To improve high-speed road feel and enhance energetic efficiency of hydraulic power steering(HPS) system in heavy-duty vehicles, an electromagnetic slip coupling(ESC) was applied to the steering system, which regulate...To improve high-speed road feel and enhance energetic efficiency of hydraulic power steering(HPS) system in heavy-duty vehicles, an electromagnetic slip coupling(ESC) was applied to the steering system, which regulated discharge flow of steering pump to realize variable assist characteristic as well as uniquely transfer on-demand power from engine to steering pump. The model of ESC was established and the dynamic characteristics of ESC were presented by the way of simulation and experiment. Upon the layout of the assist characteristics, output torque of ESC was derived. Based on the ESC model, the output torque characteristics of ESC were simulated under steering situation and straight driving situation, respectively. The consistency of simulated ESC output torque and the one deduced from assist characteristics verifies the correctness of the ESC dynamic model. To illustrate energy saving characteristics of ESC-HPS, energy consumption comparison of ESC-HPS and conventional HPS was carried out qualitatively and quantitatively. It follows that the energy consumption of ESC-HPS decreases by 50% compared with that of HPS.展开更多
Layered solid solution material Li1.2Ni0.2Mn0.6O2 is synthesized and the AlF3 is added to improve the electrochemical performance.X-ray diffraction（XRD） results show that the Li1.2Ni0.2Mn0.6O2 samples exhibit layere...Layered solid solution material Li1.2Ni0.2Mn0.6O2 is synthesized and the AlF3 is added to improve the electrochemical performance.X-ray diffraction（XRD） results show that the Li1.2Ni0.2Mn0.6O2 samples exhibit layered characteristics.The AlF3 additive is detected by transmission electron microscope（TEM） technology.The electrochemical tests show that Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added delivers better discharge capacity （240mA·h/g）,first coulomb efficiency 79.2%,cyclic performance（capacity retention ratio of 100.6%after 50 cycles）,and rate capacity（68mA·h/g at 10 capacity（C）） than the pristine sample.Electrochemical impedance spectroscopy（EIS） results show that the charge transfer resistance of Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added increases slower than that of pristine Li1.2Ni0.2Mn0.6O2 after cycling,which is responsible for better cyclic and rate performance.展开更多
基金Project(51275211)supported by the National Natural Science Foundation of ChinaProject(11KJA580001)supported by the Natural Science Fund for Colleges and Universities in Jiangsu Province,ChinaProject(CXZZ12_0665)supported by the Postgraduate Innovation Natural Science Foundation of Jiangsu Province,China
文摘To improve high-speed road feel and enhance energetic efficiency of hydraulic power steering(HPS) system in heavy-duty vehicles, an electromagnetic slip coupling(ESC) was applied to the steering system, which regulated discharge flow of steering pump to realize variable assist characteristic as well as uniquely transfer on-demand power from engine to steering pump. The model of ESC was established and the dynamic characteristics of ESC were presented by the way of simulation and experiment. Upon the layout of the assist characteristics, output torque of ESC was derived. Based on the ESC model, the output torque characteristics of ESC were simulated under steering situation and straight driving situation, respectively. The consistency of simulated ESC output torque and the one deduced from assist characteristics verifies the correctness of the ESC dynamic model. To illustrate energy saving characteristics of ESC-HPS, energy consumption comparison of ESC-HPS and conventional HPS was carried out qualitatively and quantitatively. It follows that the energy consumption of ESC-HPS decreases by 50% compared with that of HPS.
基金the Postdoctoral Foundation of China (No.2012M511211)the Postdoctoral Foundation of Jiangsu Province(No.1102121C)
文摘Layered solid solution material Li1.2Ni0.2Mn0.6O2 is synthesized and the AlF3 is added to improve the electrochemical performance.X-ray diffraction（XRD） results show that the Li1.2Ni0.2Mn0.6O2 samples exhibit layered characteristics.The AlF3 additive is detected by transmission electron microscope（TEM） technology.The electrochemical tests show that Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added delivers better discharge capacity （240mA·h/g）,first coulomb efficiency 79.2%,cyclic performance（capacity retention ratio of 100.6%after 50 cycles）,and rate capacity（68mA·h/g at 10 capacity（C）） than the pristine sample.Electrochemical impedance spectroscopy（EIS） results show that the charge transfer resistance of Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added increases slower than that of pristine Li1.2Ni0.2Mn0.6O2 after cycling,which is responsible for better cyclic and rate performance.
