Method for diagnosing selective catalytic reduction catalyst

一种还原剂、催化剂的技术，应用在诊断选择性催化还原催化剂领域，能够解决精度低等问题，达到改进准确性、促进高准确的效果

Active Publication Date: 2014-12-17
VOLVO CONSTR EQUIP AB
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Problems solved by technology

However, this diagnostic method suffers from a relatively low accuracy with regard to the actual storage capacity of the SCR converter

Method used

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  • Method for diagnosing selective catalytic reduction catalyst
  • Method for diagnosing selective catalytic reduction catalyst
  • Method for diagnosing selective catalytic reduction catalyst

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Embodiment Construction

[0043] Aspects of the invention will hereinafter be described with reference to the accompanying drawings, which are provided to illustrate the invention and are not intended to limit the invention, wherein like names refer to like elements, and variations of said aspects are not limited. Restricted to the aspects specifically shown, but also applicable to other variants of the invention.

[0044] figure 1 An exemplary design of an exhaust gas aftertreatment system 1 of a diesel engine 2 , in particular for heavy trucks or buses or the like, is shown schematically. The particular exhaust aftertreatment system 1 shown comprises a unit 13 containing a diesel oxidation catalyst 3 and a particulate filter 4 to reduce levels of carbon monoxide (CO), hydrocarbons (HC) and particulate matter. NO from engine 2 x Emissions must also be reduced to meet regulatory emission standards, and therefore an SCR catalyst 5 is installed along the exhaust pipe 6 . Selective catalytic reduction ...

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Abstract

The invention relates to a method for diagnosing a selective catalytic reduction (SCR) catalyst (5) of an exhaust aftertreatment system (1) of an internal combustion engine (2). The exhaust aftertreatment system (1) comprises a SCR catalyst (5); an reductant injector (9) arranged upstream of the SCR catalyst (5) for injecting a reductant into an exhaust gas; and an exhaust gas sensor (11) arranged downstream of the SCR catalyst (5). The exhaust gas sensor (11) is cross-sensitive to nitrogen oxide (NOx) and ammonia (NH3) present within the exhaust gas leaving the SCR catalyst (5). The method comprises the steps of: ensuring that a SCR catalyst NH3 storage level is substantially below the current maximal NH3 storage capacity of the SCR catalyst (5); initiating over-injection of reductant by the injector (9); stopping reductant injection upon registering, by the exhaust gas sensor (11), an increasing NOx+NH3 emission level and an NOx+NH3 emission level exceeding a predefined threshold value, and when the reduction injection is stopped recording an output signal of the exhaust gas sensor (11) until an indication of a minimal or negligible SCR catalyst NH3 storage level is determined; and calculating a SCR catalyst NH3 storage capacity on the basis of the recorded output signal.

Description

technical field [0001] The present invention relates to a method for diagnosing a Selective Catalytic Reduction (SCR) catalyst of an exhaust aftertreatment system of an internal combustion engine, wherein said exhaust aftertreatment system comprises an SCR catalyst, a reductant injector arranged upstream of the SCR catalyst for reducing agent injection into the exhaust gas, and an exhaust gas sensor arranged downstream of the SCR catalyst, wherein the sensor detects the presence of nitrogen oxides (NO x ) and ammonia (NH 3 ) is cross-sensitive. [0002] The invention is applicable, for example, to vehicles with SCR catalysts, such as working machines in the field of industrial construction machinery, in particular wheel loaders and articulated trailers, and other vehicles, including, for example, compression-ignition vehicles configured to use diesel engines or similar fuel types A truck or bus powered by an engine. Background technique [0003] Current regulatory conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N9/00
CPCF01N3/106F01N3/208F01N9/00F01N2560/021F01N2560/026F01N2900/1614F01N2900/1616F01N11/00F01N2430/00F01N2550/02F01N2560/14F01N2900/0418F01N2900/1402F01N13/009Y10T436/175383G01N33/0037G01N33/0067Y02A50/20Y02T10/12Y02T10/40B01D53/9431B01D53/9495B01D2251/2062B01D2255/80B01D2257/404
Inventor 布鲁诺·戈丹
Owner VOLVO CONSTR EQUIP AB
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