Enhua Wang

Beijing Institute of Technology

Enhua Wang has been an associate professor of Energy and Power Engineering at the Beijing Institute of Technology since 2016, teaching courses on internal combustion engines. He obtained his bachelor\'s and master\'s degrees at the Department of Automotive Engineering, Tsinghua University, Beijing, China, in 2000 and 2003, respectively. In 2013, he received his Ph.D. from the Beijing University of Technology in the field of engine combustion, conservation, and emissions control. He obtained a postdoctoral fellowship at the State Key Laboratory of Automotive Safety and Energy, Tsinghua University. In 2015, he worked at the School of Engineering, Glasgow University, Scotland, as a research associate for one year. His research interests include the organic Rankine cycle system, simulation and control of internal combustion engines, and solid oxide fuel cells.

2books edited

4chapters authored

Latest work with IntechOpen by Enhua Wang

This book examines internal combustion engine technology and applications of biodiesel fuel. It includes seven chapters in two sections. The first section examines engine downsizing, fuel spray, and economic comparison. The second section deals with applications of biodiesel fuel in compression-ignition and spark-ignition engines. The information contained herein is useful for scientists and students looking to broaden their knowledge of internal combustion engine technologies and applications of biodiesel fuel.

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Internal Combustion Engine Technology and Applications of Biodiesel Fuel

Edited by Enhua Wang

Books edited

Organic Rankine Cycle Technology for Heat Recovery

Edited by Enhua Wang

Chapters authored

A Hybrid Energy Storage System for a Coaxial Power-Split Hybrid Powertrain

By Enhua Wang, Fuyuan Yang and Minggao Ouyang

A hybrid energy storage system (HESS) consisting of batteries and supercapacitors can be used to reduce battery stress and recover braking energy efficiently. In this paper, the performance of a novel coaxial power-split hybrid transit bus with an HESS is studied. The coaxial power-split hybrid powertrain consists of a diesel engine, a generator, a clutch, and a motor, whose axles are arranged in a line. A mathematical model of the coaxial power-split hybrid powertrain with an HESS is established and the parameters are configured using experimental data. Subsequently, to estimate the system performance, a program is designed based on Matlab and Advisor. A rule-based control strategy is designed and finely tuned for the coaxial power-split hybrid powertrain. Then, using the Chinese Transit Bus City Driving Cycle (CTBCDC), the system characteristics and energy efficiencies of the designed coaxial power-split hybrid powertrain with an HESS are analysed. The results indicate that the proposed coaxial power-split hybrid powertrain with an HESS can fulfil the drivability requirement of transit bus and enhance the energy efficiency significantly compared with a conventional powertrain bus as well as reduce the battery stress simultaneously. Using an HESS is a good solution for the coaxial power-split hybrid transit bus.

Part of the book: Hybrid Electric Vehicles

Performance Evaluation and Control Strategy Comparison of Supercapacitors for a Hybrid Electric Vehicle

By Enhua Wang, Minggao Ouyang, Fujun Zhang and Changlu Zhao

Electrification of powertrain system is a great technical progress of traditional vehicle, leading to a significant reduction of fuel consumption and emission pollution. Energy storage system (ESS) normally consisting of batteries is a key component of an electric vehicle or hybrid electric vehicle. An ESS can recover braking energy during the regenerative braking process. Currently, lithium-ion batteries are the main energy storage device due to their high energy density. However, sometimes, a sudden large increase of operation current is required during acceleration or regenerative braking processes, which will jeopardize the operation life of batteries. A supercapacitor takes advantage of high power density and can tolerate large current in a short time. Application of supercapacitor in an ESS can reduce the peak current of batteries effectively, and the life time of batteries can be extended. Meanwhile, the braking energy can also be recovered sufficiently. Supercapacitors can be used solely in some hybrid electric vehicles. In this chapter, the application of supercapacitors in electric vehicles or hybrid electric vehicles is reviewed briefly. Then, the performance of a series hybrid transit bus, which uses a compressed natural gas engine and supercapacitors as power sources, is analyzed.

Part of the book: Science, Technology and Advanced Application of Supercapacitors

Investigation on Internal Short Circuit Identification of Lithium-Ion Battery Based on Mean-Difference Model and Recursive Least Square Algorithm

By Xu Zhang, Yue Pan, Enhua Wang, Minggao Ouyang, Languang Lu, Xuebing Han, Guoqing Jin, Anjian Zhou and Huiqian Yang

Electric vehicles powered by lithium-ion batteries take advantages for urban transportation. However, the safety of lithium-ion battery needs to be improved. Self-induced internal short circuit of lithium-ion batteries is a serious problem which may cause battery thermal runaway. Accurate and fast identification of internal short circuit is critical, while difficult for lithium-ion battery management system. In this study, the influences of the parameters of significance test on the performance of an algorithm for internal short circuit identification are evaluated experimentally. The designed identification is based on the mean-difference model and the recursive least square algorithm. First, the identification method is presented. Then, two characteristic parameters are determined. Subsequently, the parameters of the significance calculation are optimized based on the measured data. Finally, the effectiveness of the method for the early stage internal short circuit detection is studied by an equivalent experiment. The results indicate that the detection time can be shortened significantly via a proper configuration of the parameters for the significance test.

Part of the book: Applied Electromechanical Devices and Machines for Electric Mobility Solutions

Knock Suppression of a Spark-Ignition Aviation Piston Engine Fuelled with Kerosene

By Enhua Wang, Chenyao Wang, Fujun Zhang, Huasheng Cui, Chuncun Yu, Bolan Liu, Zhenfeng Zhao and Changlu Zhao

Spark-ignition (SI) engine has a high power density, making it suitable for unmanned aerial vehicles. Normally, gasoline fuel with a high octane number (ON) is used for a spark-ignition engine. However, gasoline fuel is easy to be evaporated and has a low flash point which is unsafe for aviation engines. Kerosene with a high flash point is safer than gasoline. In this chapter, the combustion characteristics of kerosene for a spark-ignition aviation piston engine are analyzed. A three-dimensional (3D) model is setup, and the combustion process of the engine fuelled with kerosene is simulated. Later, the knock limit extension by water injection is evaluated experimentally. The results indicate that water injection can suppress the knock of SI engine with kerosene in some extent and the output power can be improved significantly.

Part of the book: Numerical and Experimental Studies on Combustion Engines and Vehicles

Enhua Wang

Latest work with IntechOpen by Enhua Wang

Internal Combustion Engine Technology and Applications of Biodiesel Fuel

Books edited

Organic Rankine Cycle Technology for Heat Recovery

Chapters authored

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