Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p19
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 58826–61524

VA corresponding to NA = 1/2 S and
            VA < 50 kW/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.

           3.1.2.3.2. Choice of the gear ratio

           3.1.2.3.2.1. Vehicles of categories M1 and N1 [10]/ fitted with a gearbox having four or less forward gears shall be tested in second gear.

           3.1.2.3.2.2. Vehicles of categories M1 and of N1 1/ fitted with a gearbox having more than four forward gears shall be tested successively in second and third gear. The average value of the sound levels recorded for these two conditions shall be calculated.
            However, vehicles of category M1 having more than four forward gears and equipped with an engine developing a maximum-power greater than 140 kW (ECE) and a permissible maximum-power/maximum-weight ratio greater than 75 kW (ECE) shall be tested only in third gear, provided that the speed at which the rear of the vehicle passes the line BB' in third gear is greater than 61 km/h.
            If during the test in second gear, the engine speed exceeds the engine speed, S, at which the engine develops its rated maximum power, the test must be repeated with an approach speed and/or approach engine speed reduced by steps of 5%S, until the engine speed attained no longer exceeds S.
            If the engine speed S is still attained with an approach speed corresponding to the idle speed, then the test will be performed only in third gear and the relevant results have to be evaluated.

           3.1.2.3.2.3 Vehicles of categories other than M1 and N1, in which the total number of forward gear ratios is x (including those obtained by way of an auxiliary transmission or a multi-gear axle) will be tested sequentially, using the ratio equal to or higher than x/n.[11]/ [12]/
            Initial testing will be carried out using the ratio which is gear (x/n) or the next higher gear ratio if (x/n) is not an integer. The testing shall continue from the gear (x/n) to the next higher gear.
            Shifting up gear ratios from (x/n) shall be terminating when in the gear X in which the rated engine speed is reached just before the rear of the vehicle has passed the line BB'.
            Sample Calculation for Testing: There are 16 forward ratios for drive train having a transmission with 8 gears and an auxiliary transmission with 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