CO2-based response emission modelling
conference paper
With a shift to on-road emission testing, both for European legislation (RDE Real Driving Emissions) as in the TNO in-house test program, emission modelling demands for a PEMS-based approach. In comparison to NEDC-based emission modelling, the emission variations in PEMS test results depend on many more aspects, such as emission control strategy, varying ambient conditions, and varying road loads, road surface, tyre pressure, wind, etc.. The need for a development in emission modelling is dictated by the new emission data. In part this might also be due to complex engine control strategies, which result in some cases in different pollutant emissions for apparently similar vehicle operation. (Roocroft 2014) To disentangle external circumstances and the intrinsic variation data should be presented and used in the normalized variables. The most common variable are the specific emissions, i.e., NOx:CO2 [g/g] ratio. In the simplest approximations the ratio is assumed constant. (Ligterink, 2012) This principle is central in the response modelling approach (Wiener 1949, Polderman 1998) : the variations in the pollutant emissions over time is peeled off as deviations, in all manners, from the fixed ratio of pollutant emissions and CO2.
TNO Identifier
867888
Source title
Conference: Transport and Air Polution Conference, At Graz, Austra
Pages
1-10
Files
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