Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:6600:p25
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 6600 (pt 25/28)
Character Range: 861647–864882

over a complete WLTC Class 3 cycle.
              If more than one transmission is included in the road load family, a transmission with the highest power losses shall be used for road load determination.
              4.2.1.2.3.4. If the road load delta of the vehicle option causing the friction difference is determined according to paragraph 6.8. of this annex, a new road load family shall be calculated which includes the road load delta in both vehicle L and vehicle H of that new road load family.
               where:
               N refers to the road load coefficients of the new road load family;
                  R refers to the road load coefficients of the reference road load family;
                  Delta refers to the delta road load coefficients determined in paragraph 6.8.1. of this annex.
4.2.1.3. Allowable combinations of test vehicle selection and family requirements
              Table A4/1 shows the permissible combinations of test vehicle selection and family requirements as described in paragraphs 4.2.1.1. and 4.2.1.2. of this annex.
Table A4/1
Permissible combinations of test vehicle selection and family requirements
Requirements to be fulfilled:  (1) w/o interpolation method         (2) Interpolation method w/o road load family  (3) Applying the road load family    (4) Interpolation method using one or more road load families
Road load test vehicle         Paragraph 4.2.1.1.1. of this annex.  Paragraph 4.2.1.1.2. of this annex.            Paragraph 4.2.1.1.2. of this annex.  n.a.

Family                         Paragraph 4.2.1.2.1. of this annex.  Paragraph 4.2.1.2.2. of this annex.            Paragraph 4.2.1.2.3. of this annex.  Paragraph 4.2.1.2.2. of this annex.

Additional                     none                                 none                                           none                                 Application of column (3) "Applying the road load family" and application of paragraph 4.2.1.3.1. of this annex.

              4.2.1.3.1. Deriving road loads of an interpolation family from a road load family
              Road loads HR and/or LR shall be determined according to this annex.
              The road load of vehicle H (and L) of an interpolation family within the road load family shall be calculated according to paragraphs 3.2.3.2.2. to 3.2.3.2.2.4. inclusive of Annex B7 by:
                  (a) Using HR and LR of the road load family instead of H and L as inputs  for the equations;
                  (b) Using the road load parameters (i.e. test mass, Δ(CD ×Af) compared to vehicle LR, and tyre rolling resistance) of vehicle H (or L) of the interpolation family as inputs for the individual vehicle;
                  (c) Repeating this calculation for each H and L vehicle of every interpolation family within the road load family.
              The road load interpolation shall only be applied on those road load-relevant characteristics that were identified to be different between test vehicle LR and HR. For other road load-relevant characteristic(s), the value of vehicle HR shall apply.
              H and L of the interpolation family may be derived from different road load families. If that difference between these road load