1 WLTP Open Issue Phase 1B Issue: Generic formula for hydrocarbon density. JAPAN Informal Document WLTP-07-12e

2 Counter-Proposal by It would be better to have generic formula for all fuel dependent coefficients (HC densities, dilution factors, fuel consumption, Willans factors), however, it is acceptable to add generic formula for HC densities with clarification of its usage to avoid unnecessary confusion. 1. Add specific densities for E10 and B7 into section of Annex 7 (same as EU registration) 2. Add section of Annex 7 with slight modification. 3. Modify section and of Annex 7 3. Need experts input for Willans factors for E10 and B7 (Annex6/Appendix2) 4. In case of new reference fuel, the following sections need to be amended (1) Annex6/Appendix2 (2) Annex7 Section , and 6 EU registrationGeneric formula for petrol (E10) ρ=0.645 g/ for diesel (B5) ρ=0.622 g/ for diesel (B7) ρ=0.623 g/

The mass M of gaseous compounds emitted by the vehicle during the test shall be determined by obtaining the product of the volumetric concentration of the gas in question and the volume of the diluted exhaust gas with due regard for the following densities under the reference conditions of K and kPa: Carbon monoxide (CO) ρ=1.25g/l Carbon dioxide (CO2) ρ=1.964 g/l Hydrocarbons: for petrol (E0) (C1H1.85) ρ=0.619 g/1 for petrol (E5) (C1H1.89O0.016) ρ=0.631 g/1 for petrol (E10) (C1H1.93O0.033) ρ=0.645 g/1 for diesel (B0) (C1Hl.86) ρ=0.619 g/1 for diesel (B5) (C1Hl.86O0.005) ρ=0.622 g/1 for diesel (B7) (C1Hl.86O0.007) ρ=0.623 g/1 g/1 for LPG (C1H2.525) ρ=0.649 g/l for NG/biomethane (CH4) ρ=0.714 g/l for ethanol (E85) (C1H2,74O0.385) ρ=0.932 g/l Nitrogen oxides (NOx) ρ=2.05 g/1 Nitrogen dioxide (NO2) ρ=2.05 g/1 Nitrous oxide (N2O) ρ=1.964 g/1 The density for NMHC mass calculations shall be equal to that of total hydrocarbons at K and kPa and is fuel-dependent In case the specific density is not available in section , general equation for the hydrocarbons densities (ρ) for each reference fuel with an average composition of CxHyOz is: ρHC: density of total hydrocarbons [g/l] MWC: molecular weight of carbon = g/mol MWH: molecular weight of hydrogen = g/mol MWO: molecular weight of oxygen = g/mol VM: molar volume for an ideal gas at 0°C and kPa = l/mol H/C: ratio of hydrogen to carbon for a specific fuel CxHyOz O/C: ratio of oxygen to carbon for a specific fuel CxHyO Annex 7

The dilution factor, DF, is calculated as follows: 13.4 for petrol (E0, E5 and E10) and diesel(B0) (5a) 13.5 for diesel (B5 and B7) (5b) for LPG (5c) for NG/biomethane (5d) for ethanol (E85) (5e) In case difference fuel other than listed in section general equation for the dilution Annex 6 -Appendix 2 Add E10 and B7 but no idea for these Willans factors. Is general equation for Willans factors available ? 6. Calculation of fuel consumption Is general equation for fuel consumption calculation available ? For a vehicle with a positive ignition engine fuelled with ethanol (E85) “(0.273 *)” shall be “(0.273 * CO 2 )”