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Characteristic analysis of hydraulic hybrid vehicle based on limit cycle

Science China(Technological Sciences) 2012年第4期55卷 1031-1036页

作者： CHEN YanLi LIU ShunAn SHANG Tao ZHANG YuanKun College of Mechanical Science and Engineering Jilin UniversityChangchun 130022China Faculty of Engineering University of WollongongWollongong NSW 2522Australia

The theory of limit cycles was applied to hydraulic hybrid vehicle (HHV) to analyze the dynamic characteristics of the system. The exact mathematical models based on configuration diagram of HHV were built to study on equilibrium points, nonexistence of limit cycle and stability of equilibrium points. The analysis showed that if the Young's modulus of fluid is neglected, the equilibrium points of the system will be distributed on both sides of the initial function. In addition, there is a unique equilibrium point according to the practical signification of the system parameters. The nonexistence analysis showed that there is no limit cycle for the system, no matter how the viscosity coefficient B changes. The stability analysis of equilibrium points showed that the system is asymptotically stable about the equilibrium point at B≥0 and the equilibrium point is the center point of the system at B=0. Finally, the phase diagrams of global topological structure of HHV system were entirely described according to qualitative analysis of the singular points at infinity.

关键词： automotive engineering hydraulic hybrid vehicle limit cycle global structure

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A Study on Parameter Optimization of Parallel hydraulic hybrid vehicle

A Study on Parameter Optimization of Parallel Hydraulic Hybr...

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2010 Chinese Control and Decision Conference

作者： Tao Liu~(1,2),Xiao-hui Zhang~(1,2),Wen-li Yang~3,Guo-quan Fan~3,Yun-fei Wang~3,Ji-hai Jiang~(1,2) 1.Harbin Institute of Technology,Weihai,264209,China 2.The State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou,310027,China 3.R&D Center,China FAW Group Corporation,Changchun,130011,China

＜正＞The parameter optimization for parallel hydraulic hybrid vehicle（PHHV） system has a significant impact on the vehicle dynamic performance,fuel economy and *** this article,several factors affecting system efficiency are used as the objective functions,system parameters are used as the independent variables,and the multi-objective optimization process is compiled in *** process takes the ant colony algorithm as the optimization method,obtains the best system parameters through computing,and verifies the accuracy of optimization results through simulation.

关键词： Parameter optimization Ant colony algorithm hydraulic hybrid vehicle Simulation

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