TIMED SAMPLING IN THE EXHAUST OF A DIRECT-INJECTION DIESEL ENGINE

Time-resolved sampling was used to measure hydrocarbon concentration profiles in the exhaust of a small, high-speed, direct-injection diesel engine in an effort to determine significant sources of hydrocarbon emissions. The engine was a single-cylinder design with a 0.53-L displacement and a swirl-supported, high-pressure-injection combustion system. In the past, most sampling work performed on diesel engines has been done in the cylinder and has focused on either oxides of nitrogen or soot emissions. The exhaust sampling done in this study provided a simple yet informative means of studying hydrocarbon emissions. Results from this study for wide ranges of engine speed and air-fuel ratio showed a single peak in the hydrocarbon concentration profile as a function of crank angle. Phasing of the hydrocarbon concentration peak generally coincided with the blowdown period of the exhaust event. Because the mass flow rate of the exhaust is high during blowdown, the contribution of unburned hydrocarbons exhausted during this period to total hydrocarbon mass emissions of the engine was significant; from 36 to 60 percent of the total HC mass emission, depending on air-fuel ratio. From these results it was concluded that, except at light load, fuel issuing from the sac volume of the injector late in the cycle was a significant source of unburned hydrocarbons in the exhaust.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Fuels and Lubricants Meeting, San Francisco, California October 31-November 3, 1983.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Myers, J P
• Publication Date: 1983

Media Info

• Features: Figures; References; Tables;
• Pagination: 11 p.
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Diesel engines; Exhaust gases; Fuel air mixtures; Fuel injection; Hydrocarbons; Sampling
• Uncontrolled Terms: Air fuel ratio
• Old TRIS Terms: Direct injection
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00389470
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 831710, HS-036 826
• Files: HSL, USDOT
• Created Date: Oct 30 1984 12:00AM