【摘 要】
：
Vehicle downshifting during braking for the hybrid electric vehicle (HEV) equipped with the automatic mechanical transmission(AMT) could adjust work points of the motor.Thus,downshifting has great potential to effectively improve the efficiency of brak-in
【机 构】
：
State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China;School
论文部分内容阅读
Vehicle downshifting during braking for the hybrid electric vehicle (HEV) equipped with the automatic mechanical transmission(AMT) could adjust work points of the motor.Thus,downshifting has great potential to effectively improve the efficiency of brak-ing energy recovery.However,the power interruption during shifting could cause some loss of regenerative energy meanwhile.Hence,the choice of the downshifting point during vehicle braking which has crucial effect on energy recovery efficiency needs to be intensively studied.Moreover,the real-time application of the high-efficiency braking energy recovery strategy is a challenging problem to be tackled.Therefore,this paper proposes a dynamic-programming-rule-based (DPRB) downshifting strategy for a specific hybrid electric bus (HEB) driving condition.Firstly,the braking characteristic of the HEB during the process of pulling in is analyzed.Secondly,the medium-time-distance (MTD) demonstrating the dimension of time and space is proposed to define the boundary condition of the running bus.Then,look-up tables are established based on a dynamic programming algorithm offline using multiple sets of historical data.Thus,Based on the real-time driving data,whether to enter the optimal gear selection process can be decided online.Finally,simulations and hardware-in-the-loop (HIL) tests are carried out,and the results show that the proposed method can be indeed effective for braking energy recovery.
其他文献
Calcium carbonate is promising thermochemical heat storage material for next-generation solar power systems due to its high energy storage density,low cost,and high operation temperature.Researchers have tried to improve energy storage performances of cal
Dear editor,rnIn recent years,novel MOSFET structures such as fully-depleted silicon-on-insulator(FDSOI)MOSFET and Fin-FET are adopted by the industry for their excellent elec-trostatic behavior and higher on-state current per footprint.Nevertheless,these
Dear editor,rnCompressed sensing (CS)[1],as an efficient data acquisi-tion paradigm,has attracted much attentions since it came up.The fundamental principle of CS is that a signal,which is sparse under some sparsity basis,can be efficiently ac-quired and
A novel Al0.5V0.1FeCrMnNi0.9 high-entropy alloy was designed to achieve enhanced strength and plasticity.The as-cast Al0.5V0.1FeCrMnNi0.9 alloy shows a typical dendritic microstructure consisting of a body-centered cubic-structured matrix phase and a B2-s
Dear editor,rnTo meet the requirement of rapid growth in the number of mobile terminals and demand for network service qual-ity from users,wireless networks must implement faster and more intelligent network operation and maintenance func-tions.One feasib
Dear editor,rnNon-orthogonal multiple access(NOMA),regarded as a promising technique for substantially increasing the spec-tral efficiency of wireless networks that comprise massive devices,has exhibited a number of significant performance advantages,incl
Nonnegative tensor decomposition has become increasingly important for multiway data analysis in recent years.The alternating proximal gradient (APG) is a popular optimization method for nonnegative tensor decomposition in the block coordinate descent fra
A reliable 235U enrichment uniformity detection system based on a compact D-D neutron generator is developed to detect the 235U enrichment uniformity of different fuel elements in the same nuclear fuel rod.The high-yield compact D-D neutron generator prov
The flow field is a pivotal part to manage the transport of water and gas in proton exchange membrane fuel cell.However,the reported water measurement methods(e.g.,X-ray and electrochemical impedance spectroscopy(EIS))cannot give a compre-hensive understa
Dear editor,rnIn remote sensing research,change detection is said to be a hot spot because of its many applications[1],and lots of synthetic aperture radar(SAR)image change detection methods are proposed.In this study,to address the prob-lem that the accu