Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:6:p2
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 6 (pt 2/4)
Character Range: 878108–881222

added to the tyre pressure defined in paragraph 4.2.2.3. of this annex, kPa;
                  0.8 is the pressure adjustment factor, kPa/°C;
                  Tsoak is the tyre soaking temperature, °C;
                  Tamb is the test ambient temperature, °C.
                  (c) Between the pressure adjustment and the vehicle warm-up, the tyres shall be shielded from external heat sources including sun radiation.
              4.2.3. Instrumentation
              Any instruments shall be installed in such a manner as to minimise their effects on the aerodynamic characteristics of the vehicle.
              If the effect of the installed instrument on (CD × Af) is expected to be greater than 0.015 m2, the difference in the value of (CD × Af) of the vehicle with and without the instrument shall be measured in a wind tunnel fulfilling the criteria in paragraph 3.2. of this annex. The corresponding difference shall be subtracted from f2. At the request of the manufacturer, and with approval of the responsible authority, the determined value may be used for similar vehicles where the influence of the equipment is expected to be the same.
              4.2.4. Vehicle warm-up
              4.2.4.1. On the road
           Warming up shall only be performed by driving the vehicle.
              4.2.4.1.1. Before warm-up, the vehicle shall be decelerated with the clutch disengaged or an automatic transmission placed in neutral by moderate braking from 80 to 20 km/h within 5 to 10 seconds. After this braking, there shall be no further actuation or manual adjustment of the braking system.
              At the request of the manufacturer and upon approval of the responsible authority, the brakes may also be activated after the warm-up with the same deceleration as described in this paragraph and only if necessary.
4.2.4.1.2. Warming up and stabilization
              All vehicles shall be driven at 90 per cent of the maximum speed of the applicable WLTC. The vehicle may be driven at 90 per cent of the maximum speed of the next higher phase (see Table A4/3) if this phase is added to the applicable WLTC warm-up procedure as defined in paragraph 7.3.4. of this annex. The vehicle shall be warmed up for at least 20 minutes until stable conditions are reached.
Table A4/3
Warming-up and stabilization across phases (as applicable)
Cycle class             Applicable WLTC                       90 per cent of maximum speed  Next higher phase
Class 1                 Low1 + Medium1                        58 km/h                       NA
Class 2                 Low2 + Medium2 + High2 + Extra High2  111 km/h                      NA
Low2 + Medium2 + High2  77 km/h                               Extra High (111 km/h)
Class 3                 Low3 + Medium3 + High3 + Extra High3  118 km/h                      NA
Low3 + Medium3 + High3  88 km/h                               Extra High (118 km/h)

              4.2.4.1.3. Criterion for stable condition
           Refer to paragraph 4.3.1.4.2. of this annex.
              4.3. Measurement and calculation of road load using the coastdown