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Analysis of Various Operating Strategies for a Parallel-Hybrid Diesel Powertrain with a Belt Alternator Starter
Abstract:
The sustainable use of energy and the reduction of pollutant
emissions are main concerns of the automotive industry. In this
context, Hybrid Electric Vehicles (HEVs) offer significant
improvements in the efficiency of the propulsion system and allow
advanced strategies to reduce pollutant and noise emissions.
The paper presents the results of a simulation study that
addresses the minimization of fuel consumption, NOx
emissions and combustion noise of a medium-size passenger car. Such
a vehicle has a parallel-hybrid diesel powertrain with a
high-voltage belt alternator starter. The simulation reproduces
real-driver behavior through a dynamic modeling approach and
actuates an automatic power split between the Internal Combustion
Engine (ICE) and the Electric Machine (EM). Typical characteristics
of parallel hybrid technologies, such as Stop&Start,
regenerative braking and electric power assistance, are implemented
via an operating strategy that is based on the reduction of total
losses.
After model calibration and validation against available
experimental data, various Hybrid Operating Strategies (HOS) have
been examined. These are investigated over the New European Driving
Cycle (NEDC) and the Artemis Urban Cycle (AUC) in terms of fuel
economy, NOx emissions and combustion noise. Finally,
optimal calibrations are suggested as the best compromise between
all the analyzed targets.
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