Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:20:p7
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 20 (pt 7/19)
Character Range: 241558–245063

The measurement points lie on the radial centre line of each arc (22.5°) at a radius of two thirds of the total (as shown in the diagram below).

                  Each value at those points shall be within 10 per cent of the averaged value of themselves.

               The device used to measure the linear velocity of the air shall be located at between 0 and 20 cm from the air outlet.

               The final selection of the blower shall have the following characteristics:
               (i) Area: at least 0.2 m2;
               (ii) Height of the lower edge above ground: approximately 0.2 m;
               (iii) Distance from the front of the vehicle: approximately 0.3 m.
               As an alternative, at the request of the manufacturer the blower speed shall be fixed at an air speed of at least 6 m/s (21.6 km/h).
               The height and lateral position of the cooling fan can also be modified at the request of the manufacturer.
              4. Test equipment
              4.1. Chassis dynamometer
               The chassis dynamometer requirements are given in Appendix 1.
              4.2. Exhaust dilution system
               The exhaust dilution system requirements are given in Appendix 2.
              4.3. Gaseous emissions sampling and analysis
               The gaseous emissions sampling and analysis equipment requirements are given in Appendix 3.
              4.4. Particulate Mass (PM) emissions equipment
               The particulate mass sampling and measurement requirements are given in Appendix 4.
              4.5. Particle Number (PN) emissions equipment
               The particle number sampling and measurement requirements are given in Appendix 5.
              4.6. General test cell equipment
               The following temperatures shall be measured with an accuracy of 1.5 K:
               (a) Test cell ambient air;
               (b) Intake air to the engine;
               (c) Dilution and sampling system temperatures as required for emissions   measurement systems defined in Appendices 2 to 5 of this annex.
               The atmospheric pressure shall be measurable to within 0.1 kPa.
               The absolute humidity (H) shall be measurable to within 5 per cent.
              5. Determination of vehicle road load
              5.1. Test procedure
               The procedure for measuring the vehicle road load is described in Appendix 7.
               This procedure is not required if the chassis dynamometer load is to be set according to the reference mass of the vehicle.

              6. Emissions test procedure
              6.1. Test cycle
               The operating cycle, made up of a Part One (urban cycle) and Part Two (extra-urban cycle), is illustrated in Figure 1. During the complete test the elementary urban cycle is run four times followed, by Part Two.
              6.1.1. Elementary urban cycle
               Part One of the test cycle comprises 4 times the elementary urban cycle which is defined in Table 1, illustrated in Figure 2, and summarized below.
              Breakdown by phases:
                                               Time (s)         per cent
       Idling                                  60               30.8             35.4
       Deceleration, clutch disengaged         9                4.6
       Gear-changing                           8                4.1
       Accelerations                           36               18.5
       Steady-speed periods