Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p104
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 104/108)
Character Range: 1182321–1185369

(b) The engine temperature shall be within ± 2 °C of the set point Treg before the start of the ATCT test. That temperature shall be included in all relevant test sheets. In this case, the provision for cool down described in paragraph 3.9. of this Annex B6a and the criteria on engine compartment insulation can be skipped for all vehicles in the family.

              This alternative is not allowed if the vehicle is equipped with an active heat storage device.

              The application of that approach shall be included in all relevant test reports.

              The requirements to document the insulation materials may be waived.

              4.2. ATCT family composed of a single Interpolation family

              In the case, that the ATCT family consists of only one interpolation family, the provision for cool down described in paragraph 3.9. of this Annex B6a can be skipped. This shall be included in all relevant test reports.

              4.3. Alternative engine temperature measurement

              In the case that measuring the coolant temperature is not feasible, on request of the manufacturer and with approval of the approval authority, instead of using the coolant temperature for the provision for cool down described in paragraph 3.9. of this Annex B6a, the engine oil temperature may be used. In that case, for all vehicles within the family the engine oil temperature shall be used.

              The application of that procedure shall be included in all relevant test reports.

Annex B6b

Correction of CO2 results against the target speed and distance
              This annex is only applicable for Level 1A;

              1. General

              This Annex B6b defines the specific provisions regarding the correction of CO2 test results for tolerances against the target speed and distance.

              This Annex B6b applies to pure ICE vehicles only.

              2. Vehicle speed measurement

              2.1. The actual/measured vehicle speed (vmi; km/h) coming from the roller speed of the chassis dynamometer shall be sampled with a measurement frequency of 10 Hz together with the actual time that corresponds to the actual speed.

              2.2. The target speed (vi; km/h) between time points in Tables A1/1 to A1/12 in Annex B1 shall be determined by a linear interpolation method at a frequency of 10 Hz.

              3. Correction procedure

              3.1. Calculation of the actual/measured and target power at the wheels

              The power and the forces at the wheels from the target and actual/measured speed shall be calculated by applying the following equations:

               =  +  x  +  x  + (TM + ) x

               =  x  x 0,001

               =  +  x  +  x  + (TM + ) x

               =  x  x 0,001

               =

               =

              where:

                      is the target driving force during the period from (i-1) to (i), N;

                       is the actual/measured driving force during the period from (i-1) to