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Method for limiting the ageing of a catalyst in a motor vehicle exhaust line

A technology for automobile exhaust gas and catalyst, which is applied in the direction of electronic control of exhaust gas treatment device, diagnosis device of exhaust gas treatment device, exhaust gas treatment, etc., and can solve the problem of no solution provided.

Inactive Publication Date: 2016-02-10
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] This document only takes into account the aging of the catalyst placed upstream of the particle filter, it does not provide any solution to reduce this aging

Method used

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  • Method for limiting the ageing of a catalyst in a motor vehicle exhaust line
  • Method for limiting the ageing of a catalyst in a motor vehicle exhaust line
  • Method for limiting the ageing of a catalyst in a motor vehicle exhaust line

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Embodiment Construction

[0030] In general, the particle filter is filled with particles, mainly soot particles, while the vehicle is in motion, and it should be regularly regenerated in order to eliminate the particles it carries by combustion.

[0031] The regeneration process consists in bringing the particle filter to very high temperatures. For this purpose, additional fuel injections, also known as post-injections, are carried out, which are completely invisible to the driver in the vehicle's exhaust line. These additional injections lead to a sudden increase in the temperature of the exhaust gas, ie a temperature rise upstream and in the filter. Due to this temperature rise, soot, mainly composed of carbon, is converted into carbon dioxide gas and water vapor, which are discharged through the exhaust line.

[0032] Subsequently, regeneration can only be started if the temperature upstream of or in the filter is sufficiently high. For an exhaust line comprising an oxidation catalyst placed ups...

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Abstract

The invention concerns a method for limiting the ageing of at least one catalyst in an exhaust line of a motor vehicle, said catalyst being located upstream of a particle filter, the temperature upstream of the filter being, during a regeneration, sufficient to burn the soot that it contains, said temperature being obtained by additional injections of fuel into the line during regeneration, characterized by the step of determining a temperature setpoint (PF Tupstream Setpoint) upstream from the filter and a dosing setpoint (Diesel Dosing Setpoint) for the additional injections of fuel, the two setpoints being determined on the basis of the distance travelled by the vehicle since a new catalyst was provided (Distance since new DOC) or a model of catalyst damage (DOC Damage Model) according to at least the estimated or measured temperature (estimated or measured Tintra DOC) of the catalyst.

Description

technical field [0001] The invention relates to a method for limiting the aging of at least one catalyst in the exhaust line of a motor vehicle, the catalyst or catalysts being an oxidation catalyst of carbon monoxide CO or hydrocarbons HC or a reduction catalyst of nitrogen oxides. This confinement method is achieved by the adaptation of the particle filter, which is advantageously saturated or non-saturated. Background technique [0002] Next, take the exhaust pipe of a diesel-type vehicle as an example. This example is not limiting, the car may also be a gasoline car, the catalyst is advantageously an oxidation catalyst, in particular a three-way catalyst. [0003] Such exhaust lines for driving gas pollution reduction are usually equipped with: [0004] - Diesel oxidation catalyst, hereinafter named as DOC catalyst, used to treat carbon monoxide CO or hydrocarbon HC, [0005] - optional nitrogen oxide aftertreatment devices downstream of the DOC catalyst, such as sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/10F01N9/00F01N3/025
CPCF01N3/0253F01N3/103F01N9/002F01N2550/02F01N2900/102F01N2900/1621Y02A50/20Y02T10/40
Inventor 塞巴斯蒂·福尔帕斯卡·福利奥
Owner PEZHO SITROEN AUTOMOBILS SA
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