Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p21
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 63874–66821

engine power not greater than 225 kW (ECE);
           or VA corresponding to NA = 1/2 S and
           VA < 50 km/h
           in the case of vehicles not belonging to categoryM1 having an engine power greater than 225 kW (ECE).
                     or, in the case of vehicles powered by an electric motor

            whichever is the lower.
            However, if during the test, in the case of vehicles having more than two separate gears, there is an automatic down-shift to first gear, this down-shift may be avoided, at the manufacturer's choice, according to paragraph 3.1.2.4.2.4.

           3.1.2.4.2.2. Position of the manual selector

            The test shall be conducted with the selector in the position recommended by the manufacturer for 'normal' driving. External downshifting (for example kickdown) shall be excluded.

           3.1.2.4.2.3. Auxiliary gears

            If the vehicle is fitted with an auxiliary manual transmission or a multi-gear axle, the position used for normal urban driving shall be used. In all cases, the special selector's positions for slow movements, parking, or braking shall be excluded.

           3.1.2.4.2.4. Prevention of downshift

            Some vehicles equipped with an automatic transmission (two or more discrete ratios) may downshift to a gear ratio not normally used in urban driving, as defined by the manufacturer. A gear ratio not used for urban driving includes a gear ratio intended for slow movement, parking or braking. In these cases the operator may select any of the following modifications:
              a) increase the vehicle speed v to a maximum of 60km/h in order to avoid such a change down;
              b) maintain the vehicle speed v at 50km/h and limit the fuel supply to the engine to 95% of the supply necessary for full load; this condition is considered to be satisfied;
              (i) in the case of a spark-ignition engine, when the angle of the throttle opening is 90% of the full angle,
              (ii) in the case of a compression-ignition engine, when the fuel supply to the injection pump is limited to 90% of its maximum supply;
              c) establish and use an electronic control that will prevent a downshift to gears lower than those used in normal urban driving as defined by the manufacturer.

           3.1.3. Interpretation of results

            The measurement of noise emitted by the vehicle in motion shall be considered valid if the difference between the two consecutive measurements on the same side of the vehicle is not more than 2dB(A). [14]/
            The figure recorded shall be that corresponding to the highest sound level. Should that figure exceed by more than 1dB(A) the maximum sound level authorized for the category of vehicle tested, a second series of two measurements at the corresponding microphone position shall be made. Three out of the four results so obtained in this second position must