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Complete version of GTR No. 15 including the proposed Amendment 2 (GRPE/2017/7) and latest refinements by the WLTP informal group (GRPE-74-02). Amendment 2 corresponds to phase 2a development of the GTR, including the following modification to the text: - If an alternative value is applied for a parameter, such as a higher n_min_drive or an ASM, this parameter value has to be the same within an interpolation family (Paragraph 5.6.1.).
- The mass in running order used for the calculation of the power to mass ratio is replaced by mass in running order minus 75 kg (paragraph 1. of Annex 1).
- Idle engine speed n_idle is removed from the power curve measurement requirement (paragraph 2. of Annex 2).
- The additional safety margin (ASM) value may be decided by manufacturer rather than the prescribed exponential curve (paragraph 3.4. of Annex 4).
- The number of decimal place of road load coefficients is defined (paragraph 2.4. of Annex 4).
- Additional restrictions are set to the application of the split run method for coastdown testing (paragraph 4.3.1.3.4. of Annex 4).
- Specific data rejection criteria are added (paragraph 4.3.1.4.3. of Annex 4).
- The “delta method” for road load determination is added (paragraph 6.8. of Annex 4 and other paragraphs. See section 4.4.25.for more detail).
- The roller radius correction factor is modified(paragraph 6.6.3. of Annex 4).
- The allowable combination of the test vehicle selection and family requirements are further clarified (paragraph 4.2.1.3. of Annex 4 and other paragraphs of Annex 4).
- Provisions for an additional cooling fan are included(paragraph 1.1.5. and 1.1.6. of Annex 5).
- The correction of measurement/recording frequency requirements are specified (over several annexes).
- Calculation of the n/v ratio is defined (paragraph 8. of Annex 7).
- The stepwise procedure for calculating the final test results of OVC-HEVs is added (paragraph 4.6. of Annex 8).
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