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Gearing diesel engines up for an even cleaner future

Cooperative research program to meet proposed diesel engine emissions standards for the year 2004

San Antonio — January 29, 1996 — A successful international cooperative industry research program, known as the Clean Heavy-Duty Diesel Engine (CHDDE I) project, started by Southwest Research Institute® (SwRI®) in 1991 to develop a low-emission diesel engine to meet proposed U.S. emissions and efficiency standards for the year 2000, has been extended for an additional four years.

“In the second phase of the program, we will try to meet standards that go beyond industry targets proposed for the year 2004,” said Daniel W. Stewart, manager of Engine Development and Controls in the SwRI Engine and Vehicle Research Division. “CHDDE II goals call for the reduction of exhaust emissions for nitrogen oxide (NOx) to levels of less than 1.0 gm/hp-hr and for particulates (PM) to less than 0.035 gm/hp-hr.

“There will be some changes in the focus of our research,” he added. Key technologies to be addressed in CHDDE II include the effects on fuel injectors of higher pressure, smaller nozzle holes, injection and rate controls; exhaust aftertreatment using passive particulate traps; evaluations of fuel reformulation as well as the use of water/fuel emulsions controlled in real-time; and the effects of exhaust gas recirculation (EGR) in diesels, a technology that is already well established in gasoline engines. A homogeneous charged compression ignition combustion system operating on diesel fuel will also be investigated and engine efficiency levels will be maintained at industry- proposed 1998 levels.

“We will also try to develop design alternatives and strategies to optimize the effective use of new design technologies derived from the program into various product lines suggested by participants,” Stewart said. Engine firms participating in the program to date include Cummins Engine Company, Columbus, Indiana; DAF Trucks N.V., Eindhoven, Netherlands; Iveco, Arbon, Switzerland; Hino Motors Ltd., Tokyo, Japan; Mack Trucks Inc., Hagerstown, Maryland; Volvo Truck Corporation, Goteborg, Sweden; John Deere, Waterloo, Iowa; and Detroit Diesel, Detroit, Michigan. Component suppliers include Garret Automotive, Torrance, California; Zexel Corporation, Saitama, Japan; and Lucas Electronics, Gillingham, United Kingdom.

Membership in the program remains open and costs $95,000 a year for engine manufacturers and $55,000 for component suppliers. Participating firms may join at any time, although there are some financial penalties for joining at a later stage. Meetings are held three times a year, and research priorities are made available on request.

For more information about CHDDE II, contact Deborah Deffenbaugh, Communications Department, Southwest Research Institute, P.O. Drawer 28510, San Antonio, Texas 78228-0510, Phone (210) 522-2046, Fax (210) 522-3547.

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