Impact of Motor Operation Limits on Fuel Economy for 48V Mild Hybrid Electric Vehicles

Autoren

Youngki Kim, Yu He, Kushagra Upreti, Dewey Jung, University of Michigan-Dearborn, Dearborn, MI, USA;
Sanghoon Yoo, Jason Lee, Jinho Ha, Byungho Lee, Hyundai America Technical Center Inc., Superior Township, MI, USA

Zusammenfassung

The 48 V mild hybrid electric powertrain is one of the most attractive options for lower CO₂ emissions because of its compactness and its cost-effective gain in fuel economy. In real applications, the operation range of the electric motor(s) has to be limited for practical reasons. In this study, we present the impact on fuel economy of various torque limits on the motor(s) in application to P0 and P0+P4 mild hybrid electric vehicles. To evaluate the potential for fuel economy, an optimal torque-split problem is formulated and numerically solved by dynamic programming for urban and highway driving cycles. Simulation results revealed (i) non-negligible negative contribution of
the torque limits to fuel economy under urban traffic conditions impacts and (ii) realistic fuel economy benefits from the integration of a P4 module to the P0 configuration.

Mitglieder-Login