D5 Annex report WP 3: ETIS Database methodology ... - ETIS plus

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D5 Annex WP 3: DATABASE METHODOLOGY AND DATABASE USER MANUAL – FREIGHT TRANSPORT DEMAND x å e c = ( ps × a s ) × e i, v , k i, v , s i, v , k , s i, v , k s = 1 For the calculation of the corrected hot emissions / consumption of the vehicle fleet, the equation for the basic hot emissions has to be converted to: i = categories æ EC = å ç n × l × p × ec è w å ( ) hot , k i i i , v i , v , k i = 1 v = 1 ö ÷ ø Effectively, the product n i .l i in the above equation corresponds to “vehiclekilometre” (number of vehicles by travel distance) for each vehicle category i. For gasoline (with and without catalyst) and diesel cars (without catalyst), the formula for excess emission (or excess consumption) is in the following form: excess emissions= w×[f(V)+g(T)1]×h(d) engine start temperature (in °C) for starts at an intermediate temperature d = d / d c It is assumed that the excess emission of diesel cars with oxidation catalyst is proportional to the excess emission of diesel cars 118 Document2 27 may 2004
D5 Annex WP 3: DATABASE METHODOLOGY AND DATABASE USER MANUAL – FREIGHT TRANSPORT DEMAND without catalyst, according to the following equation: excess emission for diesel cars with catalyst excess emission for diesel cars without catalyst = a Cold correction E c = å i ( i ) æ cm s, v ç tf i × × w i × è 100 å å å j k m é p × p × p ê ë 10 6 × d j k m m d m × ( f ( V j ) + g ( T k ) - 1 ) × h æ ö ù ö ç ÷ ú ÷ è d c (V j ) ø û ø the following parameters are model internal data: cm (s, vi) percentage of mileage recorded under cold start or intermediate temperature conditions for season s and overall speed vi of vehicle type i (%) wi reference excess emission for vehicle type i (g) j speed class with a cold engine k class of startup engine temperature m trip length class pj percentage of the trips travelled at speed j with a cold engine, for the overall average speed considered (%) pk percentage of the trips travelled with a startup engine temperature Tk (%) pm percentage of trips started with a cold engine and distance dm, for speed Vj with a cold engine (%) dm average distance of the trips under cold start conditions of class m (km) Vj average speed with a cold engine corresponding to class j (km/h) Tk average startup temperature of class k (°C) Document2 27 May 2004 119
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