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Published byQuinn Toney Modified over 2 years ago

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Starting note on Default RLD parameters Informal Group – WLTP Vienna, 26 – 28.03.2014 WLTP-06-26e

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Currently in ECE R83 Reference mass of vehicle RW (kg) Equivalent inertia Power and load absorbed by the dynamometer at 80 km/h Road Load Coefficients kgkWNa (N)b(N/kph 2 )..... 1080 < RW ≤ 119011306.32846.40.0433 1190 < RW ≤ 130512506.73026.80.0460 1305 < RW ≤ 142013607.03157.10.0481 1420 < RW ≤ 153014707.33297.40.0502 1530 < RW ≤ 164015907.53387.60.0515 1640 < RW ≤ 176017007.83517.90.0536 1760 < RW ≤ 187018108.13658.20.0557 1870 < RW ≤ 198019308.43788.50.0577 1980 < RW ≤ 210020408.63878.70.0591 2100 < RW ≤ 221021508.83968.90.0605 2210 < RW ≤ 238022709.04059.10.0619 2380 < RW ≤ 261022709.44239.50.0646 2610 < RW22709.84419.90.0674

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Currently in WLTP 5.2. The default road load force shall be calculated using the following equation: Fc = f 0 + f 1 x v + f 2 x v 2 where: F c is the calculated default road load force for a given vehicle velocity, and it is expressed in Newton (N); F 0 is the constant road load coefficient, in N, defined by the equation: F 0 = 0.140 x TM f 1 is the first order road load coefficient and shall be equal to zero; F 2 is the second order road load coefficient, in N·(h/km)², defined by the equation: F 2 = 2.8 x 10 -6 x TM + 0.017 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 WLTP NEDC

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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 0.017 need to be validated During the ongoing EU WLTP Correlation Programme, a Volkswagen Crafter will be tested on NEDC and WLTP in both M 1 and N 1 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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