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首页> 外文会议>Emissions measurement and testing, 2009 >Enabling Flex Fuel Vehicle Emissions Testing - Test Cell Modifications and Data Improvements
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Enabling Flex Fuel Vehicle Emissions Testing - Test Cell Modifications and Data Improvements

机译：启用Flex燃料汽车排放测试-测试单元修改和数据改进

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摘要

The challenges of flex-fuel vehicle (FFV) emissions measurements have recently come to the forefront for the emissions testing community. The proliferation of ethanol blended gasoline in fractions as high as 85% has placed a new challenge in the path of accurate measures of NMHC and NMOG emissions. Test methods need modification to cope with excess amounts of water in the exhaust, assure transfer and capture of oxygenated compounds to integrated measurement systems (impinger and cartridge measurements) and provide modal emission rates of oxygenated species. Current test methods fall short of addressing these challenges. This presentation will discuss the challenges to FFV testing, modifications made to Ford Motor Company's Vehicle Emissions Research Laboratory test cells, and demonstrate the improvements in recovery of oxygenated species from the vehicle exhaust system for both regulatory measurements and development measurements. A series of recovery experiments were conducted using controlled injections of known masses of ethanol into vehicle exhaust systems. Results show that heating exhaust sample lines and pre-dilution transfer tubes enable increases in recovery and the use of FTIRs with appropriately designed sampling systems. Modal measurements of cold-start emissions show dramatic improvements with heated systems and provide much needed insight to product development engineers/calibrators. Finally, modifications to impinger/cartridge sampling have improved recovery from ～50% to near 100% while requiring little change to operator standard procedures.
机译：灵活燃料汽车（FFV）排放测量的挑战最近已成为排放测试界的最前沿问题。乙醇混合汽油的分数高达85％的扩散，在精确测量NMHC和NMOG排放的道路上提出了新的挑战。测试方法需要修改以应对排气中过量的水，确保将含氧化合物转移和捕获到集成的测量系统（撞击器和药筒测量），并提供含氧物质的模式排放率。当前的测试方法未能解决这些挑战。本演讲将讨论FFV测试面临的挑战，对福特汽车公司的车辆排放研究实验室测试室进行的修改，并论证从车辆排气系统回收含氧物质以进行监管测量和开发测量的改进。使用已知质量的乙醇受控注入汽车排气系统中进行了一系列的回收实验。结果表明，加热废气采样管线和预稀释传输管可以提高回收率，并在设计适当的采样系统后使用FTIR。冷启动排放的模态测量显示出加热系统的显着改善，并为产品开发工程师/校准人员提供了急需的洞察力。最后，对撞击器/弹药筒采样的改进使回收率从约50％提高到接近100％，而对操作员标准程序的更改却很少。

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