Integrated vehicle and powertrain optimization for passenger vehicles with vehicle-infrastructure communication

Jia Hu, Yunli Shao, Zongxuan Sun, Joe Bared

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


This research proposes an optimal controller to improve fuel efficiency for a vehicle equipped with automatic transmission traveling on rolling terrain without the presence of a close preceding vehicle. Vehicle acceleration and transmission gear position are optimized simultaneously to achieve a better fuel efficiency. This research leverages the emerging Connected Vehicle technology and utilizes present and future information—such as real-time dynamic speed limit, vehicle speed, location and road topography—as optimization input. The optimal control is obtained using the Relaxed Pontryagin's Minimum Principle. The benefit of the proposed optimal controller is significant compared to the regular cruise control and other eco-drive systems. It varies with the hill length, grade, and the number of available gear positions. It ranges from an increased fuel saving of 18–28% for vehicles with four-speed transmission and 25–45% for vehicles with six-speed transmission. The computational time for the optimization is 1.0–2.1 s for the four-speed vehicle and 1.8–3.9 s for the six-speed vehicle, given a 50 s optimization time horizon and 0.1 s time step. The proposed controller can potentially be used in real-time.

Original languageEnglish (US)
Pages (from-to)85-102
Number of pages18
JournalTransportation Research Part C: Emerging Technologies
StatePublished - Jun 1 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd


  • Connected vehicle
  • Eco-driving
  • Fuel efficiency
  • Powertrian and speed integrated control
  • Rolling terrains


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