Measurement of Automobile Exhaust N2O in Continuous Dilute and in Sample Storage Bag by a Mid-IR Laser Spectroscopic Motor Exhaust Gas Analyzer Horiba, Limited

Format:

Conference/Event

Author/Creator:

Rahman, Rahman, author.

Contributor:

Hara, Kenji

Nakatani, Shigeru

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Nitrous oxide (N₂O) emission reduction has gained largeprominence recently due to its contribution to the climate changeas a greenhouse gas. The United States Environment ProtectionAgency (US-EPA) together with the United States Department ofTransport (DOT) has already regulated the N₂O emissions fromlight-duty vehicles (LDV) to 0.010 g/mile. For LDV, N₂O measurementshould be done from sample storage bags over the light-duty FTPdrive cycles. N₂O emission standard of 0.10 g/bhp-hr for heavy-dutyengines (HDE) is also finalized. The final N₂O standard becomeseffective in 2014 model year for diesel engines. Usually raw ordiluted exhaust is measured for HDE emission testing. Therefore, ananalyzer capable of measuring N₂O from bag and from diluted samplecontinuously is required to support both LDV and HDEregulations.Nondispersive infrared (NDIR) analyzer, Fourier transforminfrared (FTIR) analyzer, Laser infrared analyzer, Photoacousticanalyzer (PAS), and Gas chromatograph (GC) analyzer have beenrecommended for N₂O measurement. In the previous study, the authorshad developed an instrument based on mid-infrared laserspectroscopy for measuring ultra-low level N₂O in automobileexhaust gas sampled in a sample storage bag. In this study,comparative measurement of automobile exhaust N₂O in continuousdilute and in sample storage bag has been attempted. A modernvehicle meeting 2008 Japanese emission standards has beenevaluated. Tests are conducted on a chassis dynamometer cell underdifferent test cycles. In addition, verification of theinterference of co-existing gases commonly observed in automobileexhaust gas has also been performed.In this study, it is found that the laser-based exhaust gasanalyzer has sufficient detection capability for bag measurementand fast response for continuous dilute measurement. There is nointerference caused by CO, CO₂, and H₂O usually observed in theautomobile exhaust gas in significantly amount and have absorptionin the same wavelength region as of N₂O used in this analyzer. Thetest vehicle emits very low N₂O and most of them are emitted withinfirst 100 seconds of the FTP driving cycle when tested under coldstart condition

Notes:

Vendor supplied data

Publisher Number:

2012-01-0875

Access Restriction:

Restricted for use by site license