Document ID: chunk:federal_register_of_legislation:F2022C00213:reg:18:p4
Version: federal_register_of_legislation:F2022C00213
Segment Type: reg
Provision Reference: reg 18 (pt 4/6)
Character Range: 352833–355830

wind speeds averaging less than 3 m/s with peak speeds less than 5 m/s.  In addition, the vector component of the wind speed across the test track must be less than 2 m/s.  Wind velocity shall be measured at 0.7 m above the track surface.

         3.2.  Humidity

           The track shall be dry.

         3.3.  Reference conditions

           Barometric pressure  H0 = 100 kPa
           Temperature   T0 = 293 K (20 C)
           Air density  d0 = 1.189 kg/m3

         3.3.1. Air density

         3.3.1.1. The air density during the test, calculated as described in paragraph 3.3.1.2. below, shall not differ by more than 7.5 per cent from the air density under the reference conditions.

         3.3.1.2. The air density shall be calculated by the formula:

           where:
            dT is the air density during the test (kg/m3)
            d0 is the air density at reference conditions (kg/m3)
            HT is the total barometric pressure during the test (kPa)
            TT is absolute temperature during the test (K).

         3.3.2. Ambient conditions

         3.3.2.1. The ambient temperature shall be between 5 C (278 K) and 35 C (308 K) and the barometric pressure between 91 kPa and 104 kPa.  The relative humidity shall be less than 95 per cent.

         3.3.2.2. However, with the manufacturer's agreement, the tests may be made at lower ambient temperatures down to 1 C.  In this case the correction factor calculated for 5 C should be used.

         4.  PREPARATION OF THE VEHICLE

         4.1.  Running-in

           The vehicle shall be in normal running order and adjustment after having been run in for at least 300 km.  The tyres shall be run in at the same time as the vehicle or shall have a tread depth within 90 and 50 per cent of the initial tread depth.

         4.2.  Checks

           The following checks shall be made in accordance with the manufacturer's specifications for the use considered:  wheels, wheel rims, tyres (make, type, pressure), front axle geometry, brake adjustment (elimination of parasitic drag), lubrication of front and rear axles, adjustment of the suspension and vehicle ground clearance, etc.  Check that during freewheeling, there is no electrical braking.
         4.3.  Preparation for the test

         4.3.1. The vehicle shall be loaded to its test mass including driver and measurement equipments, spread in a uniform way in the loading areas.

         4.3.2. The windows of the vehicle shall be closed.  Any covers for air conditioning systems, headlamps, etc. shall be closed.

         4.3.3. The vehicle shall be clean.

         4.3.4. Immediately before the test, the vehicle shall be brought to the normal running temperature in an appropriate manner.

         5.  SPECIFIED SPEED V

           The specified speed is required for determining the running resistance at the reference speed from the running resistance curve.  To determine the running resistance as a function of vehicle speed in