Chassis Dynamometer Evaluation of On-Board Exhaust Emission Measurement System Performance in SI Car under Transient Operating Conditions

K Ropkins, J Tate, Hu Li, G Andrews, J Gary Hawley, M Bell

Research output: Contribution to conferencePaper

9 Citations (Scopus)

Abstract

A commercial on-board exhaust emissions measurement system, the Horiba OBS-1300, was evaluated in a series of chassis dynamometer test trails. A EURO 1 (petrol) SI passenger car, operated under normal and rich combustion conditions, and a combination of static and transient sampling provided a wide range of measurement conditions for the evaluation exercise. The chassis dynamometer facility incorporated an 'industry standard' measurement system comprising MEXA-7400 gas analyzer and CVS bag sampling system which were used as 'benchmarks' for the evaluation of both OBS-1300 component (exhaust flow meter and species analyzer) measurements and 'daughter' emission measurements for regulated gas-phase species (CO, CO2, HC and NOx). Trials demonstrated very good to reasonable agreement for exhaust flow and CO, CO2 and HC concentration measurements during static (R2 ≈ 0.97, 0.99, 0.99 and 0.97, respectively) and transient (R2 ≈ 0.88, 0.96, 0.95 and 0.86, respectively) testing. Transient emission measurements of CO, CO2 and HC were generally consistent with 'parent' exhaust and species analyzer measurements (R2 ≈ 0.89, 0.89 and 0.81, respectively). Minor issues associated with exhaust flow measurement error at engine 'tick-over'/idle and HC measurement agreement under different engine operating conditions are discussed. However, in general, the OBS-1300 provided a reliable measure of CO, CO2 and HC exhaust emissions under all conditions investigated. By contrast, the OBS NOx sensor cross-sensitivity to NH3 hindered the reliability of NOx data, especially under rich engine operation conditions.
Original languageEnglish
DOIs
Publication statusPublished - 2008
EventSAE International Powertrains, Fuels and Lubricants Congress - Shanghai, China
Duration: 23 Jun 200825 Jun 2008

Conference

ConferenceSAE International Powertrains, Fuels and Lubricants Congress
CountryChina
CityShanghai
Period23/06/0825/06/08

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    Ropkins, K., Tate, J., Li, H., Andrews, G., Hawley, J. G., & Bell, M. (2008). Chassis Dynamometer Evaluation of On-Board Exhaust Emission Measurement System Performance in SI Car under Transient Operating Conditions. Paper presented at SAE International Powertrains, Fuels and Lubricants Congress, Shanghai, China. https://doi.org/10.4271/2008-01-1826