Emission Testing of N2O (Bag Sampling) from Diverse Vehicles by Laser Spectroscopic Motor Exhaust Gas Analyzer Horiba, Limited

Format:

Conference/Event

Author/Creator:

Rahman, Rahman, author.

Contributor:

Hara, Kenji

Nakatani, Shigeru

Tanaka, Yoshimasa

Conference Name:

SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

The United States Environmental Protection Agency (EPA) hasfinalized a reporting rule for the Greenhouse Gases (GHGs)emissions including Nitrous Oxide (N₂O) from all sectors of theeconomy. In addition, EPA and the National Highway Traffic SafetyAdministration (NHTSA) have been working together on developing aNational Program of harmonized regulations to reduce GHGs emissionsand improve fuel economy of light-duty vehicles (LDV). As aconsequence, the limiting value for N₂O emission from LDV is set to0.01 g/mile. Considering this regulatory limit of N₂O emission fromLDV, if the exhaust gas is diluted and stored in a sample storagebag, the concentration of N₂O becomes very low which requires ahighly sensitive analyzer for accurate measurement.In the previous study, an instrument based on Quantum CascadeMid-IR Laser (QCL-Mid IR) Spectroscopy has been developed formeasuring ultra-low level of N₂O in automobile exhaust gas sampledin a sample storage bag. In this study, the instrument has beenused for measuring total and modal mass emissions of N₂O from fourdifferent LDVs, all meeting regional emission standards applicablefor respective model years. The vehicles included a directinjection (DI) gasoline vehicle, a direct injection diesel vehicle,and two conventional port injection (PI) gasoline vehicles. Themain objective is to examine the measurement capability of theinstrument and to develop a better understanding of N₂O emissionsfrom diverse catalyst-equipped vehicles. Measurements are conductedon a chassis dynamometer under FTP75 driving cycle both at cold andhot start conditions. Samples are stored in sample storage bags formeasurement after being diluted in a Constant Volume Sampling (CVS)system.It is found from the investigation that the DI gasoline vehicleemits higher N₂O (approximately double) than conventional PIgasoline vehicles. N₂O emission is found to be increased duringnitrogen oxides (NOx) conversion in the catalyticconverter. The concentration of N₂O in the sample storage bagbecomes very low upon dilution. The laser-based motor exhaust gasanalyzer showed strong potential for measuring this ultra-lowconcentration of N₂O in sample storage bag

Notes:

Vendor supplied data

Publisher Number:

2011-01-1155

Access Restriction:

Restricted for use by site license