Energy efficiency analysis of 48 V micro-hybrid system for a heavy-duty truck based on intelligent control
SUN Yunxiang
WANG Bin
LI Ying
ZHANG Zhongzhen
YAN Fuxu
Abstract：To improve the vehicle energy utilization rate and meet the diversified electricity needs of heavy-duty truck user,a 48 V mild hybrid system is built based on a tractor.The control strategy of the motor assistance and the braking energy recovery control strategy of the 48 V mild system are analyzed.The China heavy-duty commercial vehicle test cycle for tractor-trailer(CHTC-TT)is used for the dynamometer test,and the working characteristics of the vehicle under the state of pure diesel and mild hybrid are analyzed.The results show that when the vehicle is tested with CHTC-TT in mild hybrid state,the driving efficiency of the motor in assistance mode is 89.0%,and the energy consumption of the motor assistance per hundred kilometers is 2.477 kW·h.The power generation efficiency in the braking energy recovery mode is 79.5%,and the energy recovery per hundred kilometers is 2.924 kW·h.Under the same condition,compared with the pure diesel state,the average engine speed decreased by 117 r/min,the average load of the whole increased by 0.25%,and the fuel consumption rate per hundred kilometers decreased by 4.17%in the mild hybrid state.The 48 V hybrid system can effectively recycle electric energy to assist the engine drive and the electricity consumption of the whole vehicle,and improve the engine operation condition.
Keywords：48 V micro-hybridbraking energy recoveryauxiliary driveheavy-duty truck
Publication Date：2025-07-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 51-57 )