Change search
ReferencesLink to record
Permanent link

Direct link
Knock Detection in a Two-Stroke Engine to be Used in the Engine Management System
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, The Institute of Technology.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Engine knock has long been a well recognized phenomenon in the automotive industry. Detecting engine knock opens up the possibility for an indirect feedback of the engine's internal combustion without installing a pressure transducer inside the cylinder. Knock detection has mainly been used for spark advance control, making it possible to control the engine close to its knock limit in search for the optimal ignition timing. This application has to a lesser extent been applied to lightweight two-stroke engines, which is the focus of this study. The investigation features a modern chainsaw engine whose knock characteristics were first determined with a pressure transducer. The structural vibrations originating from the engine knock are filtered out of the signal from a remote located accelerometer. The knock intensity is compared with the signal from the pressure transducer which shows a correlation with an accepted extent between the two sensors. Parameters that affect the knock intensity have also been investigated. These include engine temperature, different types of fuel and ignition timings.

Place, publisher, year, edition, pages
2014. , 48 p.
Keyword [en]
knock detection, knock control, lambda control, two-stroke engine, engine control
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:liu:diva-104681ISRN: LiTH-ISY-EX--14/4744--SEOAI: diva2:698453
External cooperation
Husqvarna AB
Subject / course
Vehicular Systems
2014-02-12, Algoritmen, B-huset, Linköpings universitet, Linköping, 10:15 (Swedish)
Available from: 2014-02-24 Created: 2014-02-21 Last updated: 2014-02-24Bibliographically approved

Open Access in DiVA

14_EX_4744_FH(966 kB)282 downloads
File information
File name FULLTEXT01.pdfFile size 966 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Höglund, Filip
By organisation
Vehicular SystemsThe Institute of Technology
Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 282 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 273 hits
ReferencesLink to record
Permanent link

Direct link