Figure 1. Graduate students Nassir Uddin and Alper Unal
examine and operate the portable on-board emissions
measurement device installed in a Toyota Camry with
manual 5 speed transmission.
Figure 2. View of the On-Board Emissions Measurement System
installed in a Toyota Camry, with the engine data link shown in
the lower left corner of the photo.
Figure 3. View of the tailpipe exhaust probe.
Figure 4. The On-Board Emissions Measurement system draws
power from a cigarette ligher or other power outlet, as shown
Figure 5. A view of a fully instrumented car. All that is apparent
from the exterior is the sampling hose and the information sign.
The sampling hose is easily secured to the car using clamps.
In this case, the hose is clamped to the license plate and radio
antenna, and is routed through the rear passenger window to
Figure 6. Emission measurements are obtained during
actual driving, as shown here for a passenger van
Figure 7. Collecting data from a passenger van
(white vehicle, center lane) while
driving on the Raleigh Beltline .
A distinguishing feature of this study is that we are focusing on collection
of data under actual driving conditions. This is in contrast to most
vehicle emissions studies, which have focused on laboratory measurements
under simulated driving conditions. Our laboratory is the open road,
and we collect data out in the real world. We face the same traffic
conditions as everyone else, including variations in traffic congestion,
the effect of construction sites and delays due to accidents, variation
in weather conditions (e.g., extreme heat of a very hot dry summer here
in North Carolina), etc.
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