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Fuel Economy Analysis of a Series Hybrid Electric Bus with Low-Speed Shutdown Control Strategy
Xiaogang Wu,Han Chen,Jiuyu Du,Chen Hu 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
The series hybrid electric bus that is demonstrated operating in China has the problem of non-ideal fuel economy for the conventional auxiliary equipment can’t shut down the engine. Based on the series hybrid electric bus using electric auxiliary equipment, a control strategy is proposed based on the combination of engine low-speed shutdown and load following. The main control variables are battery SOC and vehicle speed, and the engine low-speed shutdown is realized. Three different driving cycles are employed: Chinese city driving cycle, Zhuzhou city of Hunan province driving cycle, and Hefei city of Anhui province driving cycle. By using the analysis method of the energy flow diagram, the fuel economy in different driving cycles is compared and analyzed. The simulation results show that the control strategy of the engine low-speed shutdown affects little on fuel economy in different driving cycles. All the fuel-saving ratios of the series hybrid system in different driving cycles can reach above 25%.
Hong Kong Panel Study of Social Dynamics (HKPSSD): Research Designs and Data Overview
( Xiaogang Wu ),( Clear Water Bay ),( Hong Kong Sar ) 한국보건사회연구원 2015 한국복지패널 학술대회 논문집 Vol.8 No.-
The Hong Kong Panel Study of Social Dynamics (HKPSSD)aims to establisha city-wide representative household panel survey to track socioeconomic changes and its impact on people`s livelihood in Hong Kong. The content covers housing, economic activity and consumption at household levels and education, marriage, fertility, employment, health, daily social activities, mental health and social attitude at individual levels. Three waves of data have been completed in 2011, 2013 and 2015, respectively. 3,214 households, 7,218 adults and 958 children have been interviewed in the benchmark survey (Wave 1), among which 2,165 households, 4,270 adults and 623 children are re-interviewed in the second wave. In addition, a refreshment sample of 1,007 households (including 1,960 adults and 145 children) with new themes was added in 2014, which together with those remaining in Wave 2, are followed in Wave 3 in 2015. This essay introduces the background, research designs, and content coverage of three waves of HKPSSD, and presents some descriptive statistics of relevant variable in the data. HKPSSDis expected to serve an important database for social science research and policy study in Hong Kong, and for comparative analyses of Chinese societies in Hong Kong, Taiwan and mainland China.
Switched‑capacitor‑based high‑gain DC–DC converter for fuel cell vehicle powertrain
Xiaogang Wu,Jiulong Wang,Yun Zhang,Zhengxin Liu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.4
A novel DC–DC converter with switched capacitor is proposed to satisfy the requirements of fuel cell vehicles for DC–DC converter in terms of step-up ratio, efficiency, and voltage stress. The proposed converter has the advantages of high step-up ratio, low voltage stress of each device, the common ground, high efficiency, and small size. It is compared with other converters in the above aspects. The dynamic model of the proposed converter can be obtained on the basis of the small-signal modeling method and the state space average method. Experimental results show that the proposed converter has a high step-up ratio under a nonextreme duty cycle state, and the highest efficiency is 94.25%. Compared with the dual-switch boost converter, the proposed converter has certain advantages in terms of step-up ratio, component voltage stress, and efficiency. Consequently, it is more suitable for the powertrain of fuel cell vehicles.
Xiaogang Li,Renchun Yang,Junsheng Wu,Xin Zhang,Zhihua Zhang 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
Two mesoporous material Ni/γ-Al2O3 catalysts were prepared and characterized by ICP-AES, XRD, and TPR. The differences in reaction activity between Ni-in-Al2O3 and Ni-on-Al2O3 were investigated for hydrotreating of crude 2-ethylhexanol. The results show that the Ni species (Ni-on-Al2O3) exhibit excellent hydrogenation activities at a wide range of H2 pressure and space velocity, while the Ni species (Ni-in-Al2O3) exhibit similar activities with those of Ni-on-Al2O3 only at higher H2 pressure and lower space velocity. Due to the presence of extensively exposed Ni species on the Ni-on-Al2O3 catalyst, its hydrogenation performance was increased significantly because of the low interphase mass transfer resistance.
Carbon Nanotube Paper as Anode for Flexible Lithium-Ion Battery
Xiaogang Sun,Zhenhong Liu,Neng Li,Xiaoyong Wu,Yanyan Nie,Zhipeng Pang,Lifu Yue,Hao Tang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11
In this investigation, multiwalled carbon nanotube (MWCNT) paper consists of MWCNTs and cellulose was fabricated by traditional paper-making method. It was applied directly as negative electrode in flexible lithium ion battery to replace ordinary electrode which is combined with anode material and current collector. The electrochemical performances of the as-produced MWCNT paper (AMP) and carbonized MWCNT paper (CMP) were evaluated in this study. The morphology and structure of the MWCNT papers were observed by scanning electron microscopy (SEM). The electrochemical performance of the battery was operated by cell test and electrochemical impedance spectroscopy (EIS) measurement. The charging and discharging results indicated that the CMP behaves with higher capacity than AMP. And the EIS analysis showed that a lower charge transfer resistance can be obtained in the CMP. The excellent electrochemical performance verifies the feasibility of MWCNT papers as a promising candidate for the anode in flexible lithium ion battery.
Sun Yanzhou,Xiaogang Wu,Zhengxin Liu,Yu Boyang 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2
The hybrid energy source system (HESS) with batteries and super-capacitor can eff ectively prolong the cycle life of batteries in electric vehicles (EVs). In order to further highlight the advantages of HESS in improving EVs effi ciency, The DC/DC converter in HESS should have the advantages of high effi ciency and fast response speed. Therefore, a soft-switching nonisolated buck-boost bidirectional DC/DC converter is applied to the HESS system of EVs in this paper. The converter has the advantages of being a simple circuit, a reduced number of components and can realize ZVS of all switches without an auxiliary circuit. In addition, a non-inductive current circulation control method is adopted in order to further improve the effi ciency of the converter. The controller of the converter is designed based on small signal modeling, and an experimental prototype has been developed. The experimental results show that, compared to the inductive current circulation method, the non-inductive current circulation control method can eff ectively reduce the loss of the inductor, and the maximum effi ciency of the converter is 92.8% in step-down mode and 93.2% in step-up mode.