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Method for monitoring methane oxidation catalyst

A methane oxidation and catalyst technology, which is applied to the electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, exhaust gas treatment, etc. Temperature characteristics, etc.

Active Publication Date: 2016-06-29
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • 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 catalyst

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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 after-treatment system for an internal combustion engine (10), at least one injection device (17) for liquid fuel is arranged at the upstream of the methane oxidation catalyst (13) in the exhaust gas after-treatment system. In the monitoring method, a first step is to injecting liquid fuel through the injection device (17). The characteristics of the methane oxidation catalyst (13) with respect to the liquid fuel are observed. Preferably, in the second step of the method, the characteristics of the methane oxidation catalyst with respect to methane conversion can be concluded from the characteristics of the methane oxidation catalyst with respect to the liquid fuel, and thus the activity variation possibly present in the methane oxidation catalyst can be inferred, for instance, from a comparison value.

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 Applications(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