Apparatus, method and system for diagnosing reductant delivery performance

A technology of conveying system and reducing agent, which is applied in the direction of diagnosis device, exhaust device, muffler device of exhaust gas treatment device, etc., can solve the problems of low performance, blockage and failure to transmit reducing agent of the reducing agent conveying system.
CN104047692BActive Publication Date: 2018-02-06CUMMINS INTPROP INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CUMMINS INTPROP INC
Publication Date
2018-02-06

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Abstract

The present invention provides a device, method and system for diagnosing the performance of reductant delivery. An exhaust gas aftertreatment system for an internal combustion engine may have a reductant delivery system with a controller that performs a determination of the reductant delivery system Whether there is a staged diagnosis of blockage. The diagnostic process may include sampling first and second pressures at first and second operating conditions, respectively, and then comparing a first differential pressure between the first and second pressures to one or more threshold differential pressures to determine if system components such as dosing lines and injectors are at least partially clogged. If this test is inconclusive, it can be repeated at the third and fourth operating conditions to provide a second differential pressure. The offset between the first and second differential pressures can also be used to help diagnose where in the system a blockage is occurring.
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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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