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HCCI Operation - Closed loop combustion control using VVA or dual fuel

Strandh, Petter LU (2006)
Abstract
The current technology within combustion engines have the possibility of handling the more stringent legislative demands on combustion engines. However the required solutions are getting more expensive and technically challenging. One possible way towards a more simple



exhaust aftertreatment system is the use of the Homogeneous Charge Compression Ignition (HCCI) engine cycle. The main advantage of the HCCI engine is its low output of NOx exhaust emissions. Because of its indirect combustion initiation the main disadvantage is that it requires closed loop control of its combustion process. Two methods for engine timing control were used, dual fuels or variable valve actuation(VVA). With dual fuels the timing change was... (More)
The current technology within combustion engines have the possibility of handling the more stringent legislative demands on combustion engines. However the required solutions are getting more expensive and technically challenging. One possible way towards a more simple



exhaust aftertreatment system is the use of the Homogeneous Charge Compression Ignition (HCCI) engine cycle. The main advantage of the HCCI engine is its low output of NOx exhaust emissions. Because of its indirect combustion initiation the main disadvantage is that it requires closed loop control of its combustion process. Two methods for engine timing control were used, dual fuels or variable valve actuation(VVA). With dual fuels the timing change was achieved by changing the autoignition properties of the homogeneous charge and with VVA, timing control was achieved by changing the effective compression ratio.



This thesis focuses on the control of the HCCI engine. For the purpose of studying control of the HCCI engine, special engine control software was developed. This software aimed towards engine cycle-to-cycle control and actuation. Another aid in the development was the use of Matlab/Simulink for the design of powerful control algorithms.



Successful system identification control design has been shown. Different control strategies were tested, amongst the most successful was the use of Model Predictive Control (MPC), which is a control strategy that can take care of the nonlinear behavior of the dynamic engine system and its actuators. It was concluded that low order models were sufficient for capturing the important HCCI engine dynamics.



The use of ion current for detection and control of the HCCI combustion was also shown. A method for obtaining combustion timing from the ion current was defined and investigated. Closed-loop control using ion currents on an HCCI engine was demonstrated. (Less)
Abstract (Swedish)
Popular Abstract in Swedish

Den nuvarande teknologin inom förbränningsmotorer har möjligheten att



hantera den alltmer strikta myndighetskraven på förbränningsmotorn. Emellertid de nödvändiga tekniska lösningarna som krävs är dyra och alltmer tekniskt krävande. En möjlig väg mot enklare efterbehandlingssystem är anvädningen av Homogen Kompressions Antändning (Eng: HCCI) motor cykeln. Den huvudsakliga fördelen med HCCI-motorn är dess låga utsläpp av NOx avgas emission. Den huvudsakliga nackdelen är att motorn kräver återkopplad reglering av förbränningsprocessen eftersom dess antändning är indirekt. Två metoder för att styra förbränningstimingen provades, två bränsle system och variabla ventiltider(Eng:... (More)
Popular Abstract in Swedish

Den nuvarande teknologin inom förbränningsmotorer har möjligheten att



hantera den alltmer strikta myndighetskraven på förbränningsmotorn. Emellertid de nödvändiga tekniska lösningarna som krävs är dyra och alltmer tekniskt krävande. En möjlig väg mot enklare efterbehandlingssystem är anvädningen av Homogen Kompressions Antändning (Eng: HCCI) motor cykeln. Den huvudsakliga fördelen med HCCI-motorn är dess låga utsläpp av NOx avgas emission. Den huvudsakliga nackdelen är att motorn kräver återkopplad reglering av förbränningsprocessen eftersom dess antändning är indirekt. Två metoder för att styra förbränningstimingen provades, två bränsle system och variabla ventiltider(Eng: VVA). Med två bränslen styrs förbränningstimingen genom att ändra antädningsegenskaperna på den homogena blandningen, med VVA påverkas förbränningsfasningen genom att det effektiva kompressionsförhållandes ändras.



Denna avhandling fokuserar på reglering av HCCI motorn. I syfte att studera reglering av HCCI motorn, ändamålsenlig mjukvara för reglering utvecklades. Denna mjukvara ämnade att åstadkomma återkopplad cykel till cykel reglering. Ytterligare hjälpmedel vid utvecklingen var användandet av Matlab/Simulink för design av kraftfulla styralgoritmer.



Framgångsrik systemidentifiering och reglerdesign har visats. Olika reglerstrategier utprovades, bland de mest framgångsrika av användandet av Modell Prediktiv Reglering (eng: MPC), vilket är en reglerstrategi som hanterar olinjärt beteende av dynamiska system och dess aktuatorer. Det visade sig att dynamiska modeller av låg ordning var tillräckligt för att fånga de viktiga dynamiska HCCI beteendet.



Användningen av jonström för detektion och reglering av HCCI visades. En metod för att bestämma förbränningstimingen genom jonström är definierad och undersökt. Återkopplad reglering av en HCCI motor med jonström visades. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • phd Ryan, Thomas, Southwest research institute
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Motorer, framdrivningssystem, Motors and propulsion systems, applied thermodynamics, Model Predictive Control, System Identification, HCCI, Closed Loop Combustion control, termodynamik, Termisk teknik, Thermal engineering, Ion Current
pages
189 pages
publisher
Department of Energy Sciences, Lund University
defense location
Room B, M-building, Ole Römers väg 1, Faculty of Engineering, Lund University
defense date
2006-05-29 10:15:00
external identifiers
  • other:ISRN:LUTMDN / TMHP - - 06 / 1039 - - SE
ISBN
978-91-628-6845-1
language
English
LU publication?
yes
additional info
id
5a8c25c0-fa9a-49ee-9855-3577a6ba4e0d (old id 546722)
date added to LUP
2016-04-01 16:23:11
date last changed
2018-11-21 20:41:01
@phdthesis{5a8c25c0-fa9a-49ee-9855-3577a6ba4e0d,
  abstract     = {The current technology within combustion engines have the possibility of handling the more stringent legislative demands on combustion engines. However the required solutions are getting more expensive and technically challenging. One possible way towards a more simple<br/><br>
<br/><br>
exhaust aftertreatment system is the use of the Homogeneous Charge Compression Ignition (HCCI) engine cycle. The main advantage of the HCCI engine is its low output of NOx exhaust emissions. Because of its indirect combustion initiation the main disadvantage is that it requires closed loop control of its combustion process. Two methods for engine timing control were used, dual fuels or variable valve actuation(VVA). With dual fuels the timing change was achieved by changing the autoignition properties of the homogeneous charge and with VVA, timing control was achieved by changing the effective compression ratio.<br/><br>
<br/><br>
This thesis focuses on the control of the HCCI engine. For the purpose of studying control of the HCCI engine, special engine control software was developed. This software aimed towards engine cycle-to-cycle control and actuation. Another aid in the development was the use of Matlab/Simulink for the design of powerful control algorithms.<br/><br>
<br/><br>
Successful system identification control design has been shown. Different control strategies were tested, amongst the most successful was the use of Model Predictive Control (MPC), which is a control strategy that can take care of the nonlinear behavior of the dynamic engine system and its actuators. It was concluded that low order models were sufficient for capturing the important HCCI engine dynamics.<br/><br>
<br/><br>
The use of ion current for detection and control of the HCCI combustion was also shown. A method for obtaining combustion timing from the ion current was defined and investigated. Closed-loop control using ion currents on an HCCI engine was demonstrated.},
  author       = {Strandh, Petter},
  isbn         = {978-91-628-6845-1},
  language     = {eng},
  publisher    = {Department of Energy Sciences, Lund University},
  school       = {Lund University},
  title        = {HCCI Operation - Closed loop combustion control using VVA or dual fuel},
  url          = {https://lup.lub.lu.se/search/ws/files/4657593/546729.pdf},
  year         = {2006},
}