Effect of instantaneous rotational speed on the analysis of measured diesel engine cylinder pressure data

Antonopoulos, AK; Hountalas, DT

dc.contributor.author	Antonopoulos, AK	en
dc.contributor.author	Hountalas, DT	en
dc.date.accessioned	2014-03-01T02:53:37Z
dc.date.available	2014-03-01T02:53:37Z
dc.date.issued	2012	en
dc.identifier.issn	01968904	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36449
dc.subject	Crank angle encoder	en
dc.subject	Cylinder pressure	en
dc.subject	Heat release rate	en
dc.subject	Indicated mean effective pressure	en
dc.subject	Instantaneous engine speed	en
dc.subject.other	Crank angle	en
dc.subject.other	Cylinder pressures	en
dc.subject.other	Engine speed	en
dc.subject.other	Heat Release Rate (HRR)	en
dc.subject.other	Indicated mean effective pressure	en
dc.subject.other	Diesel engines	en
dc.subject.other	Engine cylinders	en
dc.title	Effect of instantaneous rotational speed on the analysis of measured diesel engine cylinder pressure data	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/j.enconman.2012.01.020	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enconman.2012.01.020	en
heal.publicationDate	2012	en
heal.abstract	Diesel engine cylinder pressure measurements are widely used in field and lab applications to support among other control, monitoring and diagnostic applications. There are two methods to measure cylinder pressure, the use of a crank angle encoder, which guarantees pressure samples at fixed crank angles, and the use of constant time sampling rate. The last is frequently used due to its simplicity or because of practical restrictions. However, in order to perform thermodynamic calculations it is necessary to attribute a crank angle value to each measured pressure value. But if the in-cycle rotational speed fluctuates and this is neglected, an error will result in the values derived from the processing of the measured cylinder pressure. For this reason in the present work an experimental investigation is conducted on a single cylinder diesel test engine to identify the aforementioned problem. During the tests cylinder pressure and instantaneous speed were recorded using an accurate crank angle reference. These where then used to simulate the measurement of cylinder pressure digitized using a fixed time step. The comparison of the two cylinder pressure traces and the thermodynamic parameters derived from them, reveals the introduction of an error which depends on engine load and speed. © 2012 Elsevier Ltd. All rights reserved.	en
heal.journalName	Energy Conversion and Management	en
dc.identifier.doi	10.1016/j.enconman.2012.01.020	en
dc.identifier.volume	60	en
dc.identifier.spage	87	en
dc.identifier.epage	95	en