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Emissions from Current Diesel Vehicles
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Abstract
Regulated and non-regulated emissions from five current European diesel passenger cars and one light-duty diesel truck were measured to assess the environmental impact of diesel vehicles and to help determine the emission characteristics of the two types of combustion systems: indirect injection (IDI) and high speed direct injection (HSDI). The vehicle emissions were measured using the European Motor Vehicle Emissions Group (MVEG) cycle and the U.S. Federal (FTP 75) test procedures. Measured emissions included HC, CO, NOx and particulate mass (PM), C1 to C12 hydrocarbon species (here called light hydrocarbon or LHC), aldehydes, particulate composition and particle size distribution. The particulate composition measurements included soluble organic fraction (SOF), its oil and fuel sub-fractions, and the sulfate fraction. All passenger cars and the light-duty commercial vehicle tested complied with the current European Emissions Directive 91/441/EEC. Two passenger cars achieved the EEC Stage 2 levels, and one nearly met the 1994 Tier I U.S. Federal standards. The LHC accounted for between 35 to 78% of the total HC measured by the heated FID analyzer. Fuel and oil comprised between 12 and 30% of the PM emissions. The non-methane organic gases (NMOG) emissions and the LHC ozone reactivity from diesel cars were both about 50% less than those from gasoline cars. Of the non-regulated emissions, formaldehyde was generally below 0.009 g/km, and benzene emissions were below 0.0035 mg/km. The results were compared with European gasoline vehicles and the Current Gasoline Vehicle fleet of the U.S. Air Quality Improvement Program (AQIRP), and an assessment was made of the relative environmental impacts of gasoline and diesel vehicles.
Over the last 20 years, there has been a substantial effort to lower the exhaust emissions from both diesel and gasoline passenger vehicles. Over the same period, the percentage of diesel passenger vehicles purchased in Europe has been increasing steadily(1)*. Lower operating(2) and maintenance costs, and better durability with equivalent drive performance appear mainly responsible for the increased diesel sales. However, even though both diesel and gasoline vehicles meet the current emission standards, questions have arisen about their relative impact on the environment(3). In addition, with future requirements for lower emissions, these questions will undoubtedly continue.
The relative environmental impact of diesel and gasoline vehicles is still uncertain because there are relatively few published data on the emissions of current diesel vehicles and because the environmental impacts of the expected emissions are not clearly understood. Data on the regulated emissions for diesel passenger vehicles sold in Europe are available from the German Government:(4) starting in 1991. There are also published reports on regulated emissions from late 1980 and early 1990 diesel cars in the literature(5,6,7). Still there are few reports on the non-regulated emissions from current diesel vehicles(8,9,10).
On the other hand, there are substantial published data on the regulated emissions of current gasoline vehicles(11). In addition, there are substantial data on the non-regulated emissions of gasoline cars, especially from the U.S. Air Quality Improvement Research Program (AQIRP)(12). The AQIRP emissions data included measurements of over 150 individual hydrocarbon and aldehydic compounds which allow estimates of the amount of urban ozone formed from the exhaust and of the atmospheric toxic compound levels. Diesel vehicles were not included in AQIRP.
This paper reports on detail regulated and non-regulated emissions measurements for six 1992/93 model year diesel vehicles, including two Ford and four competitor vehicles. The emissions were measured on both the 1993 European MVEG cycle and the U. S. Federal test procedure. The U. S. AQIRP analytical methods were used for hydrocarbon and aldehydic speciation. The report discusses the regulated emissions from the six diesel vehicles compared to emissions standards, their contribution to urban ozone formation, toxic levels and global warming. It also compares the exhaust emissions of current diesel and gasoline vehicles to help clarify their relative environmental impact.
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Hammerle, R., Ketcher, D., Horrocks, R., Lepperhoff, G. et al., "Emissions from Current Diesel Vehicles," SAE Technical Paper 942043, 1994, https://doi.org/10.4271/942043.Also In
References
- Society of Motor Manufacturers and Traders
- International Energy Agency “Energy Prices and Taxes,” International Energy Agency, Organization for Economic Co-operation and Development Paris, France 1992
- Quality of Urban Air Review Group “Diesel Vehicle Emissions and Urban Air Quality,” Second Report prepared for the U. K. Department of the Environment University of Birmingham, Institute of Public and Environmental Health Birmingham, U. K, 1993
- Flensburg, Deutschland May 1991 1992 1993
- Lawrence P. J, Evans R. W. “The Ford 1.8L Four Cylinder Turbocharged Diesel Engine for Passenger Car Applications,” Society of Automotive Engineers Paper No. 901716 1990
- Berg W. Holmes J. G. “Oxidation Catalysts for Automotive Diesels-Emissions Performance and European Experience,” Air and Waste Management Association 1991
- Holms J. G. Berg W. “Advanced Diesel Systems as Clean Fuel Vehicles,” Air and Waste Management Association Paper No. 90.149.8 1990
- International Agency for Research on Cancer Monograph on the Evaluation of Carcinogenic Risks to Humans Diesel and Gasoline Engine Exhaust and Some Nitroarenes IARC Lyon, France 46 1989
- Smith L. R. “Characterization of Exhaust Emissions from Trap-Equipped Light-Duty Diesels,” Final Report No. SWRI-1280, or ARB-R-89/387 California Air Resources Board Sacramento 1989
- Volkswagen AG Research and Development “Unregulated Motor Vehicle Exhaust Gas Components,” Volkswagen, Wolfsburg, Germany March 1989
- U. S. Environmental Protection Agency “Control of Air Pollution from New Motor Vehicles and New Motor Engines - Federal Certification Test Results for the 199x Model Year U. S. EPA Publications
- Auto/Oil Air Quality Improvement Research Program Society of Automotive Engineers Report No. SP-920 1991
- Lepperhoff G. Hüthwohl G. Lüers-Jongen B. Hammerle R. H. “Analytical Methods for Non-Regulated Emissions from Diesel Vehicles,” Society of Automotive Engineers Paper No. 941952 1994
- Hammerle R. H. Korniski T. J. Weir J. E. Chladek E. Gierczak C. A. Chase R. E. Hurley R. G. “Effect of Mileage Accumulation on Particulate Emissions from Vehicles Using Gasoline with Methylcyclopentadienyl Manganese Tricarbonyl,” Society of Automotive Engineers Paper No. 920731 1992
- Menne R. J. Rechs M. Horrocks R. Harbolla B. “Current and Future Trends of Passenger Car Diesel Engines,” Motortechnische Zietschrift 55 322 330 1994
- Schuetzle D. Jensen T. E. Nagy D. Prostak A. Hochhauser A. “Analytical Chemistry and Auto Emissions,” Analytical Chemistry 63 1991
- Carter W. P. L. “Development of Ozone Reactivity Scales for Volatile Organic Compounds,” Available from the Public Information Office of the Air Resources Board
- Baumgard K. J. Jonson J. H. “The Effect of Low Sulfur Fuel and Ceramic Particle Filter on Diesel Exhaust Particle Size Distribution,” Society of Automotive Engineers Paper No. 920566 1992
- Mauderly J. L. “Current Assessment of the Carcinogenic Hazard of Diesel Exhaust,” Toxicological and Environmental Chemistry Reviews 1994
- Dockery D. W. Pope C. A. Xu X. Spengler J. D. Ware J. H. Fay M. E. Ferris B. G. Speizer F. E. “An Association between Air Pollution and Mortality in Six U.S. Cities,” The New England Journal of Medicine 329 1753 1808 1993
- Dockery D. W. Pope C. A. “Acute Respiratory Effects of Particulate Air Pollution,” Annual Reviews Public Health 15 107 132 1994
- Rao V. D. N. Cikanek H. A. Horrocks R. W. “Diesel Particulate Control System for Ford 1.8L Sierra Turbo Diesel to Meet 1997/2003 Particulate Standards,” Society of Automotive Engineers Paper No. 940458 1994