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Method for treating contaminants using three-way catalyst when starting internal combustion engine

A technology for internal combustion engines and pollutants, which is applied to engine components, internal combustion piston engines, exhaust gas treatment, etc. It can solve the problems of low hydrocarbon processing capacity, inability to provide pollution reduction, and does not provide for adjusting the amount of oxygen in the catalytic converter, so as to achieve pollution The effect of volume reduction

Pending Publication Date: 2022-06-21
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it has been found that this solution does not provide a satisfactory reduction in pollution as it does not provide a means of regulating the amount of oxygen in the catalyst
So right after the engine starts, it may have lower hydrocarbon handling capacity due to lack of oxygen, even at high temperatures

Method used

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  • Method for treating contaminants using three-way catalyst when starting internal combustion engine
  • Method for treating contaminants using three-way catalyst when starting internal combustion engine
  • Method for treating contaminants using three-way catalyst when starting internal combustion engine

Examples

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Embodiment Construction

[0023] see figure 1 , which shows an embodiment of a system for the treatment of pollutants emitted by a vehicle having an internal combustion engine 1 with a catalytic device 3 arranged after the exhaust gas 4 discharged from the engine 1 .

[0024] The catalytic converter 3 comprises a three-way catalytic converter 3 provided with a so-called "precious" metal, such as palladium, platinum or rhodium. The three-way catalytic converter 3 is intended to treat the exhaust gas leaving the exhaust pipe 6 with three parallel chemical reactions of oxidation of carbon monoxide, oxidation of hydrocarbons and reduction of nitrogen oxides.

[0025] Multiple catalysts can be provided in series.

[0026] The catalyst 3 comprises an impregnated surface (referred to as a "washcoat") containing compounds based on ceria, which are capable of storing or releasing oxygen very quickly to facilitate catalytic reactions.

[0027] Catalyst 3 is only effective above about four hundred degrees Celsi...

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PUM

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Abstract

The invention relates to a method for treating contaminants emitted by a vehicle having a heat engine, in which a catalytic device (3) is heated, characterized in that the amount of oxygen (OS) in the catalytic device (3) is controlled to exceed a minimum amount of oxygen (OS1) by injecting air upstream of the catalytic device (3).

Description

technical field [0001] The present invention relates to the field of catalytic converters designed to treat the exhaust gases of internal combustion engines, in particular from vehicles, in order to reduce pollutants such as carbon monoxide, nitrogen oxides or unburned hydrocarbons when the engine is started Emissions of ingredients. Background technique [0002] In order for the catalytic converter to effectively handle these pollutant emissions in the exhaust gas, the temperature of the catalytic converter needs to be above a threshold lightoff temperature, which is typically performed by using the exhaust gas passing through the catalytic converter to heat the catalytic converter. heating to achieve. [0003] It may take longer for the catalytic converter to reach this temperature. This results in the emission of large quantities of untreated gas containing pollutants that may be too high, either relative to current standards or relative to voluntary accepted targets be...

Claims

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Application Information

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IPC IPC(8): F01N3/10F01N3/20F01N3/22
CPCF01N3/101F01N3/103F01N3/106F01N3/2006F01N3/2013F01N3/22F01N2900/1602F01N2900/1402F01N2240/16F01N2900/1626Y02A50/20Y02T10/12F01N3/20
Inventor 凯茜·巴蒂松布鲁诺·佩雷西尼
Owner NISSAN MOTOR CO LTD
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