Emission Factors Determination of Euro III 1,200- to 1,400-cc Petrol Passenger Cars with a PLS Multivariate Regression Model |
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Authors: | M Rapone M V Prati M A Costagliola L Della Ragione G Meccariello |
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Institution: | (1) CNR Istituto Motori – Via Marconi, 8-80125 Napoli, Italy |
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Abstract: | This paper presents emission factors of a class of passenger cars obtained by applying a statistical model developed to evaluate
average emission factors based on driving cycle emission measurements. A multivariate regression method based on principal
components, namely, the partial least squares (PLS) method, is applied to calculate the model. The method was applied to emission
data from a sample of petrol Euro III 1,200- to 1,400-cc passenger cars taken from the ARTEMIS database. A vehicle effect
analysis showed that vehicle effect is considerable, in some cases comparable to or greater than the driving cycle effect.
Determination of emission factors is obviously affected by these aspects. Thus, the CO2 PLS model fit results are good, CO,
HC and NOX more or less sufficient. PLS-predicted quantities were compared with corresponding quantities estimated by a multiple
regression model (GLM) based on a quadratic polynomial equation of sub-cycle overall mean speed. GLM goodness of fit was poorer
than PLS ones. A validation effort of models is in progress, which is considering the ARTEMIS database extended with tests
performed within other national or international projects. In this way, an extended population of combinations of vehicles
and driving cycles will provide a better calculation of models and emission factors. |
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Keywords: | " target="_blank"> Emission factors ARTEMIS Hierarchical statistical model Partial least squares (PLS) |
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