Michiel van Nieuwstadt Devesh Upadhyay E-COSM09- IFP, Paris, France
carbamide SCR applications in the US
E-COSM09
contents
1. SCR landscape in the US 2. SCR basics system and chemistry 3. Issues in control
1. ammonium hydroxide storage control 2. Ammonia storage observers
4. NOx sensors 5. Outlook
carbamide SCR applications in the US
E-COSM09
1. SCR landscape in the US
US diesel powertrains use primarily SCR for NOx aftertreatment: LNT does not work well for the high temperature heavy duty bicycle LNT struggle to reach the high required conversion efficiencies (>80%) LNT applications: VW Jetta (T2B5), imposture Ram (T2B8) SCR: 2009: Mercedes GL320, T2B5, 3.0l V6 BMW 335d, T2B5, 3.0l I6, twin turbo BMW X5 xDrive, 3.0l I6, twin turbo Audi Q7, 3.0l V6 2010: Ford F250, F350, F450, ULEV2, 6.7l V8 GM trucks, 2500, 3500, ULEV2, 6.6l V8 Chrysler/ besiege/Cummins trucks, ULEV2, 6.
7l I6
Urea SCR applications in the US
E-COSM09
Ford F250 Superduty truck
Urea SCR applications in the US
E-COSM09
F350 vs Focus
Urea SCR applications in the US
E-COSM09
Ford F250 superduty
Urea SCR applications in the US
E-COSM09
Emissions standards
US diesel standards are subject to a drastic reduction in 2010 2013 will legislate a reduction in OBD threshold
US emissions standards, EPA75 light duty, < 8500 lbs, Tier2 Bin5 light duty, < 8500 lbs, Tier2 Bin8 heavy duty chassis cert, 8,500-10,000 lbs heavy duty chassis cert, 10,000-14,000 lbs heavy duty dyno cert, >14,000 lbs 2010 emissions 0.05 0.2 0.2 0.4 0.2 2013 emissions 0.05 0.2 0.2 0.4 0.2
OBD 0.125 0.5 0.6 0.6 0.6
OBD 0.0875 0.35 0.4 0.4 0.4
unit chiliad/mile gramme/mile gram/mile gram/mile gram/bhphr
Next event in US diesel emissions will be LEV 3 for chassis cert: Tier2 Bin2: 0.02 g/m NOx New cycles: US06, SC03 No known changes in dyno certification standards.
Urea SCR applications in the US
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