration...
View ArticleSystems and techniques for heating urea injection systems
A reductant delivery system is provided for delivery of reductant to an engine exhaust aftertreatment system that is heated during cold temperature conditions. A heat exchange fluid flows through a...
View ArticleSystems and techniques for heating urea injection systems
A reductant delivery system is provided for delivery of reductant to an engine exhaust aftertreatment system that is heated during cold temperature conditions. A heat exchange fluid flows through a...
View ArticleMethod for preventing clogging of urea injection nozzle of scr system
In a method for preventing clogging of a urea injection nozzle in an after-run operation of a selective catalytic reduction (SCR) system which supplies urea stored in a urea tank through a supply...
View ArticleUrea injection systems wash cycles
Urea injection system wash cycle methods and systems are disclosed. An exemplary wash cycle method includes operating a urea injection system to provide urea solution to a first inlet of a blending...
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