Combustion Monitoring Based on Engine Acoustic Emission Signal Processing

2009-01-1024

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
The paper presents the development of a real-time engine combustion monitoring system, based on direct measurement of engine acoustic emission, for on-board application.
Acoustic emission contains information about several processes taking place within the engine. The combustion process could in fact be monitored by real time processing acoustic data, and also other features related to engine operation are contained in the very same signal (such as valve closing events, and both engine and turbocharger speed). The paper describes the development of real-time signal processing algorithms that could be integrated in the actual ECU software, in order to improve combustion diagnosis and control by extracting in-cylinder pressure rise rate information from the overall engine noise. In particular, the ability to effectively reconstruct in-cylinder pressure rise rate under all engine operating conditions would allow for a closed-loop combustion control system. Since the combustion acoustic emission signal to noise ratio may become particularly low, the paper shows that combustion quality may still be roughly recovered, thus providing information that can be used to monitor and diagnose abnormal combustion modes, such as knocking and misfiring (or partial burns).
Experimental tests have been carried out in a test-cell environment. Knocking and misfiring were externally induced, in order to evaluate the signal processing algorithms performance.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-1024
Pages
10
Citation
Cavina, N., Sgatti, S., Cavanna, F., and Bisanti, G., "Combustion Monitoring Based on Engine Acoustic Emission Signal Processing," SAE Technical Paper 2009-01-1024, 2009, https://doi.org/10.4271/2009-01-1024.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-1024
Content Type
Technical Paper
Language
English