Invention Grant
- Patent Title: Nitrogen dioxide generation diagnostic for a diesel after-treatment system
- Patent Title (中): 柴油后处理系统的二氧化氮生成诊断
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Application No.: US13442924Application Date: 2012-04-10
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Publication No.: US08984867B2Publication Date: 2015-03-24
- Inventor: Igor Anilovich , John Coppola , Janean E. Kowalkowski , John F. Van Gilder , Ognyan N. Yanakiev
- Applicant: Igor Anilovich , John Coppola , Janean E. Kowalkowski , John F. Van Gilder , Ognyan N. Yanakiev
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Agency: Quinn Law Group, PLLC
- Main IPC: F01N3/20
- IPC: F01N3/20 ; F01N3/021 ; F01N3/10 ; F01N11/00 ; F01N13/02
Abstract:
A method for assessing NO2 generation efficiency in a diesel engine after-treatment (AT) system having a diesel oxidation catalyst (DOC) downstream of the engine generating the NO2 and a selective catalytic reduction (SCR) catalyst downstream of the DOC converting NOX with the aid of the NO2. Engine exhaust gas flow is passed into the AT system and a reductant is injected into the gas flow between the DOC and the SCR catalyst. SCR inlet gas flow temperature is monitored during transient engine operation and DOC inlet and SCR catalyst outlet NOX concentrations are detected when the SCR catalyst inlet gas flow temperature is in a predetermined range. SCR catalyst NOX conversion efficiency is determined using the detected DOC inlet and SCR catalyst outlet concentrations of NOX. Additionally, whether the NO2 generation efficiency is at or above threshold efficiency is assessed by comparing the determined and threshold NOX conversion efficiencies.
Public/Granted literature
- US20130263591A1 NITROGEN DIOXIDE GENERATION DIAGNOSTIC FOR A DIESEL AFTER-TREATMENT SYSTEM Public/Granted day:2013-10-10
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