Energy recovery potential through regenerative braking for a hybrid electric vehicle in a urban conditions

International Conference on the Sustainable Energy and Environmental Development

生态环境科学

Pielecha, I.^1 ; Cielik, W.^1 ; Szalek, A.^2

Institute of Combustion Engines and Transport, Poznan University of Technology, Piotrowo 3 street, Poznan

60-965, Poland^1

Toyota Motor Poland Company Limited, Konstruktorska 5 street, Warszawa

02-673, Poland^2

关键词: Driving conditions;    Electrical equipment;    Energy recovering;    Hybrid drive systems;    Parallel hybrids;    Start-up conditions;    Urban conditions;    Urban environments;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/214/1/012013/pdf
DOI  :  10.1088/1755-1315/214/1/012013

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Vehicles with hybrid drive systems are being equipped with solutions that increase the drive systems efficiency more and more often. One such solution is the energy recovery during braking. Additionally this process leads to a voltage increase of the energy recovering generator. Battery voltage is increased several times in the inverter system in order to increase the electric generator power. The article presents the possibility of such a voltage gain from vehicle braking in urban driving conditions. The latest models of vehicles with hybrid drive systems were used in the tests, equipped with the same drive units, these were: Lexus NX 300h and Toyota RAV4 Hybrid. These are vehicles equipped with parallel hybrid drives (full hybrid). The tests were performed in an urban environment in the city of Warsaw, on the same routes. The study analyses the startup conditions of such a system and the characteristics of its operation. It has been shown that the increase in the voltage powering the electrical machinery occurs in both vehicles at high torque values. It has also been shown that rise in electrical equipment voltage for both of these vehicles mostly depends on their engine speed, and not on the generated power or torque (braking). The maximum voltage increase - almost threefold (up to 650 V) also allows for a two-fold increase in the drive system breaking torque.