Method for Switching between Traction and Brake Control for Speed Profile Optimization in Mountainous Situations

Nan Lin, Changfu Zong and Shuming Shi
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Nan Lin: State Key Laboratory of Automotive Simulation and Control, Jilin University, Jilin 130022, China
Changfu Zong: State Key Laboratory of Automotive Simulation and Control, Jilin University, Jilin 130022, China
Shuming Shi: Transportation College, Jilin University, Jilin 130022, China

Energies, 2018, vol. 11, issue 11, 1-13

Abstract: Making full use of front road grade information to achieve the best fuel efficiency is important for intelligent vehicles. Normal theoretical studies pay too much attention to engine continuous feedback control. The theoretical foundation of switching between traction and brake control has been ignored. In mountainous terrain, both the engine and road slopes are energy sources. Switching between traction and brake control is the key point. This research focuses on broadening the normal control range. The comprehensive objective function that contains traction and brake control is built, and then the analytical switching control law is derived based on Pontryagin’s maximum principle (PMP). Analytical switching control laws express the mechanism of switching between traction and brake control for economic cruise control (ECC). Simulation results show that the model can solve the switch time and the entire speed profile precisely. Brake control is very important in downhill situations. The parameters in the objective function influence not only the switch time but also the switch process. This research offers a theoretical foundation for ECC with road slopes and can make onboard control more precise and efficient.

Keywords: economic cruise control; road slope; switch control; optimal control; heavy duty vehicle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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