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Electric vehicle (EV) travel planning is a complex task that involves planning the routes and the charging sessions for EVs while optimizing travel duration and cost. We show the applicability of the multi-objective EV travel planning algorithm with practically usable solution times on country-sized road graphs with a large number of charging stations and a realistic EV model. The approach is based on multi-objective A* search enhanced by Contraction hierarchies, optimal dimensionality reduction, and sub-optimal ϵ-relaxation techniques. We performed an extensive empirical evaluation on 182,000 problem instances showing the impact of various algorithm settings on real-world map of Bavaria and Germany with more than 12,000 charging stations. The results show the proposed approach is the first one capable of performing such a genuine multi-objective optimization on realistically large country-scale problem instances that can achieve practically usable planning times in order of seconds with only a minor loss of solution quality. The achieved speed-up varies from ~11× for optimal solution to more than 250× for sub-optimal solution compared to vanilla multi-objective A*.
Cuchý et al. (Thu,) studied this question.
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