Article
Thermodynamics
Changyin Wei, Yong Chen, Xiaoyu Li, Xiaozhe Lin
Summary: This paper proposes an adaptive equivalent consumption minimization strategy for extender range electric logistics vehicles, which aims to improve fuel economy and optimize power allocation. By combining driving pattern recognition and state-of-charge reference planning, the proposed method can adjust control actions in real time, leading to significant reduction in energy consumption and battery power transients.
Article
Energy & Fuels
Limin Wu, Huihua Feng, Ziwei Zhang, Boru Jia, Jiayu Wang, Fengyuan Yang, Qiming Lei
Summary: The opposed-piston free piston engine generator (FPEG) is a novel energy conversion device with high efficiency, density, low loss, and excellent performance. Through systematic analysis of key parameters, suitable values have been determined, and the stable operation mechanism and synchronization error of the system have been analyzed.
Article
Thermodynamics
Hadi Taghavifar
Summary: The study analyzed and compared the potential of E-transportation technology in phasing out internal combustion engines. Results showed significant improvements in mileage, fuel consumption, and emissions reduction in hybrid mode compared to traditional ICE alone mode.
Article
Thermodynamics
Shuangshuang Liu, Zhaoping Xu, Leiming Chen, Liang Liu
Summary: This paper investigates a single-channel structure for a free-piston engine and compares spray, combustion, emissions, and energy balance using computational fluid dynamics simulations. The results show that the engine with a single-channel structure has improved combustion efficiency, reduced combustion duration, and lower emissions.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Jian Feng, Zhiyu Han, Zhenkuo Wu, Minqing Li
Summary: A new equivalent consumption minimization strategy (ECMS) is proposed for a hybrid electric vehicle, which dynamically adjusts the equivalent factor based on speed and optimizes fuel economy and battery performance using neural network and fuzzy logic controller. The simulated results show that the strategy improves fuel economy while reducing peak battery charging and discharging currents, leading to better battery SOC evolution.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Thermodynamics
Fengyuan Yang, Huihua Feng, Limin Wu, Zhiyuan Zhang, Jiayu Wang
Summary: This paper introduces a novel approach to predict the performance of opposed-piston FPEG and demonstrates the significant enhancement in overall system performance through modeling, analysis of key factors, and parameter optimization.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Feng Wang, Zichang Lin, Jiaqi Li, Chen Zhang, Jin Xiao, Bing Xu
Summary: This study proposes a series hybrid powertrain based on a free piston engine generator (FPEG) for wheel loaders to reduce fuel consumption. Results show that compared to conventional internal combustion engine (ICE) systems, the proposed FPEG-based system reduces fuel consumption by 10.5% and improves the average efficiency of the wheel loader powertrain to 35.1%.
Article
Chemistry, Physical
Ugochukwu Ngwaka, Andrew Smallbone, Boru Jia, Christopher Lawrence, Ben Towell, Sumit Roy, K. Shivaprasad, Anthony Paul Roskilly
Summary: The experimental results show that equivalence ratio and engine speed affect engine operation characteristics, and it is important to avoid unwanted disturbance to the electric generator operation. The four-stroke cycle mode has a higher indicated thermal efficiency compared to the two-stroke cycle mode.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Yaoyuan Zhang, Haoqing Wu, Shijie Mi, Wenbin Zhao, Zhuoyao He, Yong Qian, Xingcai Lu
Summary: This study investigates the optimal application of the dual-fuel intelligent charge compression ignition (ICCI) engine on hybrid powertrains, achieving global optimization in fuel consumption and emissions. The results indicate that power-split (PSHEV) hybrid electric vehicles achieve the best fuel economy and emission purification among the studied structures.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Mechanical
Yongzheng Sun, Zhiyu Han, Jian Feng, Zhenkuo Wu
Summary: This paper proposes a range-extender in-the-loop (REIL) method to predict vehicle fuel consumption more accurately. By integrating the vehicle plant model, electric-drive control strategy, and range-extender control strategy, a vehicle control unit (VCU) is developed for range-extender control. Experimental verification is conducted to validate the REIL method.
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
(2023)
Article
Energy & Fuels
Jose Ramon Serrano, Antonio Garcia, Javier Monsalve-Serrano, Santiago Martinez-Boggio
Summary: This study evaluates the potential of reducing vehicle CO2 emissions and costs by applying a new opposed piston 2-stroke engine in a series PHEV architecture on different driving routes in Europe. The results show that 24 kWh is the optimum battery size for both vehicle platforms, and significant emission reductions can be achieved under different driving modes and battery states of charge.
Article
Chemistry, Physical
Jianbing Gao, Guohong Tian, Chaochen Ma, Yuanjian Zhang, Shikai Xing, Phil Jenner
Summary: Lean-burn was adopted as an effective method in this study to reduce NOx emissions from hydrogen combustion in ORP engines. The equivalence ratio has a significant impact on combustion and NOx emission characteristics, with effects varying with engine speeds. High NOx emissions were observed under low engine speed conditions due to hydrogen combustion near stoichiometric ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Peter R. Hooper
Summary: This article presents a low-emission two-stroke engine of in-line three-cylinder format and compares it with an equivalent four-stroke engine, focusing on strategies for minimizing noise, vibration, and harshness, as well as the arrangement of a balance shaft system to further reduce these issues. The design showcases an integrated induction control/balance shaft arrangement that eliminates the usual cost penalties associated with balance shaft consideration in three-cylinder engines.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Thermodynamics
Limin Wu, Huihua Feng, Boru Jia, Zhifeng Tang, Xiaodong Yan, Wei Wang
Summary: This paper introduces a novel method combining low frequency operation test with high frequency operation simulation to study the generation performance of a linear generator, analyzing the influences of operation frequency, stroke, power angle, and load current on the generation performance. The results indicate that the generator can reach a power output of 5 kW with an efficiency higher than 80% under the rated condition of the opposed-piston FPEG.
Article
Energy & Fuels
Limin Wu, Huihua Feng, Ziwei Zhang, Zhifeng Tang, Boru Jia, Xiaodong Yan
Summary: The study focuses on the starting process of opposed-piston FPEG, presenting two novel general methods to start it using a linear electric machine. Both control strategies, displacement master-slave and current master-slave, are feasible for starting the opposed-piston FPEG, with the current master-slave strategy showing faster response to external interference and smaller synchronization error.