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Method for diagnosing an exhaust gas system of an internal combustion engine

A technology for exhaust devices and internal combustion engines, which is applied in the direction of exhaust devices, electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, etc., can solve the problems of high consumption of internal combustion engines and poor emission values.

Active Publication Date: 2018-02-06
AUDI AG
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Since the examination of the exhaust system requires both the rich and lean operating states of the corresponding internal combustion engine, failure to diagnose the exhaust system on the basis of the operating point of the internal combustion engine usually results in higher consumption and Correspondingly lead to worse emission values

Method used

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  • Method for diagnosing an exhaust gas system of an internal combustion engine
  • Method for diagnosing an exhaust gas system of an internal combustion engine
  • Method for diagnosing an exhaust gas system of an internal combustion engine

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Embodiment Construction

[0054] The drawings are described in relation to each other and across each other. The same reference numbers refer to the same features.

[0055] figure 1 shows an exhaust system 1 which has an exhaust pipe 3 which is connected to an internal combustion engine. An internal combustion engine, not shown, produces exhaust gases which flow through the exhaust pipe 3 in the flow direction indicated by the arrow 5 . On its way through the exhaust pipe 3 the exhaust gas first flows around a linear exhaust gas sensor 7 which detects the composition of the exhaust gas or the proportion of fuel in the exhaust gas. After the linear exhaust gas sensor 7 , the exhaust gas flows through the three-way catalytic converter 9 and then the binary lambda sensor 11 , wherein the binary lambda sensor 11 can also be integrated into the three-way catalytic converter 9 .

[0056] On the exhaust gas path in the direction of the exhaust muffler, the exhaust gas continues to flow through a four-way c...

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Abstract

The present invention relates to a method for diagnosing an exhaust gas system of an internal combustion engine with at least one three-way catalytic converter, at least one four-way catalytic converter and at least one binary lambda sensor, wherein during the testing of the functional operability of the at least one binary lambda sensor and / or of at least one four-way catalytic converter on the basis of a lambda change with a changeover of the internal combustion engine from a lean operation to a rich operation following a thrust operation clearing out at least one three-way catalytic converter occurs.

Description

technical field [0001] The invention relates to a method for diagnosing at least a part of an exhaust system of an internal combustion engine and to an exhaust system. Background technique [0002] Exhaust gases generated during operation of the internal combustion engine must be post-treated by means of an exhaust system in order to comply with predetermined environmental regulations, such as exhaust gas limit values, during operation of the internal combustion engine. In this case, the exhaust gas aftertreatment takes place as a function of the performance of corresponding components of the exhaust system, for example a catalytic converter or a lambda sensor. Due to strict exhaust gas limit values ​​worldwide, the requirements for the diagnosis and operation of exhaust systems are constantly increasing. [0003] Since the examination of the exhaust system requires both the rich and lean operating states of the corresponding internal combustion engine, failure to diagnose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/28F01N9/00F01N13/00
CPCF01N3/28F01N9/00F01N11/00F01N11/007F01N2430/06F01N2560/025F01N13/0093F01N3/035F01N3/101F01N2550/04F01N2560/14F01N2900/0422F01N2900/08F01N2900/1402F02D41/1441F02D41/1454F02D41/1495F02D41/222F01N13/009Y02T10/12Y02T10/40
Inventor B·奥登达尔
Owner AUDI AG
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