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Concept for introducing the Weighting Factors for L/M/H/ExH phase

WLTP-DHC-13-05. Concept for introducing the Weighting Factors for L/M/H/ExH phase. Prepared by Japan 13 th DHC group under GRPE/WLTP informal group 5 June 2012 the Palais des Nations (Geneva/Switzerland). Introducing Weighting Factors.

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Concept for introducing the Weighting Factors for L/M/H/ExH phase

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  1. WLTP-DHC-13-05 Concept for introducing the Weighting Factors for L/M/H/ExH phase Prepared by Japan 13th DHC group under GRPE/WLTP informal group 5 June 2012 the Palais des Nations (Geneva/Switzerland)

  2. Introducing Weighting Factors • The proportions of each phase are different among countries/regions. • In order to adjust the proportions into the actual traffic conditions in each countries/regions, the ratios of each phases (“Weighting Factors”) should be introduced. WLTC-ver.5 (Validation 2 is currently being conducted.) “Weighting Factors” was listed as one of the “Open Issues” at the 62nd GRPE meeting in June 2011. But, this issue has not been discussed well yet.

  3. What is the Weighting Factors? The test procedure(including cycle) is one and only in the world. Test results measured according to the WLTP Fuel consumption:○○L/100km NOx:○○g/km Fuel consumption:○○L/100km NOx:○○g/km Fuel consumption:○○L/100km NOx:○○g/km Fuel consumption:○○L/100km NOx:○○g/km ×α% ×β% ×γ% ×δ% Weighting Factors =Weighted by some coefficients in each phase Fuel consumption:○○L/100km NOx:○○g/km

  4. Why Weighting Factors are needed? ｒ: Region Calculation of chi-square value in speed/acceleration distribution to compare WLTC-ver.5 with each country data. The gap between WLTC and Japan (as well as Indiaand Korea) is wider than that of EU and US. How can we describe the local characteristics with WLTC? Japan c2=37.41 EU c2=0.510 India c2=NA(> 23.0) Korea US 4 c2=36.78 c2=0.903

  5. Calculation method of the Weighting Factors STEP 1: Convergence calculation of time proportions which give the least chi-square value in speed/acceleration distribution. TPL TPM TPH TPExH Weighted WLTC JP unified distribution the least χ2 value

  6. Calculation method of the Weighting Factors STEP 2: Conversion of time proportion to distance proportion (= Weighting Factors) 【Calculation for Japanese WF】 c2: 37.4  0.58 (Ref.) Calculation for WF in other region c2: 0.51  0.45 c2: >23.0  0.84 c2: 36.8  0.49 6 c2: 0.90  0.70

  7. (Ref) Calculation of fuel consumption and emission Fuel consumption (L/100km) (L/100km) (g/km) Carbon monoxide (g/km)

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