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Collection and Evaluation of
On-Road Vehicle Emission Data and Activity
Principal Investigator:
Dr. Lei Yu
Sponsoring Agency:
Houston Advanced Research Center, HARC
H8B.2003-BY
Period:
September 15, 2003 ~ March 31, 2004
Research
Abstract:
In this project,
the newly developed on-road emission measurement
device OEM-2100 was employed to collect the
emission data in Houston area. The device was
developed by the Clean Air Technology
International, Inc. and is capable of measuring
the second-by-second fuel consumption and
emissions of NOx, HC, CO, CO2, and PM. Emission
data under a total of 170 different test
conditions (or called 170 bags) were collected
in Houston covering freeways, arterials,
intersections and also idling. Testing vehicles
included rental cars and trucks, as well as the
volunteers’ personal cars. GPS data were
collected simultaneously when the emission data
were collected. All the collected data were
stored in text format (GPS data is in the format
of .gps, which can be used as text files.)
The large amount
of data was processed in EXCEL. Emissions for
trucks and for cars were summarized based on
different test conditions (arterial road,
freeway, feeder, intersection, and idling.) The
spatial and temporal distributions of both
vehicle speed and emissions were plotted, and
the relationships between the emissions and
model variables (speed, acceleration, and engine
rpm) were drawn. The measured emissions were
compared with the EPA MOBILE6.2 estimates sorted
on test conditions, emission factors, and
vehicle types; and significant differences were
found. It is recommended that more emission data
be collected in Houston for the established data
base. Also recommended is to develop a
user-friendly EXCEL-based utility for the fast
processing of collected data for both general
purpose and for specific utilization.
Research
Information
For further information about the research,
please contact Dr. Lei Yu by telephone at
(713) 313-7282 or by e-mail at
yu_lx@tsu.edu.
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