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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.
Yang Yang; Xiaolong He; Yi Zhang; Datong Qin. Regenerative Braking Compensatory Control Strategy Considering CVT Power Loss for Hybrid Electric Vehicles. Energies 2018, 11, 497 .
AMA StyleYang Yang, Xiaolong He, Yi Zhang, Datong Qin. Regenerative Braking Compensatory Control Strategy Considering CVT Power Loss for Hybrid Electric Vehicles. Energies. 2018; 11 (3):497.
Chicago/Turabian StyleYang Yang; Xiaolong He; Yi Zhang; Datong Qin. 2018. "Regenerative Braking Compensatory Control Strategy Considering CVT Power Loss for Hybrid Electric Vehicles." Energies 11, no. 3: 497.
Hybrid vehicles usually have several braking systems, and braking mode switches are significant events during braking. It is difficult to coordinate torque fluctuations caused by mode switches because the dynamic characteristics of braking systems are different. In this study, a new type of plug-in hybrid vehicle is taken as the research object, and braking mode switches are divided into two types. The control strategy of type one is achieved by controlling the change rates of clutch hold-down and motor braking forces. The control strategy of type two is achieved by simultaneously changing the target braking torque during different mode switch stages and controlling the motor to participate in active coordination control. Finally, the torque coordination control strategy is modeled in MATLAB/Simulink, and the results show that the proposed control strategy has a good effect in reducing the braking torque fluctuation and vehicle shocks during braking mode switches.
Yang Yang; Chao Wang; Quanrang Zhang; Xiaolong He. Torque Coordination Control during Braking Mode Switch for a Plug-in Hybrid Electric Vehicle. Energies 2017, 10, 1684 .
AMA StyleYang Yang, Chao Wang, Quanrang Zhang, Xiaolong He. Torque Coordination Control during Braking Mode Switch for a Plug-in Hybrid Electric Vehicle. Energies. 2017; 10 (11):1684.
Chicago/Turabian StyleYang Yang; Chao Wang; Quanrang Zhang; Xiaolong He. 2017. "Torque Coordination Control during Braking Mode Switch for a Plug-in Hybrid Electric Vehicle." Energies 10, no. 11: 1684.