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Abstract

The accurate measurement of transient engine-out exhaust compositions, flow rate and temperature is critical for analysing and understanding the performance of exhaust system after-treatment components. This paper describes procedures for processing the transient emission data measured at vehicle test sites. These procedures include estimation of the hydrogen, oxygen and water concentrations and correction of the engine-out exhaust gas flow for the first few seconds of the drive cycle for non-oxygenated and oxygenated fuels. Both secondary air injection and non-secondary air injection applications are discussed. A procedure for accurately measuring the exhaust gas temperature during transient operations is also described with a specific thermocouple recommended for best results. A checklist for handling and processing the measured data is also provided. In addition to providing better data for further analysis and understanding of exhaust after-treatment components, the procedures listed in this work allow consistent and reliable input data to be generated for the mathematical model and model-based application studies using the measured vehicle emission data.

Keywords

Automobile emissions data analysis air-to-fuel ratio secondary air injection exhaust concentrations after-treatment modelling

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References

Kandylas

Stamatelos

Dimitriadis

. Statistical uncertainty in automotive emissions testing. Proc IMechE Part D: J Automobile Engineering 1999; 213(5): 491–502.

Weilenmann

Bach

Rudy

. Aspects of instantaneous emission measurement. Int J Veh Des 2001; 27: 94–104.

Weilenmann

Soltic

Ajtay

. Describing and compensating gas transport dynamics for accurate instantaneous emission measurement. Atmos Environ 2003; 37(37): 5137–5145.

Kamarianakis

Gao

. Accounting for exhaust gas transport dynamics in instantaneous emission models via smooth transition regression. Environ Sci Technol 2010; 44(4): 1320–1326.

Hawley

Brace

Cox

Ketcher

Stark

. Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer. SAE paper 2003-01-0395, 2003.

Krishnamurthy

Gautam

. Quality assurance of exhaust emissions test data measured using portable emissions measurement system. SAE paper 2005-01-3799, 2005.

Konstantas

Stamatelos

. Quality assurance of exhaust emissions test data. Proc IMechE Part D: J Automobile Engineering 2004; 218(8): 901–914.

Rothenberg

. Data mining in catalysis: separating knowledge from garbage. Catal Today 2008; 137(1):2–10.

Douglas

. AFR and emissions calculations for two-stroke cycle engines. SAE paper 901599, 1990.

10.

Turns

. An introduction to combustion: concepts and applications. New York: McGraw-Hill, 2000.

11.

Katare

Laing

. Hydrogen in diesel exhaust: effect on diesel oxidation catalyst flow reactor experiments and model predictions. SAE paper 2009-01-1268, 2009.

12.

AFR sensor. http://en.wikipedia.org/wiki/AFR_sensor (2011).

13.

Oxygen sensor. http://en.wikipedia.org/wiki/Oxygen_sensor (2011).

14.

Morey

Seers

. Comparison of cycle-by-cycle variation of measured exhaust-gas temperature and in-cylinder pressure measurements. Appl Thermal Engng 2010; 30(5): 487–491.

15.

Sorin

Bouloc

Bourouga

Anthoine

. Experimental study of periodic heat transfer coefficient in the entrance zone of an exhaust pipe. Int J Thermal Sci 2008; 47(12): 1665–1675.

16.

Gong

Huang

Deng

Liu

. Catalyst light-off behavior of a spark-ignition LPG (liquefied petroleum gas) engine during cold start. Energy 2011: 36(1):53–59.

17.

Kandylas

Stamatelos

. Engine exhaust system design based on heat transfer computation. Energy Conversion Managmt 1999; 40(10): 1057–1072.

18.

Guojiang

Song

. CFD simulation of the effect of upstream flow distribution on the light-off performance of a catalytic converter. Energy Conversion Managmt 2005; 46(13–14): 2010–2031.

19.

Shuai

S-J

Wang

J-X

. Unsteady temperature fields of monoliths in catalytic converters. Chem Engng J 2004; 100(1–3): 95–107.

20.

Kumar

Mazumder

. Toward simulation of full-scale monolithic catalytic converters with complex heterogeneous chemistry. Comput Chem Engng 2010; 34(2): 135–145.

Post-processing of vehicle emission test data for use in exhaust after-treatment modelling and analysis

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