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A method for operating SCR catalyst having bypass flow channel

An SCR catalyst, flow channel technology, applied in engine components, combustion engines, machines/engines, etc., can solve problems such as reducing performance under cold start conditions, and achieve the effect of avoiding undesired oxidation and ensuring conversion

Pending Publication Date: 2020-09-15
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A simple solution to the described problem is actually to place the SCR catalyst further away from the internal combustion engine at generally lower temperatures, but this also degrades performance in cold start conditions and the SCR catalyst loses power after a considerable period of time reach its operating temperature of at least 200 degrees Celsius

Method used

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  • A method for operating SCR catalyst having bypass flow channel
  • A method for operating SCR catalyst having bypass flow channel
  • A method for operating SCR catalyst having bypass flow channel

Examples

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Embodiment Construction

[0021] figure 1 The engine arrangement 1 shown schematically in FIG. 2 comprises an internal combustion engine 2 , an exhaust gas aftertreatment device 5 according to the invention, a high-pressure exhaust gas recirculation device 6 and / or a low-pressure exhaust gas recirculation device 7 . The engine arrangement 1 also includes a turbocharger 9 . The turbocharger 9 includes a compressor 11 and a turbine 12 .

[0022] The exhaust gas aftertreatment device 5 according to the invention contains an SCR catalyst 8 with an inlet 16 and an outlet 17 . An inlet valve 41 is arranged upstream of the inlet 16 . The inlet to the SCR bypass flow channel 40 of the bridging SCR catalyst is arranged upstream of the inlet valve 41 . SCR bypass flow passage 40 includes SCR bypass valve 42 . The SCR bypass flow passage 40 leads to the exhaust flow passage 18 immediately downstream of the outlet 17 of the SCR catalyst 8 . The device 15 for injecting urea into the flow channel 18 is arranged...

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Abstract

The invention relates to a method for operating an SCR catalyst having a bypass flow channel. A method for operating an exhaust aftertreatment device (5) is described, the exhaust aftertreatment device (5) comprising an SCR catalyst (8) having an inlet (16), an outlet (17) and a bypass flow channel (40), where an SCR inlet valve (41) is arranged upstream of the inlet (16), wherein an inlet to thebypass flow channel (40) is arranged upstream of the inlet (16) and the bypass flow channel (40) comprises a bypass valve (42), the method comprising the steps of: determining (51) a temperature of the exhaust gas upstream of the SCR catalyst (8); opening the bypass valve (42) and closing the SCR inlet valve (41) if the temperature exceeds an established threshold (54); closing the bypass valve (42) and opening the SCR inlet valve (41) if the temperature is below an established threshold (53).

Description

technical field [0001] The invention relates to a method for operating an exhaust gas aftertreatment device comprising an SCR catalyst. The invention also relates to an exhaust aftertreatment device, an engine arrangement, a vehicle, and a computer program product. Background technique [0002] Exhaust gas aftertreatment uses mechanical, catalytic or chemical processes to clean the combustion gases after they have left the combustion space or combustion chamber of the internal combustion engine in order to comply with legal emission limit values. Combined with increasingly stringent legal requirements for emissions from vehicles, especially motor vehicles, extensive challenges arise for exhaust aftertreatment. [0003] A key challenge is to reduce nitrogen oxide emissions (NOx emissions) that occur during operation of internal combustion engines at high loads and / or at high engine speeds. Typically, nitrogen oxides are converted by means of a selective catalytic reduction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/2053F01N3/2066F01N9/00F01N3/021F01N2410/03F01N2610/02F01N2900/1404Y02T10/12Y02T10/40Y02A50/20
Inventor F·文德利希L·巴奇J·克默林C·波尔恩森
Owner FORD GLOBAL TECH LLC
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