Electrified Powertrain with Multiple Planetary Gears and Corresponding Energy Management Strategy

Modern hybrid electric vehicles (HEVs) like the fourth generation of Toyota Prius incorporate multiple planetary gears (PG) to interconnect various power components. Previous studies reported that increasing the number of planetary gears from one to two reduces energy consumption. However, these stu...

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Bibliographic Details
Published in:Vehicles 2021-09, Vol.3 (3), p.341-356
Main Authors: Rajput, Daizy, Herreros, Jose M., Innocente, Mauro S., Schaub, Joschka, Dizqah, Arash M.
Format: Article
Language:English
Subjects:
AMPL
Automobiles
Energy consumption
Energy efficiency
Energy management
Gear trains
Hybrid electric vehicles
Modal choice
mode dynamics
optimal control
Optimization
planetary gear box
Powertrain
Topology
Torque
transmission
Vehicles
Velocity
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Summary:Modern hybrid electric vehicles (HEVs) like the fourth generation of Toyota Prius incorporate multiple planetary gears (PG) to interconnect various power components. Previous studies reported that increasing the number of planetary gears from one to two reduces energy consumption. However, these studies did not compare one PG and two PGs topologies at their optimal operation. Moreover, the size of the powertrain components are not the same and hence the source of reduction in energy consumption is not clear. This paper investigates the effect of the number of planetary gears on energy consumption under optimal operation of the powertrain components. The powertrains with one and two PGs are considered and an optimal simultaneous torque distribution and mode selection strategy is proposed. The proposed energy management strategy (EMS) optimally distributes torque demands amongst the power components whilst also controlling clutches (i.e., mode selection). Results show that increasing from one to two PGs reduces energy consumption by 4%.
ISSN:2624-8921
2624-8921
DOI:10.3390/vehicles3030021