摘要
增程器失火故障可能导致增程式电动汽车工作性能恶化、续航里程降低以及振动噪声增大等不良后果。通过对增程器轴系的瞬时转速信号进行谐波分析,研究了增程器失火故障的诊断方法。首先,以轴系扭振理论为基础,建立增程器的动力学模型,从理论上分析了不同工况下瞬时转速谐波的变化趋势。然后,搭建了增程器的刚柔混合多体动力学模型,利用仿真实验模拟不同工况下瞬时转速谐波的变化规律。最后,以某柴油发电机组为例进行了单缸失火台架试验,数据分析结果表明瞬时转速的0.5谐次幅值和相位特性可作为增程器失火故障诊断的特征参数。
The range extender misfire fault can result in working performance deterioration,mileage reduction,vibration and noise increase,and other adverse consequence ofrange extended electric vehicle.It was studied the misfire fault diagnosis method by harmonic analysis of the crankshaft instantaneous angle speed(IAS)signals.Firstly,based on the theory of shafting torsional vibration,the range extender dynamics model was developed to analyze the changing trend of the crankshaft IAS theoretically.Then,the variation of crankshaft IAS signal under different working conditions was simulated using a developed range extender rigid-flexible hybrid multi-body dynamics model.At last,it was found that the 0.5-order harmonic amplitude and the phase 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.
作者
许小伟
刘振兴
严运兵
南欣
XU Xiao-wei;LIU Zhen-xing;YAN Yun-bing;NAN Xin(School of Automotive and Traffic Engineering,Wuhan University of Science and Technology,Hubei Wuhan 430065,China)
出处
《机械设计与制造》
北大核心
2020年第10期42-45,共4页
Machinery Design & Manufacture
基金
国家自然科学基金:项目(51505345)—电动汽车增程器耦合故障机理及诊断方法研究。
关键词
增程器
失火故障
故障诊断
谐波分析
多体动力学
Range Extender
Misfire Fault
Fault Diagnosis
Harmonic Analysis
Multi-Body Dynamics
