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DIESEL INSPECTION AND
MAINTENANCE (I/M) PILOT
PROGRAM RESULTS
Surface Transportation Technical CommitteeJanuary 23, 2014
Amanda Brimmer, Principal Air Quality PlannerNorth Central Texas Council of Governments1
Currently no emissions testing for diesel vehicles in Texas
Light-Duty Vehicles ≤ 8,500 lbs gross vehicle weight rating (GVWR)
Medium-Duty Vehicles = 8,501 – 14,000 lbs GVWR
Heavy-Duty Vehicles ≥ 14,001 lbs GVWR
2012 On-Road NOx Emissions Inventory
On-Road Emissions = 181 tons per day (tpd) NOx
Source: Texas Commission on Environmental Quality (TCEQ)
DIESEL INSPECTION AND MAINTENANCE (I/M) Need For Testing
All Gasoline Vehicles
59%
Heavy-Duty Diesel
Vehicles38%
Light- and Medium-Duty Diesel Vehicles
3%
2
On-Road 49%
Non-Road 27%
Other 24%
DIESEL I/M PILOT PROGRAM
Investigate a heavy-duty diesel vehicle (HDDV) I/M Program for the Dallas-Fort Worth (DFW) region
Characterize NOX emissions from HDDVs through on-site pilot testing study
Assess data, validity, and implications for HDDV I/M or screening programs
3Project Purpose
Idea Mock-up Prototype
North Central Texas Council of Governments (NCTCOG)
Texas A&M Transportation Institute (TTI)
Texas Department of Motor Vehicle (TxDMV)
Texas Department of Public Safety (DPS)
Texas Department of Transportation (TxDOT)
University of Denver (DU)
DIESEL I/M PILOT PROGRAM Partners
4
LocationNew Waverly Weigh Station (NWWS), Northbound I-45
TimelineJune 11-22, 2012
Vehicles Tested ~1,500 long-haul HDDVS
Most headed for DFW10 Control Vehicles
Validated via Portable Emissions Monitoring System (PEMS)
5
DIESEL I/M PILOT PROGRAM Site Selection
SHED PROTOTYPE
Streamlined Heavy-Duty Emissions Determination (SHED) prototype
Test Setup7
License plate data from TxDMV and five other states
Model year distribution for TX vehicles very similar to statewide distribution
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OLD
ER
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Model Year
DMV Data NWWS Data
TxD
MV
Reg
istr
atio
n D
ata
Site Ob
servatio
ns at N
WW
S
DIESEL I/M PILOT PROGRAM Fleet Model Year Analysis
8
Model Year
1989
1990
1991
1992
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1994
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1996
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2002
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2004
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2008
2009
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2011
2012
2013
Em
issi
on R
ate
s of
HD
DV
s (g
of
NO
x/kg
of
CO
2)
0
10
20
30
40
50
SHED DATA ANALYSISTesting Methodology Correlation and Results
NOX Emissions Testing Correlation
SHED
Em
issi
on
Rat
es
(g N
Ox/
kg C
O2
)
HDDV Model Year
SHEDRemoteSensing
Opacity
PEMS Very Good Good Poor
9
PollutantPercentage of Vehicles
Percentageof Emissions
NOX 7% 19%
CO 15% 71%
HC 11% 44%
PM 13% 62%
SHED DATA ANALYSISVehicle Identification for High Emissions of NOX 10
SHED: Viable HDDV I/M Technology
Benefits and Other Applications“Clean screening” for fleet
Can capture both intra- and inter-state vehiclesCompliance check for advance emissions control technologyEvaluation of alternative fuels and technologies
Identified Next StepsEngage the US Environmental Protection Agency (EPA) Seek guidance to be able to claim emissions credits for dieselOptimize SHED technology and operationsEstablish appropriate cut-pointsUtilize data collected for MOVES model refinement
DIESEL I/M PILOT PROGRAM Next Steps – Future for SHED Technology
11
Contact Information
www.nctcog.org/DieselReport
Amanda Brimmer
Principal Air Quality Planner
(817) 608-2354
Shannon Stevenson
Program Manager
(817) 608-2304
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