Accession Number : AD1035578

Title :   Optimization of In-Cylinder Pressure Filter for Engine Research

Descriptive Note : Technical Report,01 Jun 2016,01 Dec 2016

Corporate Author : US Army Research Laboratory, Vehicle Technology Directorate Aberdeen Proving Ground United States

Personal Author(s) : Kim,Kenneth S ; Szedlmayer,Michael T ; Kruger,Kurt M ; Kweon,Chol-Bum M

Full Text :

Report Date : 01 Jun 2017

Pagination or Media Count : 38

Abstract : Proper filtering of an engines in-cylinder pressure is very important for analyzing combustion events. The objective of this study was to investigate and determine the optimal filter and its parameters for removing signal noise while retaining in-cylinder pressure characteristics of interest, for both normal and abnormal combustion events. A 4-cylinder direct-injection aviation diesel engine was instrumented to acquire in-cylinder pressure with a range of combustion events. Simple smoothing filters showed limited performance for an abnormal combustion event, resulting in biased in-cylinder pressure near start-of-combustion. The Savitzky-Golay filter, one of the simple smoothing filters, determined filtered in-cylinder pressure with high accuracy near start-of-combustion but underperformed in removing signal noise after start-of-combustion. Various linear continuous-time filters with frequency stop-band have advantages over simple smoothing filters in removing signal noise with magnitude response as a function of frequency. A number of linear continuous-time filters with different phase-response characteristics were investigated, and the optimal filter response and parameters were determined to effectively filter in-cylinder pressure of an aviation diesel engine. The Chebyshev filter with 5th-order polynomial and 0.001 -allowed ripples showed the best results in matching the raw signal near start-of-combustion and minimizing oscillations after start-of-combustion.

Descriptors :   compression ignition engines , ignition lag , combustion chambers , measurement , resonant frequency , diesel engines , fuel lines , high pressure , calibration , DIGITAL FILTERS , optimization

Subject Categories : Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE