Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Investigating Mode Switch from SI to HCCI using Early Intake Valve Closing and Negative Valve Overlap

Widd, Anders LU ; Borgqvist, Patrick LU ; Tunestål, Per LU ; Johansson, Rolf LU orcid and Johansson, Bengt LU (2011) 2011 JSAE/SAE International Powertrains, Fuel & Lubricants In SAE technical paper series
Abstract
This study investigates mode switching from spark ignited operation with early intake valve closing to residual gas enhanced HCCI using negative valve overlap on a port-fuel injected light-duty diesel engine. A mode switch is demonstrated at 3.5 bar IMEPnet and 1500 rpm. Valve timings and fuel amount have to be selected carefully prior to the mode switch. During mode transition, IMEPnet deviates by up to 0.5 bar from the set point. The time required to return to the set point as well as the transient behavior of the engine load varies depending on which control structure that is used. Both a model-based controller and a PI control approach were implemented and evaluated in experiments. The controllers were active in HCCI mode. The... (More)
This study investigates mode switching from spark ignited operation with early intake valve closing to residual gas enhanced HCCI using negative valve overlap on a port-fuel injected light-duty diesel engine. A mode switch is demonstrated at 3.5 bar IMEPnet and 1500 rpm. Valve timings and fuel amount have to be selected carefully prior to the mode switch. During mode transition, IMEPnet deviates by up to 0.5 bar from the set point. The time required to return to the set point as well as the transient behavior of the engine load varies depending on which control structure that is used. Both a model-based controller and a PI control approach were implemented and evaluated in experiments. The controllers were active in HCCI mode. The model-based controller achieved a smoother transition and while using it, the transition could be accomplished within three engine cycles. The initial deviation in load is unacceptable but can most likely be improved with a predictive mode transition model compared to empirically selected mode transition parameters. Changing the fuel injection method to direct injection instead of port injection is another possible improvement. (Less)
Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
SAE technical paper series
publisher
Society of Automotive Engineers
conference name
2011 JSAE/SAE International Powertrains, Fuel & Lubricants
conference location
Kyoto, Japan
conference dates
2011-08-30
external identifiers
  • scopus:85072501986
ISSN
0148-7191
project
Competence Centre for Combustion Processes
language
English
LU publication?
yes
additional info
key=wid+11c
id
674d73fe-f7bf-44c7-a0b2-24d2ef70393b (old id 2173309)
date added to LUP
2016-04-04 14:22:52
date last changed
2021-10-06 05:18:12
@article{674d73fe-f7bf-44c7-a0b2-24d2ef70393b,
  abstract     = {This study investigates mode switching from spark ignited operation with early intake valve closing to residual gas enhanced HCCI using negative valve overlap on a port-fuel injected light-duty diesel engine. A mode switch is demonstrated at 3.5 bar IMEPnet and 1500 rpm. Valve timings and fuel amount have to be selected carefully prior to the mode switch. During mode transition, IMEPnet deviates by up to 0.5 bar from the set point. The time required to return to the set point as well as the transient behavior of the engine load varies depending on which control structure that is used. Both a model-based controller and a PI control approach were implemented and evaluated in experiments. The controllers were active in HCCI mode. The model-based controller achieved a smoother transition and while using it, the transition could be accomplished within three engine cycles. The initial deviation in load is unacceptable but can most likely be improved with a predictive mode transition model compared to empirically selected mode transition parameters. Changing the fuel injection method to direct injection instead of port injection is another possible improvement.},
  author       = {Widd, Anders and Borgqvist, Patrick and Tunestål, Per and Johansson, Rolf and Johansson, Bengt},
  issn         = {0148-7191},
  language     = {eng},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE technical paper series},
  title        = {Investigating Mode Switch from SI to HCCI using Early Intake Valve Closing and Negative Valve Overlap},
  year         = {2011},
}