Validation of a diagnostic method for estimating the compression condition of direct injection diesel engines

Lamaris, VT; Hountalas, DT

dc.contributor.author	Lamaris, VT	en
dc.contributor.author	Hountalas, DT	en
dc.date.accessioned	2014-03-01T01:34:50Z
dc.date.available	2014-03-01T01:34:50Z
dc.date.issued	2010	en
dc.identifier.issn	0957-6509	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20883
dc.subject	compression condition	en
dc.subject	diagnostic technique	en
dc.subject	diesel engines	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	Advanced diagnostics	en
dc.subject.other	Blow-by	en
dc.subject.other	compression condition	en
dc.subject.other	Compression ratios	en
dc.subject.other	Compression stroke	en
dc.subject.other	Cylinder tests	en
dc.subject.other	Diagnostic methods	en
dc.subject.other	Diagnostic techniques	en
dc.subject.other	Direct injection diesel engines	en
dc.subject.other	Engine operations	en
dc.subject.other	Experimental investigations	en
dc.subject.other	Initial pressure	en
dc.subject.other	Inlet valve closure	en
dc.subject.other	Normal operations	en
dc.subject.other	Peak compression	en
dc.subject.other	Stationary applications	en
dc.subject.other	Test case	en
dc.subject.other	Engine cylinders	en
dc.subject.other	Inertial confinement fusion	en
dc.subject.other	Marine applications	en
dc.subject.other	Marine engines	en
dc.subject.other	Diesel engines	en
dc.title	Validation of a diagnostic method for estimating the compression condition of direct injection diesel engines	en
heal.type	journalArticle	en
heal.identifier.primary	10.1243/09576509JPE840	en
heal.identifier.secondary	http://dx.doi.org/10.1243/09576509JPE840	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The compression stroke is an important index for engine operation because in-cylinder conditions at the end of compression have a major effect on its overall performance and efficiency. It is widely recognized that the compression stroke is strongly affected, beyond heat losses, by the initial pressure at inlet valve closure, the compression ratio (CR), and the blow-by rate. However, when a compression degradation is detected (i.e. decrease in peak compression pressure), it is very difficult to directly define the actual cause for this. In the present work, an advanced diagnostic technique is used to estimate the compression condition of a direct injection diesel engine and determine the actual cause for a reduction in peak compression pressure. To validate the proposed technique, a detailed experimental investigation was conducted on a single-cylinder test engine installed in the author's laboratory. At first, measurements were taken during the engine's normal operation (i.e. firing and motoring conditions). Then, 'virtual' faults have been created on the engine (i.e. reduced CR, cylinder mass leakage increase, and inlet chocking), aiming to reduce the peak compression pressure. The diagnostic technique is applied for each test case to estimate the cylinder compression condition and to detect the actual parameter that causes a decrease in peak compression pressure. The diagnosis results reveal that the technique can determine correctly the actual parameter responsible for compression deterioration in each case. This is accomplished even in cases where a combination of faults exists. The results obtained are extremely valuable, because the proposed diagnostic technique can be applied to any type of diesel engine and mainly to large-scale diesel engines (i.e. marine or stationary applications), where the application of non-catastrophic methods (i.e. without modifications or interventions to the engine cylinder) for estimating the cylinder compression conditions is extremely important. © 2010 Authors.	en
heal.publisher	PROFESSIONAL ENGINEERING PUBLISHING LTD	en
heal.journalName	Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy	en
dc.identifier.doi	10.1243/09576509JPE840	en
dc.identifier.isi	ISI:000278998900005	en
dc.identifier.volume	224	en
dc.identifier.issue	4	en
dc.identifier.spage	517	en
dc.identifier.epage	532	en