摘要
为了解决柴油机发生喷油故障时喷油器受扰动引起的弹性压缩脉冲发生变化,缸盖受激产生的振动也随之变化的问题,提出了一种通过测量柴油机缸盖振动信号间接诊断喷油故障的方法。首先以5 kHz为截止频率对振动观测信号进行高通滤波,减弱燃爆振动信号的干扰。然后利用等角度重采样的方法,将信号从时域变换到角域,消除转速波动对信号处理的影响。由于滤波后振动观测信号受其他非白噪声的干扰,最后利用自适应平行因子(PARAFAC)方法对振动观测信号进行盲源分离,减弱非白噪声的影响。以压缩上止点附近缸盖振动信号的能量作为特征量,对柴油机喷油故障进行诊断,应用研究表明,该方法有效地诊断出了柴油机喷油故障。
To solve the change of elastic ally compressed pulse disturbed by fuel injector and the vibration of cylinder head when the fuel injection fault of diesel engine happens, a method for diagnosing fuel in- jection fault by measuring the vibration of the diesel engine cylinder head is presented. Firstly, the high pass filtering method is used to reduce the combustion vibration signal interference under the cut off fre- quency of 5 kHz. Then, by using the constant angle resamples, the signal is transferred from time domain to angle domain to eliminate the effect of speed fluctuation on signal processing. Finally, since the fil- tered signal is disturbed by other non-white noise, the method of PARAFAC is applied to separate signals to reduce the influence of non-white noise. The fuel injection fault of diesel engine is diagnosed by taking the energy of cylinder head vibration nearby top dead center as feature value. The result shows that this method could be used to diagnose the fuel injection fault of diesel engine effectively.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2013年第5期519-526,共8页
Acta Armamentarii
关键词
动力机械工程
柴油机喷油故障
等角度重采样
自适应平行因子
power machinery engineering
fuel injection fault of diesel engine
constant angle resample
adaptive parallel factor
