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Method and system for engine aftertreatment system

A technology for engine and exhaust after-treatment, applied in engine components, combustion engines, machines/engines, etc., to solve problems such as the degradation of the ability to capture NOx and the increase of atmospheric emissions

Active Publication Date: 2017-11-03
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the LNT degrades over time, the ability to trap NOx will degrade while causing an increase in atmospheric emissions

Method used

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  • Method and system for engine aftertreatment system
  • Method and system for engine aftertreatment system
  • Method and system for engine aftertreatment system

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Embodiment Construction

[0037] The following description relates to systems and methods for diagnostics of exhaust aftertreatment systems. An example engine system including an exhaust aftertreatment system is in figure 1 shown in . including the first lean NO x trap (LNT) and second lean NO x The details of the exhaust aftertreatment system of the trap are in figure 2 shown in . A block diagram of a treatment system monitor for monitoring diagnostics of an engine exhaust aftertreatment system is at image 3 shown in . The engine controller can be configured to execute control programs such as Figure 4 , Figure 5 with Image 6 An example procedure for diagnosing each of the first LNT and the second LNT of the exhaust aftertreatment system. An example plot of air-fuel ratio estimated upstream and downstream of the first LNT during regeneration of the first LNT is at Figure 7 shown in .

[0038] figure 1 Aspects of an example engine system 100 including engine 10 are schematically shown...

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Abstract

The invention relates to a method for monitoring an engine exhaust aftertreatment system that includes more than one lean NOx trap (LNT) and a processing system monitor. The method includes receiving an exhaust gas with a desired air-fuel ratio at the upstream of the corresponding LNT; further regenerating the by using an air-fuel ratio rich in stoichiometric exhaust gas and then evaluating the air-fuel ratio received at the downstream of the LNT. In addition, based on the monitoring of the air-fuel ratio and the oxygen content at the upstream and the downstream of the LNT, the operation state of the corresponding LNT is determined.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Indian Patent Application No. 201641014703 filed on April 27, 2016. The entire contents of the aforementioned applications are incorporated herein by reference in their entirety for all purposes. technical field [0003] This specification as a whole refers to methods for including multiple lean NO x Systems and methods for diagnostics of an exhaust aftertreatment system of a trap. Background technique [0004] Internal combustion (IC) engines are often coupled to emission control devices to reduce combustion by-products such as carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO x ). For lean engine operation of IC engines, lean NO x A trap (LNT) may be coupled to the emission control device. During lean operation, LNT stores such as oxygen and NO x exhaust components. When NO stored in LNT x When the amount exceeds a predetermined threshold, LNT occurs also kn...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N11/00F01N13/00F01N3/20
CPCF01N3/20F01N3/206F01N9/00F01N11/007F01N2260/04F01N2610/03F01N13/0093F01N13/0097F01N3/0814F01N3/0842F01N11/00F01N2430/06F01N2550/03F01N2560/025F01N2900/1402Y02T10/12Y02T10/40
Inventor F·D·斯迈特C·博任森F·林森
Owner FORD GLOBAL TECH LLC