This paper evaluates the potential gain in fuel economy of a hybrid vehicle, if terrain preview is predictively utilized in the vehicle's energy management. The optimal energy management strategy is calculated numerically when future grade is known and for different known cruise velocities. The resulting fuel economies are compared to those of baseline strategies without preview. Simulations over real-world hilly roads shows a potential for up to 6 percent improvement in fuel economy. It is shown that this level of improvement depends on the cruise speed, the control strategy, and the road profile. Section 2 presents the vehicle configuration and its model for simulation. Then the authors introduce 7 grade profiles in section 3 for simulation grade inputs. 3 of them are simulated arc terrains and other 4 are real terrains from Costa Contra County in California. In section 4, different control strategies are discussed and developed including strategies without preview i.e. rule-based strategy and baseline ECMS and the ones with future preview i.e. ECMS and dynamic programming. In section 5 simulation results over various terrain and with different velocities are presented. Section 6 concludes the paper with a summary of their observations.
Utilizing road grade preview for increasing fuel economy of hybrid vehicles
Einsatz einer Strassenneigungsvorschau zur Erhöhung der Kraftstoffeinsparung von Hybridfahrzeugen
2009
6 Seiten, 9 Bilder, 2 Tabellen, 17 Quellen
Conference paper
English
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