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On-Vehicle Emissions Testing System. Final rept.
| 题名： | On-Vehicle Emissions Testing System. Final rept. |
| 关键词： | *Emission-tests; *Vehicle-air-pollution.;Performance-tests; Exhaust-emissions; Design-; Fabrication-. |
| 摘要： | Work done under this contract focused on two key improvements needed for the Simple Portable On-Vehicle Testing (SPOT) system. First, the probe geometry was to be significantly smaller such that it could be used with exhaust pipes smaller than 3 inches (7.62 cm). Secondly, enhancements were sought that may improve accuracy and signal to noise ratios. Several design iterations were investigated and two primary designs were built and tested. An optimized design based on a machined venture with a 12-inch (1.27 cm) aspiration tube was built and tested. This led to the construction of several 2 inch exhaust probes for the SPOT program. The new design offers several advantages including ease of use with exhaust pipe diameters from 2 to 8 inches, compatibility with complex exhaust pipe geometries (such as teardrop exits, pipes with rain caps etc.), accuracy and precision comparable with the best laboratory grade engine test cell mass air flow measurement systems. The results of this work culminated with the assembly of a new 2-inch probe that was supplied under another contract to CARB with a SPOT unit. |
| 报告类型： | 科技报告 |
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