Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p20
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 61332–64128

2 gears. If the engine has 230kW then (x/n) = (8 x 2)/3 = 16/3 = 5 1/3. The initial test gear ratio is 6th (includes the gears from both the main transmission and auxiliary which is 6th out of the 16 total gear ratios), with the next gear ratio is 7th up to ratio X.
            In the case of vehicles having different overall gear ratios the representative of the vehicle type by the test vehicle is determined as follows:
            if the highest sound level is obtained between the ratio x/n and ratio X the vehicle shall be deemed representative of its type;
            if the highest sound level is obtained at ratio x/n the vehicle selected shall be deemed representative of its type only for those vehicles which have a lower overall gear ratio at x/n;
            if the highest sound level is obtained at ratio X the vehicle selected shall be deemed representative of its type only for those vehicles which have a higher overall gear ratio than the gear ratio X.
            However the vehicle is deemed representative of its type also, if at the applicant's request the tests are extended over more ratios than foreseen, and the highest sound level is obtained between the extreme ratios tested.

           3.1.2.4. Automatic transmission [13]/

           3.1.2.4.1. Vehicles without a manual selector

           3.1.2.4.1.1. Approach speed

            The vehicle shall approach the line AA' at various uniform speeds of 30, 40, 50 km/h or at 3/4 of the maximum on-road speed if this value is lower.
            If the vehicle is equipped with an automatic transmission which cannot be tested with the procedure outlined in the subsequent sections, it shall be tested at different approach speeds, namely 30km/h, 40km/h, and 50km/h, or at three quarters of maximum vehicle speed as specified by the manufacturer if this value is lower. The condition giving the highest noise level shall be retained.

           3.1.2.4.2. Vehicles equipped with a manual selector with X positions

           3.1.2.4.2.1. Approach speed

            The vehicle shall approach the line AA' at a steady speed corresponding to the lower of the following velocities with a tolerance +/- 1km/h; except where the controlling factor is engine speed the tolerance shall be the larger of +/- 2% or +/- 50 rpm, such that:
            either VA = 50 km/h;
            or VA corresponding to NA = 3/4 S and
            VA < 50 km/h
            in the case of vehicles of categoryM1 and in the case of vehicles of categories other than M1, having an 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,