Methodology for processing pressure traces used as inputs for combustion analyses in diesel engines
Rašić, Davor (Author), Vihar, Rok (Author), Žvar Baškovič, Urban (Author), Katrašnik, Tomaž (Author)

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This study proposes a novel methodology for designing an optimum equiripple finite impulse response (FIR) filter for processing in-cylinder pressure traces of a diesel internal combustion engine, which serve as inputs for high-precision combustion analyses. The proposed automated workflow is based on an innovative approach of determining the transition band frequencies and optimum filter order. The methodology is based on discrete Fourier transform analysis, which is the first step to estimate the location of the pass-band and stop-band frequencies. The second step uses short-time Fourier transform analysis to refine the estimated aforementioned frequencies. These pass-band and stop-band frequencies are further used to determine the most appropriate FIR filter order. The most widely used existing methods for estimating the FIR filter order are not effective in suppressing the oscillations in the rate-of-heat-release (ROHR) trace, thus hindering the accuracy of combustion analyses. To address this problem, an innovative method for determining the order of an FIR filter is proposed in this study. This method is based on the minimization of the integral of normalized signal-to-noise differences between the stop-band frequency and the Nyquist frequency. Developed filters were validated using spectral analysis and calculation of the ROHR. The validation results showed that the filters designed using the proposed innovative method were superior compared with those using the existing methods for all analyzed cases.

Keywords:diesel engines, FIR filters, harmonics, spectral analyses
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Number of pages:str. 1-22
Numbering:Vol. 28, iss. 5
ISSN on article:0957-0233
DOI:10.1088/1361-6501/aa5f9e Link is opened in a new window
COBISS.SI-ID:15304475 Link is opened in a new window
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Record is a part of a journal

Title:Measurement science & technology
Shortened title:Meas. sci. technol.
Publisher:IOP Publishing
COBISS.SI-ID:6000901 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0401
Name:Energetsko strojništvo

Secondary language

Keywords:dizelski motorji, FIR filtri, harmoniki, spektralna analiza

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