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MISFIRE FAULT DIAGNOSIS OF RANGE EXTENDER BASED ON HARMONIC ANALYSIS
Xiaowei Xu,Zhenxing Liu,Jiangdong Wu,Jiaming Xing,Xiaoqing Wang 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.1
For an Extended-Range Electric Vehicle (E-REV), the misfire failure of the range extender can result in working condition deterioration, mileage decrease, vibration and noise increase, and other adverse consequences. The relationship of the shaft instantaneous angular speed (IAS) signal and the misfire fault of the range extender was studied by harmonic analysis. Based on the theory of shafting torsional vibration, the range extender dynamics model was developed to analyze the changing trend of the shaft IAS theoretically. Then, the shaft IAS signal under different working conditions was simulated using a developed range extender rigid-flexible hybrid multi-body dynamics model. It is found that the 0.5-order harmonic phase and the amplitude of range extender IAS can be used as the characteristic parameters in misfire fault diagnosis, which has been verified by experiments on an engine bench.
Jixiang Wang,Jianming Pan,Yijie Yin,Runrun Wu,Xiaohui Dai,Jiangdong Dai,Lin Gao,Hongxiang Ou 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
Thermal-responsive and magnetic molecularly imprinted polymers (TMMIPs) based on Fe3O4@carbon (Fe3O4@C) were prepared by free radical polymerization and applied to selective adsorption and controlled release of 2,4,5-trichlorophenol (2,4,5-TCP) from aqueous solution. TMMIPs were composed of multilayer structure, and exhibited magnetic sensitivity, magnetic stability and thermal stability (especially below the. The reversible transform of mean diameter resulted from the change of testing temperature, indicating the thermo-responsive properties of TMMIPs. Selective adsorption and controlled release of 2,4,5-TCP were also investigated at 25 8C and higher temperature (such as 45 8C and 60 8C), respectively.