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Method for reducing particle emissions during cold start of an internal combustion engine

An internal combustion engine, cold start technology, applied to internal combustion piston engines, combustion engines, machines/engines, etc., can solve problems such as cost and reduce cold start emissions

Active Publication Date: 2021-12-03
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the measures described are mostly only achievable with great effort and are therefore mostly cost-intensive

Method used

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  • Method for reducing particle emissions during cold start of an internal combustion engine
  • Method for reducing particle emissions during cold start of an internal combustion engine

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Embodiment Construction

[0064] figure 1 An externally ignited internal combustion engine 10 for a motor vehicle 80 is shown with an exhaust system 20 in which a particle filter 22 and a three-way catalytic converter 26 are arranged. In addition to the three-way catalytic converter 14 , further catalytic converters and exhaust gas aftertreatment devices, in particular a NOx storage catalytic converter 28 , can be arranged in the exhaust gas system. The particle filter 22 can have a coating effective in the manner of three-way catalysis and be configured as a so-called four-way catalytic converter 24 , wherein the particle filter 22 in this case combines the functions of the three-way catalytic converter 26 and the particle filter 22 concentrated in one component. The internal combustion engine 10 is supplied with fresh air via an air supply system 60 . In this case, an air filter 62 and an air mass sensor 64 are arranged in the intake line 58 of the internal combustion engine 10 . The fresh air can...

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Abstract

The invention relates to a method for reducing particle emissions during a cold start of an internal combustion engine, in particular to a method for reducing particle emissions of an internal combustion engine (10) in the event of a cold start of the internal combustion engine (10). In this case, at least one combustion chamber (12) of the internal combustion engine (10) is switched off during a cold start phase of the internal combustion engine (10), so that only air is compressed in this switched off combustion chamber. A better gasification of the fuel in the combustion chamber (12) is achieved by compression of the work combustion chamber heating. Arranged so that the initially switched off combustion chamber (12) is switched on when the cylinder walls of the combustion chamber (12) have reached a sufficient temperature so that the formation of soot due to impingement of unburned fuel on the cold cylinder walls is reduced .

Description

technical field [0001] The invention relates to a method for reducing particle emissions of an internal combustion engine, in particular an Otto engine, during a cold start of the internal combustion engine, and to a control unit for carrying out such a method. Background technique [0002] The continuous tightening of exhaust gas regulations places high demands on vehicle manufacturers, which requirements are met by corresponding measures for reducing untreated emissions of engines and by corresponding exhaust gas aftertreatment. With the introduction of regulatory class Euro 6 (EU6), limit values ​​for the number of particles are prescribed for gasoline engines, which in many cases necessitate the use of gasoline particle filters. Such soot particles are especially after a cold start of the internal combustion engine due to incomplete combustion combined with an overstoichiometric combustion air ratio (Verbrennungsluftverhältnis, sometimes called excess air ratio) after a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/023F01N9/00
CPCF01N3/023F01N9/002F01N3/101F01N9/00F01N2430/08F02D17/02F02D35/026F02D41/0087F02D41/029F02D41/064F02D41/3836F02D2200/021F02D2250/38Y02T10/12Y02T10/40
Inventor D.苏德沙耶夫G.施罗特
Owner VOLKSWAGEN AG