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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 and Johansson, Bengt LU (2011) 2011 JSAE/SAE International Powertrains, Fuel & Lubricants
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)
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2011 JSAE/SAE International Powertrains, Fuel & Lubricants
external identifiers
  • Scopus:84881194151
language
English
LU publication?
yes
id
674d73fe-f7bf-44c7-a0b2-24d2ef70393b (old id 2173309)
date added to LUP
2011-10-11 14:27:42
date last changed
2016-10-13 05:01:44
@misc{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},
  language     = {eng},
  title        = {Investigating Mode Switch from SI to HCCI using Early Intake Valve Closing and Negative Valve Overlap},
  year         = {2011},
}