Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p3
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 3/56)
Character Range: 304139–307030

in equation 9 is replaced with nPmax  1.02

 n95h is replaced with nPmax  1.02
       Figure 4:
       Definition of test speeds

       Figure 5
       Definition of npref

7.4.7. Denormalization of engine torque

 The torque values in the engine dynamometer schedule of Appendix 1 to this annex (WHTC) and in Table 1 (WHSC) are normalized to the maximum torque at the respective speed. For generating the reference cycles, the torque values for each individual reference speed value as determined in paragraph 7.4.6. shall be denormalized, using the mapping curve determined according to paragraph 7.4.3., as follows:
 (10)

 Where:

 Mnorm,i is the normalized torque, per cent

 Mmax,i is the maximum torque from the mapping curve, Nm

 Mf,i is the torque absorbed by auxiliaries/equipment to be fitted, Nm

 Mr,i is the torque absorbed by auxiliaries/equipment to be removed, Nm

If auxiliaries/equipment are fitted in accordance with paragraph 6.3.1. and Appendix 6 to this annex, Mf  and Mr are zero.

 The negative torque values of the motoring points (m in Appendix 1 to this annex) shall take on, for purposes of reference cycle generation, reference values determined in either of the following ways:
(a) Negative 40 per cent of the positive torque available at the associated speed point;
(b) Mapping of the negative torque required to motor the engine from maximum to minimum mapping speed;
(c) Determination of the negative torque required to motor the engine at idle and at nhi and linear interpolation between these two points.

7.4.8. Calculation of reference cycle work

 Reference cycle work shall be determined over the test cycle by synchronously calculating instantaneous values for engine power from reference speed and reference torque, as determined in paragraphs 7.4.6. and 7.4.7. Instantaneous engine power values shall be integrated over the test cycle to calculate the reference cycle work Wref (kWh). If auxiliaries are not fitted in accordance with paragraph 6.3.1., the instantaneous power values shall be corrected using equation 4 in paragraph 6.3.5.

 The same methodology shall be used for integrating both reference and actual engine power. If values are to be determined between adjacent reference or adjacent measured values, linear interpolation shall be used. In integrating the actual cycle work, any negative torque values shall be set equal to zero and included. If integration is performed at a frequency of less than 5 Hz, and if, during a given time segment, the torque value changes from positive to negative or negative to positive, the negative portion shall be computed and set equal to zero. The positive portion shall be included in the integrated value.

7.5. Pre-test procedures

7.5.1. Installation of the measurement equipment

 The instrumentation and sample probes shall be installed as required. The tailpipe shall be connected to