Combustion parameter estimation for ICE from surface vibration using frequency spectrum analysis. (November 2018)

• Record Type: Journal Article
• Authors: Ji, Shaobo; Lan, Xin; Lian, Jing; Wang, Hao; Li, Meng; Cheng, Yong; Yin, Wei
• Is Part Of: Measurement. Volume 128(2018)
• Page Start: 485
• Page End: 494
• Publication Date: 2018-11
• Subjects: ICE internal combustion engine -- SI spark ignition -- EMD empirical mode decomposition -- IMF intrinsic mode function -- PIR pressure rise rate -- MSC morlet scalogram -- FFT Fast Fourier Transform -- GDI gasoline direct injection -- Ttq torque -- n speed -- θ fuel injection advance angle -- CA crank angle -- Cxy(f) coherence coefficient -- BTDC before top dead center -- θig start of combustion -- TDC top dead center -- ATDC after top dead center; High power engine -- Combustion analysis -- Vibration acceleration signal -- Frequency spectrum analysis -- Time-frequency analysis; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2018.07.002
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: S-Transform was adopted to improve frequency resolution for high power engine. Frequency characteristics of acceleration was influenced by combustion and transfer performance of the engine. Relationship between spectrum energy and combustion was analyzed. Summation of spectrum could be used to estimate combustion with constant speed working condition. Abstract: Surface vibration of internal combustion engine containing abundant combustion information could be analyzed using different signal processing methods, in which frequency-domain analysis is one of the common methods. In order to eliminate influence of adjacent excitation and enhance frequency resolution, S-Transform method was used to obtain frequency information of combustion pressure and surface vibration signal measured from a single-cylinder and 12-cylinder diesel engine. Based on the results of the single-cylinder diesel engine, the relationship between frequency information of vibration acceleration and characteristics parameters of combustion like peak combustion pressure and peak pressure rise rate was analyzed. It could be concluded that there existed a good linear relationship between the summation of frequency amplitude in the selected frequency range and the characteristics parameters under the same engine speed working condition. Frequency-domain analysis conducted with the 12-cylinder engine showed that characteristics parameters of combustion could be estimated from the summation of frequency amplitude when engine worked for power generation application, which was maintained the same engine speed normally.