柴油发动机和排放系统集成NOx吸附还原催化器
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R
“Systems Approach”
策略改进
region of intercept
region of intercept
ERIC
CONTROL
STOCK CONTROL
51015202530350
51015202530
Design Integration
Strategy Select Platform
Select Emissions Solution/ Design system
Test Performance
Study Emission
Calibrate and Tune
Test Performance
LNC
NO
x
NO x/PM Control
LNT Oxidation Catalyst
Combination
PM
Solids
SOF
SCR
Active Passive
DPF
(Diesel Particulate Filter) Integrated System
6
•Identify target technology
8
Lean NOx Traps (NOx Adsorbers)
•Uses Same Onboard HC (Diesel Fuel)
•Can Achieve High NO
x Conversion-(90%+)
•
Active Temperature Range -250C to 450C
Advantages 优点
•
Extreme Sensitivity to Sulfur •Very Complex Controls •Uncertain Durability
•
Fuel Consumption Penalty -appears to be in 1.5-6% range, depending on sulfur Disadvantages 缺点
Integration Needs:
•Identify target technology
•Highlighted Technology for this discussion:
NAC for NOx
•Identify technology specific needs •Determine component layout based on performance and installation constraints •Design Control Scheme
•Set performance criteria
•Temperature: Activity Window •Inlet Concentration: Capacity and
Breakthrough •Regeneration: Periodic Rich Excursion
to clean Trap
Temperature Requirements •NO+1/2O2=> NO2
Temperature Requirements
•NO + 1/2O 2=> NO 2
NO 2+ MO X => MNO 3
Temperature Requirements
NO 2+ MO X => MNO 3
•Temperature: Activity Window •Inlet Concentration: Capacity and
Breakthrough •Regeneration: Periodic Rich Excursion
to clean Trap
Aged NOx Adsorber Performance (tested at 30,000 s.v.)
•Temperature: Activity Window •Inlet Concentration: Capacity and
Breakthrough •Regeneration: Periodic Rich Excursion
to clean Trap
NAC Source: SAE Paper 2000-01-2911
Integrate Mass of NO X Stored in NAC.A Target Mass is Set to Trigger Regeneration.
R
Integrate Mass of NO
X Stored in NAC.A Target Mass is Set to Trigger Regeneration.
R ECS Strategy
I II
III EGR Controller NO x Mass Model
Regen State
Determination
Mass Reductant Regeneration Controller Burner Controller
•Identify target technology
•Highlighted Technology for this discussion:
NAC for NOx
•Identify technology specific needs •Determine component layout based on performance and installation constraints •Design Control Scheme
•Set performance criteria