Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer

J G Hawley, A Cox, C J Brace, D Ketcher, R Stark

Research output: Contribution to conferencePaper

8 Citations (Scopus)

Abstract

Time-alignment sensitivity studies have been carried out to assess the accuracy of instantaneous mass NOx emissions on a chassis rolls dynamometer. The work is part of a larger project aimed at measuring passive NOx catalyst conversion efficiencies. Instantaneous NOx emissions are examined in relation to the NEDC vehicle speed trace at multi-sampling points, and phase and time alignment issues are highlighted and discussed. It has been found that a small mismatch of the vehicle speed trace to the instantaneous mass of emissions of \mP2 seconds can lead to results indicating that the conversion efficiency is anywhere between 0-20%. Finally, examples are presented showing the difficulties of attempting to adjust the time alignment of raw emissions data.
Original languageEnglish
Publication statusPublished - Mar 2003
EventSAE World Congress & Exhibition - Detroit, MI, USA United States
Duration: 1 Apr 2008 → …

Conference

ConferenceSAE World Congress & Exhibition
CountryUSA United States
CityDetroit, MI
Period1/04/08 → …

Fingerprint

catalyst
sampling
alignment
calculation
vehicle
speed
project
measuring
emission data

Cite this

Hawley, J. G., Cox, A., Brace, C. J., Ketcher, D., & Stark, R. (2003). Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer. Paper presented at SAE World Congress & Exhibition, Detroit, MI, USA United States.

Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer. / Hawley, J G; Cox, A; Brace, C J; Ketcher, D; Stark, R.

2003. Paper presented at SAE World Congress & Exhibition, Detroit, MI, USA United States.

Research output: Contribution to conferencePaper

Hawley, JG, Cox, A, Brace, CJ, Ketcher, D & Stark, R 2003, 'Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer' Paper presented at SAE World Congress & Exhibition, Detroit, MI, USA United States, 1/04/08, .
Hawley JG, Cox A, Brace CJ, Ketcher D, Stark R. Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer. 2003. Paper presented at SAE World Congress & Exhibition, Detroit, MI, USA United States.
Hawley, J G ; Cox, A ; Brace, C J ; Ketcher, D ; Stark, R. / Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer. Paper presented at SAE World Congress & Exhibition, Detroit, MI, USA United States.
@conference{7581af71db8549d7b04f80dd928ef100,
title = "Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer",
abstract = "Time-alignment sensitivity studies have been carried out to assess the accuracy of instantaneous mass NOx emissions on a chassis rolls dynamometer. The work is part of a larger project aimed at measuring passive NOx catalyst conversion efficiencies. Instantaneous NOx emissions are examined in relation to the NEDC vehicle speed trace at multi-sampling points, and phase and time alignment issues are highlighted and discussed. It has been found that a small mismatch of the vehicle speed trace to the instantaneous mass of emissions of \mP2 seconds can lead to results indicating that the conversion efficiency is anywhere between 0-20{\%}. Finally, examples are presented showing the difficulties of attempting to adjust the time alignment of raw emissions data.",
author = "Hawley, {J G} and A Cox and Brace, {C J} and D Ketcher and R Stark",
year = "2003",
month = "3",
language = "English",
note = "SAE World Congress & Exhibition ; Conference date: 01-04-2008",

}

TY - CONF

T1 - Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer

AU - Hawley, J G

AU - Cox, A

AU - Brace, C J

AU - Ketcher, D

AU - Stark, R

PY - 2003/3

Y1 - 2003/3

N2 - Time-alignment sensitivity studies have been carried out to assess the accuracy of instantaneous mass NOx emissions on a chassis rolls dynamometer. The work is part of a larger project aimed at measuring passive NOx catalyst conversion efficiencies. Instantaneous NOx emissions are examined in relation to the NEDC vehicle speed trace at multi-sampling points, and phase and time alignment issues are highlighted and discussed. It has been found that a small mismatch of the vehicle speed trace to the instantaneous mass of emissions of \mP2 seconds can lead to results indicating that the conversion efficiency is anywhere between 0-20%. Finally, examples are presented showing the difficulties of attempting to adjust the time alignment of raw emissions data.

AB - Time-alignment sensitivity studies have been carried out to assess the accuracy of instantaneous mass NOx emissions on a chassis rolls dynamometer. The work is part of a larger project aimed at measuring passive NOx catalyst conversion efficiencies. Instantaneous NOx emissions are examined in relation to the NEDC vehicle speed trace at multi-sampling points, and phase and time alignment issues are highlighted and discussed. It has been found that a small mismatch of the vehicle speed trace to the instantaneous mass of emissions of \mP2 seconds can lead to results indicating that the conversion efficiency is anywhere between 0-20%. Finally, examples are presented showing the difficulties of attempting to adjust the time alignment of raw emissions data.

M3 - Paper

ER -