liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
An Investigation of Maximum Brake Torque Timing based on Ionization Current Feedback
Linköping University, Department of Electrical Engineering.
2007 (English)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesisAlternative title
Tändningstidpunkt för Maximalt Arbete baserat på Jonströmsåterkoppling (Swedish)
Abstract [en]

For every operating condition of an internal combustion engine there exists an optimal spark timing, called maximum brake torque (MBT), which maximises the output torque and the efficiency of the engine. Traditionally MBT timing is implemented as an open-loop control where the ignition timing is found by using a combination of static lookup tables and sensor information. With a direct closed-loop control from the combustion process the performance of internal combustion engines could be improved. The thesis investigates if it is possible to estimate the MBT timing from the ionization current for every operating condition of a spark ignited engine where the operating conditions are defined by the engine parameters lambda, internal exhaust gas recirculation, engine load, engine speed and spark advance.

First an investigation of how much loss of torque an error from the MBT position corresponds to is made. Then the influence of the engine parameters on the shape of the ionization current was studied. Last different peak pressure position (PPP) estimating algorithms are presented and a new technique is developed where an engine operating point dependant part of the ionization current is used depending on the current operating condition of the engine. Two of the presented PPP estimating algorithms are then complemented with this technique and the results look promising.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2007. , 50 p.
Keyword [en]
MBT timing, maximum brake torque, spark advance, PPP
Keyword [sv]
tändningstidpunkt, maximalt arbete, MBT, jonström, jonströmsåterkoppling, PPP
National Category
Vehicle Engineering
URN: urn:nbn:se:liu:diva-9506ISRN: LITH-ISY-EX--06/3809--SEOAI: diva2:23960
2007-04-13, Algoritmen, Bhuset, 58183 Linköping, Linköping University, 13:00
Available from: 2007-07-10 Created: 2007-07-10

Open Access in DiVA

fulltext(2209 kB)3005 downloads
File information
File name FULLTEXT01.pdfFile size 2209 kBChecksum MD5
Type fulltextMimetype application/pdf

By organisation
Department of Electrical Engineering
Vehicle Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3005 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: 2096 hits
ReferencesLink to record
Permanent link

Direct link