Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:20:p6
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 20 (pt 6/19)
Character Range: 208101–210967

to ensure that carburation is not affected by an accidental intake of air.
              3.2.4. The settings of the engine and of the vehicle's controls shall be those prescribed by the manufacturer. This requirement also applies, in particular, to the settings for idling (rotation speed and carbon monoxide content of the exhaust gases), for the cold start device and for the exhaust gas cleaning system.
              3.2.5. The vehicle to be tested, or an equivalent vehicle, shall be fitted, if necessary, with a device to permit the measurement of the characteristic parameters necessary for chassis dynamometer setting, in conformity with paragraph 5. of this annex.
              3.2.6. The technical service responsible for the tests may verify that the vehicle's performance conforms to that stated by the manufacturer, that it can be used for normal driving and, more particularly, that it is capable of starting when cold and when hot.
              3.3. Test fuel
              3.3.1. The appropriate reference fuel as defined in Annex 10 to this Regulation shall be used for testing.
              3.3.2. Vehicles that are fuelled either with petrol or with LPG or NG/biomethane shall be tested according to Annex 12 with the appropriate reference fuel(s) as defined in Annex 10a.
              3.4. Vehicle installation
              3.4.1. The vehicle shall be approximately horizontal during the test so as to avoid any abnormal distribution of the fuel.
              3.4.2. A current of air of variable speed shall be blown over the vehicle. The blower speed shall be, within the operating range of 10 km/h to at least 50 km/h, or as an alternative, at the request of the manufacturer within the operating range of 10 km/h to at least the maximum speed of the test cycle being used. The linear velocity of the air at the blower outlet shall be within ±5 km/h of the corresponding roller speed within the range of 10 km/h to 50 km/h. At the range over 50 km/h, the linear velocity of the air shall be within ±10 km/h of the corresponding roller speed. At roller speeds of less than 10 km/h, air velocity may be zero.
               The above mentioned air velocity shall be determined as an averaged value of a number of measuring points which:
               (a) For blowers with rectangular outlets are located at the centre of each   rectangle dividing the whole of the blower outlet into 9 areas (dividing                             both horizontal and vertical sides of the blower outlet into 3 equal                             parts);
                  (b) For circular blower outlets, the outlet shall be divided into 8 equal arcs by vertical, horizontal and 45° lines. The measurement points lie on the radial centre line of each arc (22.5°) at a radius of two thirds of the total (as shown in the diagram below).

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