Experimental Investigation of a Control Method for SI-HCCI-SI Transition in a Multi-Cylinder Gasoline Engine

In HCCI engines, the Air/Fuel Ratio (AFR) and Residual Gas Fraction (RGF) are difficult to control during the SI-HCCI-SI transition, and this may result in incomplete combustion and/or high pressure raise rates. As a result, there may be undesirably high engine load fluctuations. The objectives of this work are to further understand this process and develop control methods to minimize these load fluctuations. This paper presents data on instantaneous AFR and RGF measurements, both taken by novel experimental techniques. The data provides an insight into the cyclic AFR and RGF fluctuations during the switch. These results suggest that the relatively slow change in the intake Manifold Air Pressure (MAP) and actuation time of the Variable Valve Timing (VVT) are the main causes of undesired AFR and RGF fluctuations, and hence an unacceptable Net IMEP (NIMEP) fluctuation. We also found large cylinder-to-cylinder AFR variations during the transition. Therefore, besides throttle opening control and VVT shifting, cyclic and individual cylinder fuel injection control is necessary to achieve a smooth transition. The control method was developed and implemented in a test engine, and the result was a considerably reduced NIMEP fluctuation during the mode switch. The instantaneous AFR and RGF measurements could furthermore be adopted to develop more sophisticated control methods for SI-HCCI-SI transitions.

• Record URL:
  • https://doi.org/10.4271/2010-01-1245
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/19463936
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • Wu, Hao
  • Collings, Nick
  • Regitz, Simon
  • Etheridge, Jonathan
  • Kraft, Markus
• Conference:
  • SAE 2010 World Congress & Exhibition
  • Location: Detroit Michigan, United States
  • Date: 2010-4-13 to 2010-4-15
• Publication Date: 2010-4-12

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 928-937
• Serial:
  • SAE International Journal of Engines
  • Volume: 3
  • Issue Number: 1
  • Publisher: SAE International
  • ISSN: 1946-3936
  • EISSN: 1946-3944
  • Serial URL: https://www.sae.org/publications/collections/content/E-JOURNAL-03/

Subject/Index Terms

• TRT Terms: Combustion; Compression ignition engines; Electronic control; Fuel air mixtures; Gasoline engines; Valve timing
• Subject Areas: Energy; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01681110
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2010-01-1245
• Files: TRIS, SAE
• Created Date: Sep 20 2018 4:34PM