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**Starting note on Default RLD parameters**

WLTP-06-26e Starting note on Default RLD parameters Informal Group – WLTP Vienna, 26 –

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**Currently in ECE R83 . . . . . . . 1080 < RW ≤ 1190 1130 6.3 284**

Reference mass of vehicle RW (kg) Equivalent inertia Power and load absorbed by the dynamometer at 80 km/h Road Load Coefficients kg kW N a (N) b(N/kph2) . . . 1080 < RW ≤ 1190 1130 6.3 284 6.4 0.0433 1190 < RW ≤ 1305 1250 6.7 302 6.8 0.0460 1305 < RW ≤ 1420 1360 7.0 315 7.1 0.0481 1420 < RW ≤ 1530 1470 7.3 329 7.4 0.0502 1530 < RW ≤ 1640 1590 7.5 338 7.6 0.0515 1640 < RW ≤ 1760 1700 7.8 351 7.9 0.0536 1760 < RW ≤ 1870 1810 8.1 365 8.2 0.0557 1870 < RW ≤ 1980 1930 8.4 378 8.5 0.0577 1980 < RW ≤ 2100 2040 8.6 387 8.7 0.0591 2100 < RW ≤ 2210 2150 8.8 396 8.9 0.0605 2210 < RW ≤ 2380 2270 9.0 405 9.1 0.0619 2380 < RW ≤ 2610 9.4 423 9.5 0.0646 2610 < RW 9.8 441 9.9 0.0674

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Currently in WLTP 5.2. The default road load force shall be calculated using the following equation: Fc = f0 + f1 x v + f2 x v2 where: Fc is the calculated default road load force for a given vehicle velocity , and it is expressed in Newton (N); F0 is the constant road load coefficient, in N, defined by the equation: F0 = x TM f1 is the first order road load coefficient and shall be equal to zero; F2 is the second order road load coefficient, in N·(h/km)², defined by the equation: F2 = 2.8 x 10-6 x TM x width x height

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Currently in ECE R83

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**Comparison between NEDC dyno load and WLTP road load**

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**No comparison between NEDC dyno load and WLTP road load possible**

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Next Steps The formula in the WLTP gtr was adopted in June 2013 on the understanding that the fixed factors 0.14 , 2.8 x 10-6 and need to be validated During the ongoing EU WLTP Correlation Programme, a Volkswagen Crafter will be tested on NEDC and WLTP in both M1 and N1 configurations This will give a comparison between the road loads experienced from the two test procedures The remaining question is which coastdown data is required by Contracting Parties in order to compare WLTP with real life

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