liu.seSök publikationer i DiVA
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Requirements for and a Systematic Method for Identifying Heat-Release Model Parameters
Linköpings universitet, Institutionen för systemteknik, Fordonssystem. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0001-8646-8998
1998 (Engelska)Ingår i: SAE technical paper series, ISSN 0148-7191, Vol. 107, s. 898-908Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Heat release analysis by using a pressure sensor signal is a well recognized technique for evaluation of the combustion event, and also for combustion diagnostics. The analysis includes tuning of several parameters in order to accurately explain measured data. This work presents and investigates a systematic method for estimating parameters in heat release models and minimizing the arbitrary choices. In order for the procedure to be systematic there are also the requirements on the model, that it includes no inherent ambiguities, like over-parameterization with respect to the parameters and to the information contained in the measurements. The fundamental question is which parameters, in the heat release model, that can be identified by using only cylinder pressure data. The parameter estimation is based on established techniques, that constructs a predictor for the model and then minimizes a least-squares objective function of the prediction error. The study is performed on data measured on a SAAB 2.3 liter, four stroke four cylinder, normally aspirated, gasoline engine.

Ort, förlag, år, upplaga, sidor
1998. Vol. 107, s. 898-908
Nyckelord [en]
Engine Estimation
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:liu:diva-137246DOI: 10.4271/980626Scopus ID: 2-s2.0-79961060087OAI: oai:DiVA.org:liu-137246DiVA, id: diva2:1094311
Anmärkning

SAE Techincal Paper Number 980626

Tillgänglig från: 2017-05-09 Skapad: 2017-05-09 Senast uppdaterad: 2021-12-16Bibliografiskt granskad
Ingår i avhandling
1. Spark Advance Modeling and Control
Öppna denna publikation i ny flik eller fönster >>Spark Advance Modeling and Control
1999 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The spark advance determines the efficiency of spark-ignited (SI) engines by positioning the combustion in relation to the piston motion. Today's spark-advance controllers are open loopsystems that measure parameters that effect the spark-advance setting and compensate for their effects. Several parameters influence the best spark-advance setting but it would be too expensive to measure and account for all of them. This results in a schedule that is a compromise since it has to guarantee good performance over the range of all the nonmeasured parameters. A closed-loop scheme instead measures the result of the actual spark advance and maintains an optimal spark-advance setting in the presence of disturbances. To cover this area two questions must be addressed: How to determine if the spark advance is optimal and how it can be measured? This is the scope of the present work.

One possible measurement is the in-cylinder pressure, which gives the torque, but also contains important information about the combustion. The cylinder pressure can accurately be modeled using well known single-zone thermodynamic models which include the loss mechanisms of heat transfer and crevice flows. A systematic procedure for identifying heatrelease model parameters is presented.

Three well-known combustion descriptors have been presented in the literature that relate the phasing of the pressure signal to the optimal ignition timing. A parametric study was performed showing how changes in model parameters influence the combustion descriptors at optimum ignition timing.

Another possible measurement is the ionization current that uses the spark plug as a sensor, when it is not used for ignition. This is a direct in-cylinder measurement which is rich in information about the combustion. A novel approach to spark-advance controlis presented, which uses the ionization current as a sensed variable. The feedback control scheme is closely related to schemes based on in-cylinder pressure measurements, that earlier have reported good results. A key idea in this approach is to fit a model to the measured ionization current signal, and extract information about the peak pressure position from the model parameters.

The control strategy is validated on an SI production engine, demonstrating that the spark-advance controller based on ionization current interpretation can control the peak pressure position to desired positions. A new method to increase engine efficiency is presented,by using the closed-loop spark-advance control strategy in combination with active water injection. However, the major result is that the controller maintains an optimal spark advance under various conditions and in the presence of environmental disturbances such as air humidity.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University, 1999. s. 20
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 580
Nationell ämneskategori
Annan maskinteknik
Identifikatorer
urn:nbn:se:liu:diva-181863 (URN)9172194790 (ISBN)
Disputation
1999-05-12, ISY:s seminarierum, B-huset, Linköpings universitet, Linköping, 10:15
Tillgänglig från: 2021-12-16 Skapad: 2021-12-16 Senast uppdaterad: 2021-12-16Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Person

Eriksson, Lars

Sök vidare i DiVA

Av författaren/redaktören
Eriksson, Lars
Av organisationen
FordonssystemTekniska fakulteten
I samma tidskrift
SAE technical paper series
Elektroteknik och elektronik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 279 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf