Apparatus, method, and system for diagnosing reductant deposits in an exhaust aftertreatment system

A technology for exhaust after-treatment and reducing agent, which is applied in the direction of electronic control of exhaust treatment devices, exhaust devices, exhaust treatment, etc., can solve the problem of NOx reduction efficiency, operational performance impact, and engine exhaust after-treatment system hindering operation. And other issues

Active Publication Date: 2014-09-03
CUMMINS INTPROP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such deposits can adversely affect the operation of the engine (e.g. restricting the exhaust flow path) and the exhaust aftertreatment system (e.g. hampering catalytic reactions)
Engines may not run properly if deposits are not detected and removed quickly
For example, reductant deposits can negatively impact fuel consumption, NOx reduction efficiency, and other operational performance of internal combustion engines

Method used

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  • Apparatus, method, and system for diagnosing reductant deposits in an exhaust aftertreatment system
  • Apparatus, method, and system for diagnosing reductant deposits in an exhaust aftertreatment system
  • Apparatus, method, and system for diagnosing reductant deposits in an exhaust aftertreatment system

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Embodiment Construction

[0035] figure 1 One embodiment of an internal combustion engine system 10 is shown. Major components of the system 10 include an internal combustion engine 20 and an exhaust aftertreatment system, which may include a selective catalytic reduction (SCR) system 18 . The SCR system 18 includes a decomposition or reaction chamber 22 in which catalytic processing occurs. Reaction chamber 22 may communicate with internal combustion engine 20 , receiving exhaust gas via exhaust line 24 . The reaction chamber 22 may include any of a variety of catalysts, such as an SCR catalyst, and is configured to reduce nitrogen oxides in the presence of ammonia, which may be obtained from the reduction of a reducing agent, such as aqueous urea.

[0036] The internal combustion engine 20 may be a compression ignition engine, such as a diesel fueled engine, or a spark ignited internal combustion engine, such as a gasoline fueled engine operated on a tilt. Fuel and air are combusted within a compr...

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Abstract

An exhaust gas treatment system for an internal combustion engine has a reluctant delivery system that delivers reductant to an exhaust stream in an exhaust aftertreatment system. A temperature sensor is positioned in or near the flow of reductant and exhaust to measure the temperature of the reluctant and exhaust. A change in temperature over time, such as an increase, decrease, or change in variation amplitude, indicates the presence of a reductant deposit in the system. Detection of the deposit initiates a regeneration cycle in which the operating characteristic of the system change to eliminate the reductant deposit to present it front hindering the performance of the exhaust aftertreatment system.

Description

technical field [0001] The present invention relates to internal combustion engines, and more particularly to diagnosing the operation of a reductant delivery system for treating exhaust gas in an exhaust aftertreatment system. Background technique [0002] In recent years, emission regulations for internal combustion engines have become more stringent. Concern for the environment has led to stricter emission regulations for internal combustion engines in most parts of the world. Government agencies, such as the Environmental Protection Agency (EPA) in the United States, carefully monitor engine emissions and set appropriate emission standards with which all engines must comply. As a result, exhaust aftertreatment systems are increasingly being used on engines to reduce emissions. [0003] In general, emission regulations vary depending on the type of engine. Emissions tests for compression ignition (e.g. diesel) engines typically measure released carbon monoxide (CO), un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF01N2610/03F01N9/00F01N2900/1404F01N2550/05F01N2560/06F01N11/002F01N2610/02F01N3/2066F01N2610/148Y02T10/12Y02T10/40F02D41/027
Inventor D·A·米切尔A·W·奥斯本J·德罗斯特J·F·伯克J·M·布罗
Owner CUMMINS INTPROP INC
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