Convex modeling for optimal battery sizing and control of an electric variable transmission powertrain
School of Electrical Engineering and Automation, Harbin Institute of Technology, 15001 Harbin, China
2 Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
* Corresponding author: email@example.com
Accepted: 17 December 2018
This paper provides convex modeling steps for the problem of optimal battery sizing and energy management of a plug-in hybrid electric vehicle with an electric variable transmission. Optimal energy management is achieved by a switched model control, with driving modes identified by the engine on/off state. In pure electric mode, convex optimization is used to find the optimal torque split between two electric machines, in order to maximize powertrain efficiency. In hybrid mode, optimization is performed in a bilevel program. One level optimizes speed of a compound unit that includes the engine and electric machines. Another level optimizes the power split between the compound unit and the battery. The proposed method is used to minimize the total cost of ownership of a passenger vehicle for a daily commuter, including costs for battery, fossil fuel and electricity.
© Z. Ma et al., published by IFP Energies nouvelles, 2019
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