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

Författare:
Publiceringsår: 2011
Språk: Engelska
Dokumenttyp: Konferensbidrag
Ytterligare information: Key=wid+11c

Sammanfattning

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.

Disputation

Nyckelord

  • Technology and Engineering

Övriga

2011 JSAE/SAE International Powertrains, Fuel & Lubricants
2011-08-30
Kyoto, Japan
Published
Yes
  • LCCC

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