Variability of heavy-duty diesel engine emissions for transient and 13-mode steady-state test methods
The variability of heavy-duty diesel engine emissions was determined during a cooperative test program by the Engine Manufacturers Association and the Environmental Protection Agency. Six heavy-duty diesel engines with rated power ranging from 150 kW to 280 kW were evaluated to determine the nitrogen oxide, hydrocarbon and particulate emissions variabilities within and among laboratories. Tests were performed using the recently adopted heavy-duty diesel engine transient cycle and the 13-mode steady-state method which was used for certification until the 1984 model year. Transient and 13-mode test variabilities were nearly the same for nitrogen oxides and particulates, however hydrocarbon variabilities were greater for transient than for 13-mode tests. The variances among different laboratories were greater than within individual laboratories by a factor of about two, except when several months of testing elapsed, in which case the variability within a laboratory was nearly the same as among-laboratories. Comparisons of variances and regulations indicated that nitrogen oxide and hydrocarbons variabilities were about 25% of the regulated emission values. The corresponding particulate variability was 76% of the proposed regulation which suggests that particulate control presents a significant challenge.
- OSTI ID:
- 5687432
- Report Number(s):
- TP-840346
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
29 ENERGY PLANNING
POLICY AND ECONOMY
DIESEL ENGINES
AIR POLLUTION MONITORING
HYDROCARBONS
NITROGEN OXIDES
PARTICULATES
BENCH-SCALE EXPERIMENTS
EXHAUST GASES
INTERLABORATORY COMPARISONS
POLLUTION REGULATIONS
POWER RANGE 100-1000 KW
STEADY-STATE CONDITIONS
TRANSIENTS
US EPA
VARIATIONS
CHALCOGENIDES
ENGINES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NATIONAL ORGANIZATIONS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
REGULATIONS
US ORGANIZATIONS
WASTES
330102* - Internal Combustion Engines- Diesel
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
293000 - Energy Planning & Policy- Policy
Legislation
& Regulation
500600 - Environment
Atmospheric- Regulations- (-1989)