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“Measurement of Rimning Loss Emissions from In-Use Vehicles”
| 题名： | “Measurement of Rimning Loss Emissions from In-Use Vehicles” |
| 作者： | Dermis McClement, Jack A. Dueck, and Brian Hall |
| 关键词： | Hydrocarbons SHED VT-SHED Diurnal Emissions Evaporative Emissions Hot Soak Emissions Caibureted Vehicles NOx Running Losses I/M 240 |
| 摘要： | A total of 150 vehicles were tested in Mesa, Arizona during the summer months of 1997. Running loss hydrocarbon emissions were measured using a dynamometer enclosed in an evaporative emissions enclosure (SHED). The vehicles were operated on a single UDDS cycle during the test. The as-received fuel remained in the vehicles. New vehicle evaporative emission certification test equipment specifications, test procedures, and quality control limits were used, with specified exceptions required to test publicly owned in-use vehicles. Prior to the running loss test, each vehicle’s exhaust system was carefully checked for leaks and repaired as necessary. Thermocouples were installed on the outside of each fuel tank and provisions were made to duct air from the outside of the SHED enclosure to the operating engine during this vehicle preparation. A thorough inspection of vehicle components related to evaporative emissions was performed on each vehicle following the initial test with the vehicles in the “as-received” condition. Thirty vehicles were selected for repairs and were retested following repairs; 10 vehicles were selected for as-received replicate testing. |
| 报告类型： | 科技报告 |
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