Effects of Altitude Variation on Cylinder Pressure Signal of Diesel Engine

GAN Qingliang; LIU Zhentao; ZHANG Yu

doi:10.3969/j.issn.1001-2222.2018.02.013

Vehicle Engine ›› 2018, Vol. 0 ›› Issue (2) : 74-78. DOI: 10.3969/j.issn.1001-2222.2018.02.013

Effects of Altitude Variation on Cylinder Pressure Signal of Diesel Engine

GAN Qingliang,LIU Zhentao,ZHANG Yu

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Abstract

For the failure on fire surface of cylinder head for a heavyduty diesel engine at high altitude, the hypothesis that the increase of impulse frequency led by incylinder fluctuation was the failure reason was put forward. Then the incylinder pressure signals at different altitudes were collected at a plateau simulation test bed for a single cylinder engine and the ensemble empirical mode decomposition (EEMD) was conducted. Different frequency components of incylinder signal were extracted and their power spectral densities were carried out in each condition. It was found that the energy of high frequency components increased with the increase of altitude by analyzing energies of extracted different frequency components. Accordingly, the proposed hypothesis was feasible.

Key words

plateau / in-cylinder pressure / pressure fluctuation / signal process / empirical mode decomposition(EMD)

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GAN Qingliang,LIU Zhentao,ZHANG Yu. Effects of Altitude Variation on Cylinder Pressure Signal of Diesel Engine[J]. Vehicle Engine. 2018, 0(2): 74-78 https://doi.org/10.3969/j.issn.1001-2222.2018.02.013