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Exhaust gas system and method of feeding fluid into exhaust gas passage of exhaust gas system

A technology of exhaust gas system and exhaust gas passage, applied in exhaust gas treatment, exhaust device, air quality improvement and other directions, can solve the problems of exhaust gas system blockage, adhesion, incomplete evaporation of reducing agent, etc.

Pending Publication Date: 2020-12-18
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it has been shown, especially at low temperatures, that there is a risk that a part of the reducing agent fed into the exhaust system does not evaporate completely and sticks, for example, to the boundaries of the mixing element and / or the exhaust system or the exhaust duct and Formation of deposits that may negatively affect the reduction of hazardous substances
This can lead, for example, to increased fuel consumption and / or increased emissions of pollutants
These deposits can even lead to clogging of the exhaust system

Method used

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  • Exhaust gas system and method of feeding fluid into exhaust gas passage of exhaust gas system
  • Exhaust gas system and method of feeding fluid into exhaust gas passage of exhaust gas system
  • Exhaust gas system and method of feeding fluid into exhaust gas passage of exhaust gas system

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Embodiment Construction

[0037] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0038] figure 1 Exhaust system 1 of internal combustion engine 25 is shown schematically. The exhaust system 1 comprises an exhaust gas duct 2 in which a diesel oxidation catalyst (DOC) 4 and an SCR catalyst 5 are arranged, wherein the DOC catalyst 4 is arranged upstream of the SCR catalyst 5 in the exhaust gas flow direction 3 . Between the DOC catalytic converter 4 and the SCR catalytic converter 5 two examples 100 , 200 of the arrangement of the mixing element 6 and the dosing module 7 are shown, which together are also referred to as mixing unit 8 . Usually, only one mixing unit 8 is arranged in the exhaust gas channel 2 . The illustration of the two examples 100 , 200 of the mixing unit 8 serves only to illustrate the different arrangement possibilities.

[0039] The arrangement example 100 provides that the metering module 7 feeds a fluid 9 , usually a urea-ba...

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Abstract

The invention relates to an exhaust gas system for an internal combustion engine, in particular for an internal combustion engine in a motor vehicle. The exhaust gas system has an exhaust gas passagewhich is provided for the exhaust gas of the internal combustion engine to flow through; a dosing module which is designed to feed a fluid, in particular a fluid reducing agent, into the exhaust gas passage; and a mixing element, which is designed to mix a fluid fed into the exhaust gas passage with exhaust gas flowing through the exhaust gas passage. The fed fluid impacts the mixing element at anunequal fluid impact density. The mixing element is arranged such that greater heat transfer from the exhaust gas flowing through the exhaust gas passage to the mixing element takes place in the region with a high fluid impact density than in the region with a lower fluid impact density. The invention further relates to a method for feeding a fluid, in particular a fluid reducing agent, into an exhaust gas passage of an exhaust gas system.

Description

technical field [0001] The invention relates to an exhaust gas system for an internal combustion engine, in particular for an internal combustion engine in a motor vehicle, wherein the exhaust gas system has an exhaust gas channel, a metering module and a mixing element. The exhaust gas channel is provided for the exhaust gas of the internal combustion engine to flow through. The dosing module is designed to feed a fluid, in particular a fluid reducing agent, into the exhaust gas channel. The mixing element is designed to mix the fluid fed into the exhaust gas channel with the exhaust gas flowing through the exhaust gas channel. Furthermore, the invention also relates to a method for feeding a fluid, in particular a fluid reducing agent, into an exhaust gas channel of an exhaust gas system according to the invention. Background technique [0002] In order to keep the air pollution caused by the emitted exhaust gases as low as possible, aftertreatment of the exhaust gases i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/10F01N3/28F01N3/20
CPCF01N3/10F01N3/28F01N3/2066F01N2610/02F01N2610/1453F01N13/009F01N2240/20F01N2900/14F01N2610/1433F01N2900/1411Y02T10/12Y02A50/20
Inventor B·达姆森
Owner ROBERT BOSCH GMBH