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Using hypothesis testing theory to evaluate principles for leakage diagnosis of automotive engines
Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering.
2003 (English)In: Control Engineering Practice, ISSN 0967-0661, E-ISSN 1873-6939, Vol. 11, no 11, 1263-1272 p.Article in journal (Refereed) Published
Abstract [en]

Two different methods for diagnosing leakages in the air path of an automotive engine are investigated. The first is based on a comparison between measured and estimated air flows. The second is based on an estimation of the leakage area. The two methods are compared by using a framework of hypothesis testing and especially the power function. The investigation is made first in theory and then also on a real engine. The conclusion is that the principle based on the estimated leakage area, gives a better power function and is therefore the best choice if only leakage detection is considered. However, if also other faults need to be diagnosed, it is shown that the sensitivity to these other faults may be better with the principle based on comparison of estimated and measured air flow. © 2003 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2003. Vol. 11, no 11, 1263-1272 p.
Keyword [en]
Fault diagnosis, Fault isolation, Hypothesis testing, Statistics
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-46449DOI: 10.1016/S0967-0661(02)00239-3OAI: oai:DiVA.org:liu-46449DiVA: diva2:267345
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Nyberg, Mattias

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