A double closed-loop control (DCL) controls simultaneously the charge composition for minimum brake specific fuel consumption (BSFC) and the co-related ignition timing over the speed load range considering all varying parameters like octane requirement increase (ORI), all interesting temperatures, such as exhaust valve, piston deck, engine oil and water etc., fuel variables such as CHO ratio, RON, MON, density and viscosity, ambient conditions such as humidity and altitude, general engine conditions such as spark plug erosion etc., utilizing basically only one extra sensor and control means. Still the same means serve as preknock detecting and control. The arrival of the flame front in the end gas area controls cycle by cycle the best ignition timing. The jitter amplitude in flame front arrivals at the same flame front sensor (FFS) controls the A/F and/or EGR ratio.

Media Info

  • Features: Figures;
  • Pagination: p. 69-98

Subject/Index Terms

Filing Info

  • Accession Number: 00393091
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: Proceeding, HS-037 234, HS-037 235
  • Files: HSL, USDOT
  • Created Date: Mar 29 1985 12:00AM