Nucleation Mode Formation in Heavy-Duty Diesel Exhaust with and without a Particulate Filter

2004 ◽  
Vol 38 (18) ◽  
pp. 4884-4890 ◽  
Author(s):  
Kati Vaaraslahti ◽  
Annele Virtanen ◽  
Jyrki Ristimäki ◽  
Jorma Keskinen
Keyword(s):  
Diesel Exhaust ◽  
Particulate Filter ◽  
Heavy Duty ◽  
Nucleation Mode ◽  
Heavy Duty Diesel ◽  
Mode Formation

Speciation of Heavy Duty Diesel Exhaust Emissions under Steady State Operating Conditions

1996 ◽  
Author(s):  
Mridul Gautam ◽  
Deepak Gupta ◽  
Laila EI-Gazzar ◽  
Donald W. Lyons ◽  
Sriram Popuri
Keyword(s):  
Steady State ◽  
Diesel Exhaust ◽  
Exhaust Emissions ◽  
Operating Conditions ◽  
Heavy Duty ◽  
Heavy Duty Diesel

Development of an Open Loop Fuzzy Logic Urea Dosage Controller for Use With an SCR Equipped HDD Engine

2009 ◽  
Author(s):  
Raffaello Ardanese ◽  
Michelangelo Ardanese ◽  
Marc C. Besch ◽  
Theodore Adams ◽  
Arvind Thiruvengadam ◽  
...  
Keyword(s):  
Fuzzy Logic ◽  
Catalytic Reduction ◽  
Control Strategies ◽  
Open Loop ◽  
Particulate Filter ◽  
Oxides Of Nitrogen ◽  
Heavy Duty ◽  
Ammonia Slip ◽  
Fuzzy Logic Approach ◽  
Heavy Duty Diesel

Selective Catalytic Reduction (SCR) systems have been shown to be the most promising exhaust aftertreatment system for near term in-use applications to meet the stringent US 2010 oxides of nitrogen (NOx) emissions regulations of 0.2 g/bhp-hr for on-highway heavy duty diesel engines. SCR systems use the ammonia-containing compound urea, as a reducing agent. In order to control the urea dosage during transient operation of the engine, sophisticated control strategies are needed. This study discusses the development of an open loop, non-sensor based fuzzy logic urea dosage controller. The goal of the fuzzy logic based control was to achieve maximum NOx emission reduction, while limiting the amount of ammonia slip. The open loop controller was implemented on a heavy duty diesel engine equipped with a catalyzed diesel particulate filter (DPF) and a SCR system. The control system was quantified by operating the engine over different test cycles on an engine dynamometer. This study shows that the fuzzy logic approach is a simple and effective way to control NOx, as well as ammonia slip.

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