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Exhaust gas after-treatment device and method for operating the same

A technology for exhaust post-treatment and inlet, which is applied in the direction of electronic control of exhaust treatment devices, exhaust devices, exhaust treatment, etc., and can solve problems such as the adverse effects of nitrogen oxide storage capacity

Inactive Publication Date: 2013-09-18
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With NO x Gradual aging of storage catalytic converters due to thermal deterioration and due to accumulated sulphates, NO x The storage capacity of the storage catalytic converter and its ability to convert stored nitrogen oxides are significantly adversely affected

Method used

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  • Exhaust gas after-treatment device and method for operating the same
  • Exhaust gas after-treatment device and method for operating the same
  • Exhaust gas after-treatment device and method for operating the same

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Embodiment Construction

[0026] figure 1 Schematically shows an exhaust aftertreatment device for treating the exhaust gas of an internal combustion engine, wherein the exhaust gas 5 arising from the internal combustion engine first flows through the NO x storage catalytic converter 10 and subsequently by setting the NO x An SCR catalytic converter 20 downstream of the storage catalytic converter 10 .

[0027] from figure 2 and image 3 It can be seen that NO x The effective storage capacity of the storage catalytic converter 10 increases with the NO x Gradual aging of storage catalytic converters (corresponding to image 3 The curves "1", "2" and "3") in the image 3 In the region of relatively low temperature indicated only schematically by "A" in the image 3 In the relatively high temperature region denoted by "B" in , the deterioration is mainly due to thermally induced aging.

[0028] Embodiments of the method according to the invention take into account said aging effects hereinafter w...

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Abstract

The method involves storing nitrogen oxide of exhaust gas supplied from an internal combustion engine, and selectively catalyzing and reducing the nitrogen oxide of the exhaust gas supplied to a silicon-controlled rectifier (SCR) catalytic converter. A regeneration stage is triggered based on a state variable value and state characteristic of an exhaust gas after-treatment device. The regeneration stage is triggered by selectively considering a standard state variable based on an aging state of a nitrogen oxide storage catalytic converter. An independent claim is also included for an exhaust gas after-treatment device comprising a nitrogen oxide storage catalytic converter and a silicon-controlled rectifier (SCR) catalytic converter.

Description

technical field [0001] The invention relates to an exhaust aftertreatment device and a method of operating an exhaust aftertreatment device. Background technique [0002] The method according to the invention is used in an exhaust gas aftertreatment device with NO x A storage catalytic converter (also known as a NOx trap for lean air-fuel operation, or LNT for short, "lean NOx x trap) and the SCR catalytic converter, which is periodically subjected to operating phases using a rich air-fuel ratio in order to promote NO x Stores the regeneration of the catalytic converter. [0003] NO x The storage catalytic converter absorbs and stores nitrogen oxides (NO x ). Once NO x Store NO in the catalytic converter x Saturation of the molecules necessitates the use of a rich operating phase (rich operation typically lasts a few seconds) to clean the NO x Store catalytic converters. At this time, it is allowed to store the NO x The release and reduction of molecules form non-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N3/28B01D53/94B01D53/56
CPCF01N9/00Y02T10/24F01N3/0814F01N13/02Y02T10/47F01N3/2066F01N2570/14F01N13/009Y02A50/20Y02T10/12Y02T10/40
Inventor 亚西尔·雅各布
Owner FORD GLOBAL TECH LLC