重型发动机排放检测设备及标定方法_NN

1、2022-7-31重型重型发动机排放检测发动机排放检测及设备标定及设备标定方法方法 2022-7-32主要内容2022-7-33重型汽车用发动机排放法规2022-7-34检测的排气污染物项目 2022-7-35气态排放 6Sep, 2008AirFuelContinuity of Mass and Atoms2022-7-37 发动机排气中的颗粒2022-7-38减少排放的概念（柴油机）谢谢大家！2022-7-39排放试验条件 10Sep, 20087, 029899asTpFDiesel enginesNaturally aspirated5 , 17, 029899asTpFDiesel

2、enginesTurbo charged6, 02, 129899asTpFGas powered engines Turbo chargedAmbient ConditionsFactor “F” must be between 0.96 and 1.06ps = dry atm. pressure- humidity and altitude !Current Intake air requirement2022-7-311排放试验条件 2022-7-312排放试验条件2022-7-313排放试验条件 14Sep, 2008Cold /Hot and Wet/Dry Measurement

3、Cold:Ambient temperatureWet:Measurement with water in the exhaustBAG measurement on a CVS is “Wet” even with cold analyzers. No condensation takes place since dilution. Water interference check required for NDIR Analyzers.Dry:Measurement after removal of waterEven some “Hot” CLD analyzers measure dr

4、y.“Hot” up to the converter, to avoid that NO2 is solved in water, afterwards a dryer and a cold and “dry” detector. Hot:Heated analyzer 55Cto avoid condensation of water 113CHC measurement for alcohol fuels 190CHC measurement for diesel fuel 15Sep, 2008H2O50%50%100%333333100Dry measurement2022-7-31

5、6排放试验工况 2022-7-317稳态试验循环ESCF 发动机转速：FA = n50%power + 0.25(n70%power - n50%power)；FB = n50%power + 0.50(n70%power - n50%power)； FC =n50%power + 0.75(n70%power - n50%power)；2022-7-318排放限值(图解)2022-7-319排放试验工况 2022-7-320负荷响应试验循环ELR2022-7-321ETC排放试验工况 2022-7-322ETC排放试验工况 2022-7-323 瞬态试验循环ETC2022-7-324二、排放

6、试验和检测设备2022-7-325 二、排放试验设备2022-7-326 排放试验设备2022-7-327 排放试验设备2022-7-328排放试验设备2022-7-329 排放试验设备2022-7-330 排放试验设备2022-7-331气态污染物及颗粒物测试设备 32Sep, 2008OzonatorAir or O2 - O3NO2 - NO ConverterCLD Chemo Luminescence DetectorChemoluminescence CellLightDetectorRed Light2022-7-333气态污染物及颗粒物测试设备2022-7-334气态污染物及颗

7、粒物测试设备 35Sep, 2008AnalyzerHC SmallestRange10 ppm C1Analyzer minimumLimit (2% of PT)1 ppm +/- 20 ppb C1CH4 Cutter10 ppm C11 ppm +/- 20 ppb C1NOx 10 ppm1 ppm +/- 20 ppbCO Ultra low10 ppm1 ppm +/- 20 ppbOnly the Chinese Great-Wall can be seen from the moon, by human eyes. The wall is app. 7 meter wide+

8、/- 20 ppb is +/- 7 MeterAn accuracy of +/- 20 ppb (parts per billion) correlates to 7 meter for the distance between the earth and moon.Analyzer Accuracy2022-7-336气态污染物及颗粒物测试设备2022-7-337气态污染物及颗粒物测试设备4_60293. 1RATEFBAIRCONSCVSQ 38Sep, 2008Air Flow + Exhaust Flow = Diluted Flow = ConstantAirDilutedExh

9、austCVS: Constant Volume Sampler 39Sep, 2008Mass = Concentration * Volume * Density50 %5 l0,8 kg / l2.0 kgXX=Dilution does not change the emission mass25 %10 lX0,8 kg / lX2.0 kg=DilutedUn-DilutedHow do we get the Mass Emission2022-7-340气态污染物及颗粒物测试设备2022-7-341标定气管道及标定气2022-7-342发动机标准进气(空调)系统2022-7-343发动机进气空调系统2022-7-344其它设备 n进气、排