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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 – 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 ) < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW ≤ < RW

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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 = 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 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 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 and 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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