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Internal combustion engine exhuast gas post treatment method and apparatus for executing same

A technology of exhaust gas post-treatment and internal combustion engine, which is applied in the direction of electric control of exhaust treatment devices, exhaust devices, exhaust treatment, etc., can solve the problems of not being reliably reached, and achieve good exhaust gas purification and rapid heating effects

Active Publication Date: 2017-02-22
VOLKSWAGEN AG
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  • Description
  • Claims
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Problems solved by technology

Disadvantageously, in the case of such a solution, the temperature necessary for the regeneration of the particle filter is also not reliably reached in weak load cycles, especially when the particle filter is installed under the motor vehicle is not reliably reached when in position

Method used

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  • Internal combustion engine exhuast gas post treatment method and apparatus for executing same
  • Internal combustion engine exhuast gas post treatment method and apparatus for executing same
  • Internal combustion engine exhuast gas post treatment method and apparatus for executing same

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Embodiment Construction

[0052] figure 1 A superchargeable externally ignited internal combustion engine 10 , preferably a turbocharged Otto engine, is shown with a fresh air duct 12 and an exhaust gas duct 20 . Arranged in the exhaust gas duct 20 in the flow direction of the exhaust gas of the internal combustion engine 10 is a turbine 26 which is connected via a drive shaft 36 to the compressor 14 in the fresh air duct 12 . Turbine 26 and compressor 14 are part of turbocharger 40 . Downstream of the turbine 26 , a three-way catalytic converter 22 is arranged in the exhaust gas duct 20 , preferably close to the engine. A bypass channel 38 , in particular a so-called wastegate, is formed on the turbine 26 , with which a partial flow of exhaust gas can be guided past the turbine 26 . The bypass channel 38 can be closed by a valve or valves (not shown). Downstream of the three-way catalytic converter 22 , a particle filter 24 is arranged in the exhaust gas duct 20 , which is preferably arranged in an...

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Abstract

The invention relates to a method and an apparatus for the exhaust gas post treatment of a combustion engine. The apparatus comprises an internal combustion engine comprising a fresh air duct and an exhaust gas duct. A compressor for compressing the fresh air is arranged in the fresh air duct and the downstream of the compressor is provided with a secondary air pipeline. A three-way catalytic converter is arranged in the exhaust gas duct. The downstream of the three-way catalytic converter is provided with a particle filter. The method comprises the following processes: determining a loading condition of the particulate filter, when the loading condition requires a regeneration of the particulate filter, raising the exhaust temperature to a regeneration temperature of the particulate filter by at least temporarily adjusting a mixture formation for the internal combustion engine to a combustion air ratio ([lambda]E <1) and at least simultaneously introducing secondary air into the exhaust gas channel upstream of the three-way catalytic converter, wherein the unburned hydrocarbons in the exhaust gas channel, the super stoichiometric mixing air ratio ([lambda]M> 1) is set in the exhaust gas channel before entry into the particle filter, so that soot is formed on the exhaust air mixture particle filter is oxidized by the oxygen excess.

Description

technical field [0001] The invention relates to a method for exhaust gas aftertreatment of a superchargeable externally ignited internal combustion engine and an exhaust gas aftertreatment device for carrying out such a method according to the subclaims. Background technique [0002] The continuous tightening of exhaust gas regulations places high demands on vehicle manufacturers, which are met by corresponding measures for reducing coarse engine emissions and by corresponding exhaust gas aftertreatment. With the introduction of the EU6 regulation class, limit values ​​for the number of particles are prescribed for gasoline engines, which in many cases necessitates the use of gasoline particle filters. During driving operation, such a gasoline particulate filter is loaded with soot. In order that the exhaust gas backpressure does not rise too strongly, the gasoline particulate filter has to be regenerated continuously or periodically. In order to carry out the thermal oxid...

Claims

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Application Information

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IPC IPC(8): F01N9/00F02B37/00
CPCF01N9/002F02B37/00F01N3/021F01N3/0236F01N3/0293F01N3/035F01N3/106F01N2240/36F01N2270/04F01N2340/06F01N2430/06F01N2430/08F01N2900/0422F01N2900/1402F01N2900/1602F01N2900/1606F01N2900/1626Y02T10/12Y02T10/40
Inventor S.保克纳L.施吕特M.蒂勒
Owner VOLKSWAGEN AG
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