车辆排放测量中的挑战与创新：低浓度NOx、替代燃料和混合动力的先进测量技术.pdf

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1、 2024 HORIBA,Ltd.All rights reserved.Joshua Israel,HORIBA Onboard Sensing,Analysis,and Reporting(OSAR)Conference 2024 Challenges and Innovations in Measurement for In-use Compliance:Advanced emission measurement techniques for low-concentration NOx,alternative fuels,and hybrid powertrains2024/03/14

2、2024 HORIBA,Ltd.All rights reserved.2Introduction 2024 HORIBA,Ltd.All rights reserved.3Introduction Part 1ChallengesPart 2Advances and Innovations 2024 HORIBA,Ltd.All rights reserved.4Direct measurement Turndown ratio Time Alignment Stability/high H2O content exhaust Measurement Challenges:Low-NOXDi

3、esel NOx measurement 120 ppm Mean value 10 ppm Source:Southwest Research,2024 1NOx 3.7 ppm(post SCR light-off)H2O 4.6%1Typical concentrations 2024 HORIBA,Ltd.All rights reserved.5“Slight variations”meaningfulDrift,Noise,Background,Response,Interference/quenchMeasurement Challenges:Low-NOXDiesel Stan

4、dard CLDHigh-sensitivity Analyzer10 ppm Range 2024 HORIBA,Ltd.All rights reserved.6Avg NOx 2 ppmAvg NOx 10 ppmBreakthrough 500 ppm Measurement Challenges:Alt Fuels,Carbonized NOx 9.7 ppm(0.2 g cert level)H2O 22.9%Avg ConcentrationsInterference gases:H2O,NH3,CO2,etc.NOx measurement 10 ppm 3CNG-fueled

5、 HD VehicleRenewable/Bio/Ethanol Fuels(E98+)TP emissions comparable to low-NOx diesel;Elevated levels of H2O Potential new species:NMHCe,HCHO 2024 HORIBA,Ltd.All rights reserved.7Measurement Challenges:Alt Fuels,Zero-carbonSource:SAE 2023 4 Elevated H2O content in exhaust(?)Source:SAE 2021 5 Potenti

6、al new measurement species:Hydrogen(?),H2O,NH3(fuel slip)Low-level concentrations of all criteria emissions 2024 HORIBA,Ltd.All rights reserved.8Summary of ChallengesThemes common to all technologies/fuels NOx measurement 10 ppm,Low-level concentrations of criteria emissions New species:Hydrogen,H2O