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Method for monitoring methane oxidation catalysts

A methane oxidation and catalyst technology, applied in the electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, machines/engines, etc., can solve difficult monitoring, non-severe temperature characteristics, and less change in heat release value There are problems such as characteristics

Active Publication Date: 2020-06-16
ROBERT BOSCH GMBH
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  • Abstract
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  • Application Information

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Problems solved by technology

But with respect to methane oxidation catalysts, such monitoring is often difficult because the change of the exothermic value during methane conversion in methane oxidation catalysts is not so characteristic due to the less drastic temperature behavior of methane oxidation catalysts

Method used

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  • Method for monitoring methane oxidation catalysts

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Embodiment Construction

[0021] The drawing schematically shows the arrangement of components of an exhaust gas aftertreatment system according to the invention, which are arranged in the exhaust system of an internal combustion engine 10 . The internal combustion engine 10 is in particular a gas engine or a diesel / gas engine capable of lean-burn operation, which can be operated with a mixture of gas and diesel. In order to increase the power of the internal combustion engine 10 , a turbocharger 11 is associated with the internal combustion engine 10 . The exhaust gas of the internal combustion engine 10 is first guided through the sulfur adsorption device 12 in the exhaust system. A methane oxidation catalyst 13 is arranged downstream of the sulfur adsorption device 12 , wherein oxidation of methane contained in the exhaust gas takes place in the methane oxidation catalyst 13 . The upstream sulfur adsorption device 12 achieves that the methane oxidation function is not impaired or deteriorated due t...

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Abstract

In a method for monitoring a methane oxidation catalyst (13) in an exhaust gas aftertreatment system of an internal combustion engine (10), at least one for liquid state is arranged upstream of the methane oxidation catalyst (13) in the exhaust gas aftertreatment system fuel injection device (17). In the monitoring method, liquid fuel is injected via the injection device ( 17 ) in a first step. The characteristics of the methane oxidation catalyst (13) with respect to liquid fuels were observed. Preferably, in the second step of the method, from the properties of the methane oxidation catalyst with respect to liquid fuels and the properties of the methane oxidation catalyst with respect to methane conversion, it is possible to infer, for example, a possible deterioration in the activity of the methane oxidation catalyst with the aid of comparative values. .

Description

technical field [0001] The invention relates to a method for monitoring a methane oxidation catalyst in an exhaust gas aftertreatment system of an internal combustion engine, wherein at least one injection device for fuel is arranged upstream of the methane oxidation catalyst. Background technique [0002] Internal combustion engines are known which can be operated both with methane-containing gases, such as natural gas or methane, and with mixtures of gas and other fuels, such as diesel fuel. [0003] Purely gas engines are often derived from gasoline or diesel engines, where the external ignition for igniting the gas / air mixture usually takes place by means of spark plugs. In the case of diesel / gas engines, the engine is basically based on a diesel engine, which allows both pure diesel operation and mixed operation with diesel fuel and gas. Here, part of the calorific value of diesel is replaced by gas. The ignition of the total fuel, that is to say the diesel-gas / air mi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00F01N3/20
CPCF01N3/2033F01N11/00F01N2550/02F01N2900/18F01N3/035F01N3/085F01N3/103F01N3/2066F01N3/36F01N2560/025F01N2560/06F01N2560/14F01N2900/0412F01N2900/1602F01N2900/1621Y02T10/12Y02T10/40
Inventor M.格勒克勒W.克里斯特尔
Owner ROBERT BOSCH GMBH