Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:21:p4
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 21 (pt 4/35)
Character Range: 298251–301128

indicated at 80 km/h in terms of load absorbed at 80 km/h

       2.2.13.  The requirements of paragraphs 2.2.3. to 2.2.12. above shall be repeated for all inertia classes to be used.

2.3.  Calibration of the load indicator at other speeds

  The procedures described in paragraph 2.2. above shall be repeated as often as necessary for the chosen speeds.

2.4.  Calibration of force or torque

  The same procedure shall be used for force or torque calibration.

3.  Verification of the load curve

3.1.  Procedure
                The load-absorption curve of the dynamometer from a reference setting at a speed of 80 km/h shall be verified as follows:

       3.1.1. Place the vehicle on the dynamometer or devise some other method of starting-up the dynamometer.

       3.1.2. Adjust the dynamometer to the absorbed load (F) at 80 km/h.

       3.1.3. Note the load absorbed at 120, 100, 80, 60, 40 and 20 km/h.

       3.1.4. Draw the curve F(V) and verify that it corresponds to the requirements of paragraph 1.1.3.1. of this appendix.

       3.1.5. Repeat the procedure set out in paragraphs 3.1.1. to 3.1.4. above for other values of power F at 80 km/h and for other values of inertias.

Annex 4a - Appendix 2
  Exhaust dilution system
1.  System specification
        1.1.  System Overview

         A full-flow exhaust dilution system shall be used. This requires that the vehicle exhaust be continuously diluted with ambient air under controlled conditions. The total volume of the mixture of exhaust and dilution air shall be measured and a continuously proportional sample of the volume shall be collected for analysis. The quantities of pollutants are determined from the sample concentrations, corrected for the pollutant content of the ambient air and the totalised flow over the test period.

         The exhaust dilution system shall consist of a transfer tube, a mixing chamber and dilution tunnel, a dilution air conditioning, a suction device and a flow measurement device. Sampling probes shall be fitted in the dilution tunnel as specified in Appendices 3, 4 and 5.

         The mixing chamber described above will be a vessel, such as those illustrated in Figures 6 and 7, in which vehicle exhaust gases and the dilution air are combined so as to produce a homogeneous mixture at the chamber outlet.

        1.2.  General Requirements

       1.2.1.  The vehicle exhaust gases shall be diluted with a sufficient amount of ambient air to prevent any water condensation in the sampling and measuring system at all conditions which may occur during a test.

       1.2.2.  The mixture of air and exhaust gases shall be homogeneous at the point where the sampling probe is located (see paragraph 1.3.3. below). The sampling probe shall extract a representative sample of the diluted exhaust gas.

       1.2.3.  The system shall enable the total