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System and method for exhaust gas aftertreatment of internal combustion engine

A technology of exhaust gas post-treatment and internal combustion engine, which is applied in the direction of electronic control of exhaust gas treatment device, exhaust gas treatment, internal combustion piston engine, etc. It can solve the problems of aging and strong coating, achieve good heat transfer, reduce flow resistance, reduce The effect of exhaust back pressure

Active Publication Date: 2020-02-21
VOLKSWAGEN AG
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  • Abstract
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Problems solved by technology

A further problem in the case of three-way catalytic converters with coatings acting as three-way catalysis, so-called four-way catalytic converters, lies in the fact that the coatings can have strong aging phenomena, which can be detrimental to the gaseous In terms of material conversion, an additional three-way catalytic converter may be required in a position close to the engine

Method used

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  • System and method for exhaust gas aftertreatment of internal combustion engine
  • System and method for exhaust gas aftertreatment of internal combustion engine
  • System and method for exhaust gas aftertreatment of internal combustion engine

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Embodiment Construction

[0027] figure 1 A schematic diagram of an internal combustion engine 10 is shown, the outlet 12 of which is connected to an exhaust system 20 . The internal combustion engine 10 is designed as an Alto engine, which is externally ignited by means of spark plugs 16 and has a plurality of combustion chambers 14 . The internal combustion engine 10 is preferably embodied as an internal combustion engine 10 supercharged by means of an exhaust gas turbocharger 30 , wherein the turbine 32 of the exhaust gas turbocharger 30 is downstream of the outlet 12 and upstream of a first emission-reducing exhaust gas aftertreatment component, In particular, it is arranged upstream of the particle filter 24 . The exhaust gas system 20 comprises an exhaust gas duct 22 in which a particle filter 24 is arranged in the flow direction of the exhaust gas through the exhaust gas channel 22 , an electrically heatable three-way catalytic converter 26 is arranged downstream of the particle filter 24 and f...

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Abstract

The invention relates to an exhaust gas aftertreatment system for an internal combustion engine (10), in particular for an internal combustion engine (10) which is charged by means of a turbocharger (30) and spark-ignited by means of spark plugs (16). A particulate filter (24) and an electrically heatable three-way catalytic converter (26) downstream of the particulate filter (24) are arranged ina position close to the engine in an exhaust gas system (20) connected to an outlet (12) of the internal combustion engine (10). A further three-way catalytic converter (28) is arranged in the underbody position of the motor vehicle downstream of the electrically heatable catalytic converter (26). According to the invention, the electrically heatable three-way catalytic converter (26) is heated electrically after engine start, and the particulate filter (24), the electrically heatable three-way catalytic converter (26) and the further three-way catalytic converter are additionally heated by the exhaust gas flow from the internal combustion engine (10). The electric heating of the electrically heatable three-way catalytic converter (26) is switched off when the electrically heatable three-way catalytic converter (26) has reached its light-off temperature.

Description

technical field [0001] The invention relates to an exhaust gas aftertreatment system for an internal combustion engine and a method for exhaust gas aftertreatment of an internal combustion engine according to the preambles of the independent patent claims. Background technique [0002] The continuous increase in exhaust gas regulations places high demands on vehicle manufacturers, which are met by appropriate measures for reducing untreated engine emissions and by appropriate exhaust gas aftertreatment. With the introduction of regulation level EU6, limit values ​​for particle counts are prescribed for Otto motors, which in many cases necessitate the use of Otto particle filters. Such soot particles are formed in particular after a cold start of the internal combustion engine due to incomplete combustion combined with an overstoichiometric combustion air ratio and cold cylinder walls during the cold start. The cold start phase is thus decisive for compliance with the legall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/021F01N3/10F01N3/20F01N3/22F01N3/30F01N3/34F01N5/04F01N9/00F01N13/00
CPCF01N3/101F01N3/2013F01N3/2026F01N3/22F01N3/30F01N3/34F01N5/04F01N9/00F01N3/021F01N2240/16F01N2250/02F01N2260/08F01N2270/04F01N2330/02F01N2340/02F01N2340/04F01N2340/06F01N2560/025F01N2560/14F01N2900/1602F01N2900/1626F01N2900/1804F01N13/0093F01N13/009Y02A50/20Y02T10/12Y02T10/40F01N9/002F01N2430/06
Inventor S.保克纳F-C.巴龙冯丘默恩-林登斯杰纳
Owner VOLKSWAGEN AG
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