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Assembly and Method for Introducing a Reducing Agent into the Exhaust Pipe of an Exhaust System of an Internal Combustion Engine

a technology of exhaust system and reducing agent, which is applied in the direction of machines/engines, mechanical equipment, membrane technology, etc., can solve the problem of complete blockage of the exhaust pip

Inactive Publication Date: 2010-08-26
FAURECIA EMISSIONS CONTROL TECH GERMANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a device and method for introducing a reducing agent into the exhaust system of an internal combustion engine. The device includes a feed connector, a feed device, and a device for generating a gas flow that is additional to the reducing agent flow. The gas flow lines the wall of the feed connector and prevents any mist of the reducing agent from depositing on the walls of the feed connector and exhaust pipe. The method involves injecting the reducing agent with the feed device and using a mixing element to cause a swirl flow in the exhaust pipe. The invention prevents reducing agent deposits and improves the mixing of the reducing agent with the exhaust gas flow.

Problems solved by technology

This is a problem, in particular for low-load, low-temperature operation of the internal combustion engine, in which the deposits are not vaporized again and may eventually completely block the exhaust pipe.

Method used

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  • Assembly and Method for Introducing a Reducing Agent into the Exhaust Pipe of an Exhaust System of an Internal Combustion Engine
  • Assembly and Method for Introducing a Reducing Agent into the Exhaust Pipe of an Exhaust System of an Internal Combustion Engine
  • Assembly and Method for Introducing a Reducing Agent into the Exhaust Pipe of an Exhaust System of an Internal Combustion Engine

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Embodiment Construction

[0038]FIG. 1 schematically shows an assembly 10 that introduces a reducing agent into an exhaust pipe 12 of an exhaust system of an internal combustion engine. In particular, the exhaust system of a motor vehicle is involved. The exhaust gas flow in the exhaust pipe 12 is denoted by S. The assembly 10 includes a feed connector 14 which is of a substantially conical configuration and opens into the exhaust pipe 12, preferably at an angle a of between 20° and 70°, and in the example shown is approximately 55°. An inside wall of the feed connector 14 is identified by reference number 16.

[0039]A feed device 20 for reducing agents is arranged in a mount 18 provided at an end of the feed connector 14 that is opposite to the exhaust pipe 12. The feed device 20 opens into the feed connector 14 and is an injection valve, in this case a low-pressure fuel injection valve. The reducing agent preferably is an aqueous urea solution which is introduced into the exhaust pipe 12 upstream of an SCR c...

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Abstract

An assembly and method for introducing a reducing agent into an exhaust pipe of an exhaust system of an internal combustion engine, in particular of a motor vehicle includes a feed connector which opens into the exhaust pipe and has a wall; a feed device for reducing agents which opens into the feed connector; and a device that generates a gas flow which is additional to the reducing agent flow and lines the wall of the feed connector.

Description

RELATED APPLICATION[0001]This application is the U.S. national phase application of PCT / EP2008 / 005170, filed 25 Jun. 2008, which claims priority to German Application Serial No. 10 2007 034 316.9, filed 24 Jul. 2007, and German Application Serial No. 20 2008 001 547.2, filed 4 Feb. 2008.BACKGROUND OF THE INVENTION[0002]The present invention relates to an assembly for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine, in particular of a motor vehicle. The present invention further relates to a method of introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine, in particular of a motor vehicle.[0003]To comply with specifications relating to environmental laws, exhaust gases such as those of motor vehicles driven by internal combustion engines need to be subjected to a purification. In particular, for nitrogen oxide reduction, so-called “SCR catalytic converters” (also referred to as ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01N3/20
CPCB01D2251/206B01D2259/12F01N3/2066F01N13/08Y02T10/24F01N2260/022F01N2610/02F01N2610/08F01N2610/1453F01N2240/20Y02A50/20Y02T10/12F01N3/2892B01D2251/2062F01N3/206F01N2470/00
Inventor RUSCH, KLAUSKAISER, ROLFFORSTER, ERICH
Owner FAURECIA EMISSIONS CONTROL TECH GERMANY
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