Regenerative Braking Compensatory Control Strategy Considering CVT Power Loss for Hybrid Electric Vehicles

Yang Yang, Xiaolong He, Yi Zhang and Datong Qin
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Yang Yang: State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
Xiaolong He: School of Automotive Engineering, Chongqing University, Chongqing 400044, China
Yi Zhang: Department of Mechanical Engineering, University of Michigan-Dearborn, Dearborn, MI 48128, USA
Datong Qin: State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China

Energies, 2018, vol. 11, issue 3, 1-15

Abstract: Hybrid electric vehicles (HEV) equipped with continuously variable transmission (CVT) adjust the motor operating point continuously to achieve the optimal motor operating efficiency during regenerative braking. Traditional control strategies consider the CVT efficiency as constant, while the CVT efficiency varies in different operating conditions. In order to reflect the transmission efficiency more accurately during regenerative braking, the CVT theoretical torque loss model is firstly established which then leads to the battery–front motor–CVT joint operating efficiency model. The joint operating efficiency model indicates that the system efficiency is influenced by input speed, input torque, CVT speed ratio, and battery SOC (state of charge). The compensatory strategy for the front motor barking force is proposed to make full use of its braking power and the CVT speed ratio control strategy is modified to maintain the optimal operating efficiency of the system. The simulations are performed under three typical braking conditions and UDDS, NYCC, US06 respectively, the results show that the modified control strategy increases the front motor braking power and improves the system operating efficiency.

Keywords: HEV; regenerative braking; system efficiency; braking force compensation; CVT ratio control strategy (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 references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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