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.
CN104047692AActive Publication Date: 2014-09-17CUMMINS INTPROP INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CUMMINS INTPROP INC
Publication Date
2014-09-17

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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.
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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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