Past HEDGE Successes
HEDGE®-III Consortium
High-Efficiency Dilute Gasoline Engine


HEDGE-III logo website

Contact Information

Terrence F. Alger II, Ph.D.
Assistant Director
Engine and Vehicle R&D
Engine, Emissions, & Vehicle Research
(210) 522-5505
talger@swri.org

Applying HEDGE to a MD dual-fuel multi-mode combustion engine results in diesel-like BSFC while meeting US 2010 or Euro 6 emissions with no NOx aftertreatment.

Applying HEDGE to a MD dual-fuel multi-mode combustion engine results in diesel-like BSFC while meeting US 2010 or Euro 6 emissions with no NOx aftertreatment.


The HEDGE Dedicated EGR system applied to a 2.0L engine produces best in class BSFC with ultra-low emissions.

The HEDGE Dedicated EGR system applied to a 2.0L engine produces best in class BSFC with ultra-low emissions.

Southwest Research Institute (SwRI) has completed two previous consecutive consortium programs targeted to improve the efficiency of gasoline engines. These programs have resulted in intellectual property and technologies that have been integrated into today’s production engines. Below are brief accomplishments from these previous programs.

HEDGE-II (2009-2012)

  • Focused on high levels of exhaust gas recirculation (EGR) combined with supporting technologies to develop strategies for high efficiency
  • Extended the specific power levels of the engines for further improvement in vehicle efficiency
  • Suppressed low speed pre-ignition in turbocharged gasoline direct-injection engines

HEDGE-I (2005-2008)

  • Demonstrated that cooled EGR, when combined with an advanced ignition system for improved dilution tolerance, has the potential to significantly improve engine fuel efficiency by reducing knock and allowing for higher compression ratio operation
  • Demonstrated fuel consumption results in gasoline engines equal to or better than similar displacement diesel engines

Related Terminology

high-efficiency dilute gasoline engine  •  engine performance  •  engine durability  •  emission requirements  •  motor vehicles  •  EPA  •  emission standards  •  lower emission levels  •  diesel engine technology  •  gasoline engine technology  •  light-duty vehicles  •  heavy-duty engine manufacturers  •  knock-resistant combustion chambers  •  high-energy ignition  •  high brake mean effective pressure  •  BMEP  •  exhaust gas recirculation  •  EGR  •  component suppliers  •  oil and fuel companies

Benefiting government, industry and the public through innovative science and technology
Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.
02/11/13