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Apparatus, method, and system for diagnosing reductant delivery performance

A transmission system and reducing agent technology, which is applied to the diagnosis device, exhaust device, silencer device, etc. of the exhaust treatment device, and can solve the problems of low performance of the reducing agent delivery system, failure to deliver the reducing agent, blockage, etc.

Active Publication Date: 2014-09-17
CUMMINS INTPROP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A known indication of SCR systems failing to convert DOG NOx is the failure to deliver the required amount of reductant for NOx conversion due to a blockage within the reductant delivery system
Known systems and associated diagnostics fail to adequately diagnose poor performance of the reductant delivery system due to clogging or other failures and therefore fail to meet OBD requirements considering failure of the reductant delivery system

Method used

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  • Apparatus, method, and system for diagnosing reductant delivery performance
  • Apparatus, method, and system for diagnosing reductant delivery performance
  • Apparatus, method, and system for diagnosing reductant delivery performance

Examples

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Embodiment Construction

[0038] figure 1 One embodiment of an engine system 10 is shown. The major components of engine system 10 include internal combustion engine 20 and an exhaust aftertreatment system, which may be in the form of a selective catalytic reduction (SCR) system 18 including a catalytic chamber 22 in communication with internal combustion engine 20 And exhaust gas is received through exhaust manifold 24 . The SCR catalyst chamber 22 includes an SCR catalyst configured to interact with the exhaust gas and reduce NOx in the presence of ammonia. 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 compression chamber of the internal combustion engine 20 to provide exhaust gas that is discharged into an exhaust manifold 24 . At least a portion of the exhaust flow flows from exhaust manifold 24 into or t...

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Abstract

An exhaust gas treatment system for an internal combustion engine may have a reductant delivery system with a controller that performs period diagnostics to determine whether there is a blockage in the reductant delivery system. The diagnostic procedure may include sampling first and second pressures at first and second operating conditions, respectively, and then comparing the first pressure differential between the first and second pressures with one or more threshold pressure differentials to determine whether system components such as a dosing line and an injector are at least partially blocked. If such a test is not conclusive, it may be repeated at a third and fourth operating conditions to provide a second pressure differential. The offset between the first and second pressure differentials may also be used to help diagnose where a blockage in the system resides.

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 exhaust aftertreatment. 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), unburned hydrocarbons (UHC), engine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF01N2610/03F01N2550/00F01N2900/1808F01N2550/05F01N2900/0412F01N3/208F01N11/00F01N2610/02F01N2900/1812Y02A50/20Y02T10/12Y02T10/40
Inventor D·S·埃弗拉德R·斯塔斯
Owner CUMMINS INTPROP INC
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