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Engine-in-the-Loop Analysis of the Influence of Manual Gearshift Duration on Vehicle Consumption and Emissions
Journal Article
15-16-01-0003
ISSN: 2770-3460, e-ISSN: 2770-3479
Sector:
Topic:
Citation:
Gilormini, T., Chessé, P., Tauzia, X., and Colin, H., "Engine-in-the-Loop Analysis of the Influence of Manual Gearshift Duration on Vehicle Consumption and Emissions," SAE Int. J. Passeng. Veh. Syst. 16(1):35-52, 2023, https://doi.org/10.4271/15-16-01-0003.
Language:
English
Abstract:
The tightening of emission standards and homologation rules lead car
manufacturers to rely on simulation testing in early development phases.
Coupling an engine to a testbench controlled by a real-time simulation
environment allows flexible, reliable, and reproducible testing for consumption
and emission studies. However, interest in this method referred to as
engine-in-the-loop (EiL) is relatively recent and few details can be found
regarding the simulation environment. Following previous work, this study
details a driver model based on the PI structure and augmented with preview and
anti-windup. The focus is set on a conventional powertrain with a manual
transmission for which the driver must also manage the clutch pedal during
gearshift and take-off phases. Extended analysis of vehicle tests allows
defining the driver’s behavior during these phases for different profiles. The
driver model is then tested in the EiL environment and the impact of the
gearshift profile on fuel consumption and pollutant emissions can be assessed.
Besides the slight increase in fuel consumption, results show that increasing
the gearshift duration degrades the regulation of the richness by the ECU, thus
increasing CO engine-out emissions as well as decreasing NOx emissions. Finally,
results suggest that a longer gearshift also affects the catalyst efficiency,
which results in higher NOx tailpipe emissions.