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Design Optimization of Motor/Generator Full-load Characteristics in Two-mode Hybrid Vehicles
ISSN: 1946-4614, e-ISSN: 1946-4622
Published April 20, 2009 by SAE International in United States
Citation: Ahn, K. and Papalambros, P., "Design Optimization of Motor/Generator Full-load Characteristics in Two-mode Hybrid Vehicles," SAE Int. J. Passeng. Cars – Electron. Electr. Syst. 2(1):389-396, 2009, https://doi.org/10.4271/2009-01-1317.
An important benefit in adopting multi-mode hybrid powertrains is the possibility of downsizing the electric motor/generator (M/G) units. This paper discusses design optimization of M/G full-load operation envelopes. A three-dimensional operation space analysis is introduced and the full-load speed-torque envelopes of M/G units appear as constraints in the powertrain operation space. The analysis shows how the change in the M/G characteristics affects the powertrain full-load performance and how the M/G units can be downsized by combining multiple modes. When the acceleration performance of a two-mode hybrid vehicle is estimated using this analysis method, the trade-off between enhancing performance and reducing M/G full-load capacities is formulated as an optimization problem. The results show significant improvement in dynamic performance at reduced M/G cost.