Papers by Author: Su Zhou

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Authors: Feng Lai Pei, Zhuang Yun Li, Su Zhou
Abstract: The study of Proton Exchange Membrane Fuel Cell (PEMFC) faults mechanism and diagnosis can afford theoretical and technical supports for the future mass production and applications of PEMFC stacks and systems, which need modularization and high reliability. Most of the existing fault diagnosis methodologies, such as Cell Voltage Monitoring (CVM) method, require the knowledge of numerous parameters which may lead to a special inner parameter monitoring setup. The corresponding devices increase the cost and are not suitable for stack modularization and system application. In this paper, a simple and low-cost PEMFC faults diagnosis method using discrete wavelet transform is described. The method only uses the stack information for signal feature extraction. After that, by faults identification and classification, several typical faults including temperature fault, inlet flow inefficiently supplying fault and membrane dehydration fault have been distinguished. A semi-empirical distributed parameter stack model is employed for simulating typical faults that may occur. The simulation results demonstrate that the application of wavelet theory to PEMFC diagnosis is feasible, reliable and promising.
Authors: Ji Gao Niu, Su Zhou
Abstract: This paper presents a Fuzzy Logic Control Strategy (FLCS) for an Extended-range Electric Vehicle (E-REV) with series structure. The control strategy design objective of the E-REV is fuel economy. Based on the State of Charge (SOC) of the battery and the desired power for driving, the power required by the vehicle is split between the engine/generator set and the battery by the FLCS. The engine can be operated consistently in a very high efficiency area and the SOC of the battery can be maintained at a reasonable level. Some standard driving cycles and two control strategies of Power Follower Control Strategy (PFCS) and FLCS were simulated with AVL-Cruise and Matlab/Simulink to analyze the vehicle performance. Some simulation results are compared and discussed: the FLCS indicates better performance in terms of fuel consumption.
Authors: Ji Gao Niu, Feng Lai Pei, Su Zhou, Tong Zhang
Abstract: A new method based on genetic-particle swarm hybrid algorithm was presented for parameter optimization of energy management strategy for extended-range electric vehicle (E-REV). Taking a logic threshold control strategy of an E-REV as example, for the aims of minimizing fuel consumption and emissions, a constrained nonlinear programming parameter optimization model was established. Based on this model, genetic algorithm (GA) and particle swarm optimization (PSO) were improved respectively. Further, a genetic-particle swarm hybrid algorithm was put forward and applied to the multi-objective optimization of E-REV energy management strategy. Optimization results show that the hybrid optimization algorithm can avoid falling into local optimum and its search ability is much better than improved adaptive genetic algorithm (IAGA). This hybrid algorithm is also suitable for the control parameters optimization issues of other types of hybrid electric vehicles.
Authors: Su Zhou, Lan Zheng, Feng Xiang Chen, Shuang Zhai
Abstract: Cold start is a necessary function for PEMFC systems. In order to investigate the water freezing and thawing process inside PEMFC stack under subzero temperature, a 2-D transient model containing 40 cells has been developed. This model approximately estimates freezing and thawing time of each cell and shows the spatial distribution of water and ice for the purpose of analyzing the differences between single cells as well. As simulation examples, two processes under 260K ambient temperature have been studied in this paper and the results show as follows: (1)after the stack shut down, first of all, the outermost layer cell of the stack freezes before the inside cells and the freezing duration of each cells is almost the same, secondly, the freezing interval time of the outer cells is longer than the inside cells and the innermost cells almost freeze at the same time; (2) before the stack start up, heating up the membrane under two situations, one with the residual water inside and the other one has been purged after it shut down, the temperature rise of the stack with water is slower than that without water, this result indicates that the residual water would influence the cold start process.
Authors: Feng Xiang Chen, Shuang Zhai, Guang Ji Ji, Lin Jiong Yu, Su Zhou, Tong Zhang
Abstract: This paper treats the chaos synchronization problem of uncertain chaotic Chua circuit system. Based on Lyapunov theory, the proposed controller is featured with (a) only single variable information of the master system is needed; (b) the synchronization can also be achieved whilst the parameters of the master system are perturbed. Finally, the effectiveness of the proposed control law is also illustrated by the numerical simulation on Matlab environment.
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