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UN R154: Proposal for new supplement regarding road load determination
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Reference Number: GRPE-92-36/Rev.1
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Proposal to introduce optional calculation method for determining f₀ and f₂ road load coefficients, allow measurement of drivetrain delta on component dynamometer, permit evaluation of split runs to increase data base, and enable test vehicle configuration using interpolation method. The calculation method determines final f₀ and f₂ values considering theoretical delta between coast down vehicle and final vehicle. Component dynamometer measurement increases accuracy because not all combinations of road load relevant components can be assembled, allowing all component combinations to be evaluated independently.
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Submitted by:
OICA
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Meeting Sessions: 92nd GRPE session (25-28
Mar 2025) and 7th WLTP-AH session (29 Sep 2025)
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Document date: 26 Mar 25
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Relevant to: UN Regulation No. 154 | Light Vehicle Emissions Type Approval Test Procedure
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