Mechanism of vehicular periodic operation for optimal fuel economy in free-driving scenarios

Shengbo Eben Li; Xiaosong Hu; Keqiang Li; Changsun Ahn

Mechanism of vehicular periodic operation for optimal fuel economy in free-driving scenarios

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Author(s): Shengbo Eben Li ¹ ; Xiaosong Hu ² ; Keqiang Li ¹ ; Changsun Ahn ³
- Affiliations: 1: State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Beijing 100084, People's Republic of China;
  2: Department of Signals and Systems, Chalmers University of Technology, 41296 Gothenburg, Sweden;
  3: School of Mechanical Engineering, Pusan National University, Busan 609-735, Republic of South Korea
Source: Volume 9, Issue 3, April 2015, p. 306 – 313
DOI: 10.1049/iet-its.2014.0002 , Print ISSN 1751-956X, Online ISSN 1751-9578

Received 02/01/2014, Accepted 21/07/2014, Revised 12/06/2014, Published 26/08/2014

In addition to the fuel-efficient design of vehicles, eco-driving technologies can further reduce the fuel consumption and carbon emissions of road transportation. One of the major issues in eco-driving technologies is how to determine the fuel savings or fuel-optimised operating strategies of the power train. We examine the periodic operation of autonomous vehicles in free-driving scenarios with the purpose of maximising fuel economy. The design of such strategies can be considered to be an optimal control problem, which is proved by π-test to have singular arcs because of the S-shaped engine fueling rate. The optimal operations are solved numerically by using the Legendre pseudospectral method, and many are found to demonstrate periodic behaviours, that is, pulse and gliding. In periodic operation, the engine switches between the minimum break specific fuel consumption point and the idling point, while the vehicle speed oscillates between its upper and lower bounds. The formation of periodic operation, as well as some key properties, is analysed and presented.

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Mechanism of vehicular periodic operation for optimal fuel economy in free-driving scenarios

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