Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:10:p17
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 10 (pt 17/32)
Character Range: 1317147–1320461

the fuel tank before the applicable test cycle, Pa;
                  p2 is the gas pressure in the fuel tank after the applicable test cycle, Pa;
                  T1 is the gas temperature in the fuel tank before the applicable test cycle, K;
                  T2 is the gas temperature in the fuel tank after the applicable test cycle, K;
                  Z1 is the compressibility factor of the gaseous fuel at p1 and T1;
                  Z2 is the compressibility factor of the gaseous fuel at p2 and T2;
                  V is the interior volume of the gaseous fuel tank, m³;
                  d is the theoretical length of the applicable phase or cycle, km.
              6.3. For a vehicle with a positive ignition engine fuelled with petrol (E0)

              6.4. (Reserved)
              6.5.  For a vehicle with a positive ignition engine fuelled with petrol (E10)

              6.6. For a vehicle with a positive ignition engine fuelled with LPG

              6.6.1. If the composition of the fuel used for the test differs from the composition that is assumed for the calculation of the normalised consumption, on the manufacturer's request a correction factor cf may be applied, using the following equation:

              The correction factor, , which may be applied, is determined using the following equation:

              where:
               is the actual H/C ratio of the fuel used.
              6.7. For a vehicle with a positive ignition engine fuelled with NG/biomethane

              6.8. For a vehicle with a compression engine fuelled with diesel (B0)

              6.9. (Reserved)
              6.10. For a vehicle with a compression engine fuelled with diesel (B7)

              6.11. For a vehicle with a positive ignition engine fuelled with ethanol (E85)

              6.12. Fuel consumption for any test fuel may be calculated using the following equation:
              6.13. Fuel consumption for a vehicle with a positive ignition engine fuelled by hydrogen:
              For vehicles fuelled either with gaseous or liquid hydrogen, and with approval of the responsible authority, the manufacturer may choose to calculate fuel consumption using either the equation for FC below or a method using a standard protocol such as SAE J2572.
                         The compressibility factor, Z, shall be obtained from the following table:

                         Table A7/2
                         Compressibility factor Z

                                         p(bar)
            5      100    200    300    400      500    600    700    800    900
       33   0.859  1.051  1.885  2.648  3.365    4.051  4.712  5.352  5.973  6.576
       53   0.965  0.922  1.416  1.891  2.338    2.765  3.174  3.570  3.954  4.329
       73   0.989  0.991  1.278  1.604  1.923    2.229  2.525  2.810  3.088  3.358
       93   0.997  1.042  1.233  1.470  1.711    1.947  2.177  2.400  2.617  2.829
       113  1.000  1.066  1.213  1.395  1.586    1.776  1.963  2.146  2.324  2.498
       133  1.002  1.076  1.199  1.347  1.504    1.662  1.819  1.973  2.124  2.271
       153  1.003  1.079  1.187  1.312  1.445    1.580  1.715  1.848  1.979  2.107
       173  1.003  1.079  1.176  1.285  1.401    1.518  1.636  1.753  1.868  1.981
 T(K)  193  1.003  1.077  1.165  1.263  1.365