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Driver Variability Influences on Real World Emissions at a Road Junction using a PEMS
Technical Paper
2010-01-1072
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A Euro 2 SI (Spark Ignition) Mondeo was investigated for a fully
warmed-up vehicle on a simple urban driving loop. Emissions were
monitored using an on-board Horiba OBS (On-Board emission
measurement System) 1300. 10 laps of a 0.6 km loop were driven by
each driver and this involved 4 junctions per lap. Statistical
analysis of 20 drivers was made over 27 repeat junction events for
each driver. The statistical analysis of the data showed that for
all drivers the CO₂, speed and throttle position were more typical
Gaussian in their distribution. NOx and CO on the other hand were
lognormal in their distribution. Acceleration, positive and
negative throttle jerks (rate of change of throttle angle) were
borderline Gaussian. HC (Hydrocarbon) emissions were not Gaussian
and there was some evidence for a gamma distribution and for a
lognormal distribution. Comparison of mean HC emissions between the
drivers was therefore not reliable.
The variation in mean speed between the drivers was small from
24-32 km/hr, but there was a much greater variation in mean
acceleration rates from 0.4 - 1.2 m/s2. There was also a wide
variation in average throttle position from 2.5 - 10.3% and an even
greater variation in throttle positive jerk, from 5-22%/s. These
different driving modes for the same road event resulted in major
differences in emissions. CO₂ varied from 235 - 339 g/km for the 20
drivers with CO varying from 0.27 to 10.7 g/km, HC from 0.06 to 0.2
g/km and NOx from 0.27 to 0.8 g/km. There were even larger
variations between drivers if the worst case emissions were
compared for all the drivers. These results show that driver
behavior has a major impact on real-world emissions and indicate
that the potential of using electronic control throttle (ETC) to
control acceleration and deceleration events could have a major
impact on reducing real-world emissions.
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Citation
Daham, B., Li, H., Andrews, G., Tate, J. et al., "Driver Variability Influences on Real World Emissions at a Road Junction using a PEMS," SAE Technical Paper 2010-01-1072, 2010, https://doi.org/10.4271/2010-01-1072.Also In
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