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Title: Engine combustion control via fuel reactivity stratification

A compression ignition engine uses two or more fuel charges having two or more reactivities to control the timing and duration of combustion. In a preferred implementation, a lower-reactivity fuel charge is injected or otherwise introduced into the combustion chamber, preferably sufficiently early that it becomes at least substantially homogeneously dispersed within the chamber before a subsequent injection is made. One or more subsequent injections of higher-reactivity fuel charges are then made, and these preferably distribute the higher-reactivity matter within the lower-reactivity chamber space such that combustion begins in the higher-reactivity regions, and with the lower-reactivity regions following thereafter. By appropriately choosing the reactivities of the charges, their relative amounts, and their timing, combustion can be tailored to achieve optimal power output (and thus fuel efficiency), at controlled temperatures (and thus controlled NOx), and with controlled equivalence ratios (and thus controlled soot).
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Issue Date:
OSTI Identifier:
Wisconsin Alumni Research Foundation (Madison, WI) NETL
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2013 Dec 17
Research Org:
Wisconsin Alumni Research Foundation, Madison, WI (United States)
Sponsoring Org:
Country of Publication:
United States

Other works cited in this record:

In-Cylinder Fuel Blending of Gasoline/Diesel for Improved Efficiency and Lowest Possible Emissions on a Multi-Cylinder Light-Duty Diesel Engine
conference, October 2010

An Experimental Investigation of Fuel Reactivity Controlled PCCI Combustion in a Heavy-Duty Engine
journal, April 2010
  • Hanson, Reed M.; Kokjohn, Sage L.; Splitter, Derek A.
  • SAE International Journal of Engines, Vol. 3, Issue 1, p. 700-716
  • DOI: 10.4271/2010-01-0864

Fuel Effects on Reactivity Controlled Compression Ignition (RCCI) Combustion at Low Load
journal, April 2011
  • Hanson, Reed; Kokjohn, Sage; Splitter, Derek
  • SAE International Journal of Engines, Vol. 4, Issue 1, p. 394-411
  • DOI: 10.4271/2011-01-0361

Dual-Fuel PCI Combustion Controlled by In-Cylinder Stratification of Ignitability
conference, April 2006

Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending
journal, October 2009
  • Kokjohn, Sage L.; Hanson, Reed M.; Splitter, Derek A.
  • SAE International Journal of Engines, Vol. 2, Issue 2, p. 24-39
  • DOI: 10.4271/2009-01-2647

Fuel Reactivity Controlled Compression Ignition (RCCI) Combustion in Light- and Heavy-Duty Engines
journal, April 2011
  • Kokjohn, Sage; Hanson, Reed; Splitter, Derek
  • SAE International Journal of Engines, Vol. 4, Issue 1, p. 360-374
  • DOI: 10.4271/2011-01-0357

Use of Detailed Kinetics and Advanced Chemistry-Solution Techniques in CFD to Investigate Dual-Fuel Engine Concepts
journal, April 2011
  • Puduppakkam, Karthik V.; Liang, Long; Naik, Chitralkumar V.
  • SAE International Journal of Engines, Vol. 4, Issue 1, p. 1127-1149
  • DOI: 10.4271/2011-01-0895

An Optical Investigation of Ignition Processes in Fuel Reactivity Controlled PCCI Combustion
journal, April 2010
  • Splitter, Derek; Kokjohn, Sage; Rein, Keith
  • SAE International Journal of Engines, Vol. 3, Issue 1, p. 142-162
  • DOI: 10.4271/2010-01-0345

High Efficiency, Low Emissions RCCI Combustion by Use of a Fuel Additive
journal, August 2010
  • Splitter, Derek; Reitz, Rolf D.; Hanson, Reed
  • SAE International Journal of Fuels and Lubricants, Vol. 3, Issue 2, p. 742-756
  • DOI: 10.4271/2010-01-2167

Reactivity Controlled Compression Ignition (RCCI) Heavy-Duty Engine Operation at Mid-and High-Loads with Conventional and Alternative Fuels
conference, April 2011

Modeling Diesel Engine NOx and Soot Reduction with Optimized Two-Stage Combustion
conference, April 2006

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