Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:20:p20
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 20 (pt 20/23)
Character Range: 198278–201092

reference fuel.  This preconditioning is done on the second reference fuel by driving a preconditioning cycle consisting of one Part One (urban part) and two times Part Two (extra-urban part) of the test cycle described in Appendix 1 to this Annex.  On the manufacturer's request and with the agreement of the technical service this preconditioning may be extended.  The dynamometer setting shall be the one indicated in paragraphs 5.1. and 5.2. of this Annex.

           5.3.2. The tyre pressures shall be the same as that specified by the manufacturer and used for the preliminary road test for brake adjustment. The tyre pressure may be increased by up to 50 per cent from the manufacturer's recommended setting in the case of a two-roller dynamometer. The actual pressure used shall be recorded in the test report.

           6.  PROCEDURE FOR BENCH TESTS

           6.1.  Special conditions for carrying out the cycle

           6.1.1.  During the test, the test cell temperature must be between 293 K and 303 K (20 and 30 C). The absolute humidity (H) of either the air in the test cell or the intake air of the engine shall be such that:

                               5.5  H  12.2 (g H20/kg dry air)

           6.1.2. The vehicle shall be approximately horizontal during the test so as to avoid any abnormal distribution of the fuel.

           6.1.3. A current of air of variable speed shall be blown over the vehicle. The blower speed shall be such that, within the operating range of 10 km/h to at least 50 km/h, the linear velocity of the air at the blower outlet is within  5 km/h of the corresponding roller speed. The final selection of the blower shall have the following characteristics:

             Area: at least 0.2 m2;
             Height of the lower edge above ground: approximately 20 cm;
             Distance from the front of the vehicle: approximately 30 cm.

           As an alternative the blower speed shall be fixed at an air speed of at least 6 m/s (21.6 km/h).

           For special vehicles (e.g. vans, off-road), the height of the cooling fan can also be modified at the request of the manufacturer.

           6.1.4. During the test the speed is recorded against time or collected by the data-acquisition system so that the correctness of the cycles performed can be assessed.

           6.2.  Starting-up the engine

           6.2.1.  The engine shall be started up by means of the devices provided for this purpose according to the manufacturer's instructions, as incorporated in the drivers' handbook of production vehicles.

           6.2.2. The first cycle starts on the initiation of the engine start-up procedure.

           6.2.3. In the case of the use of LPG or NG as a fuel it is permissible that the engine is started on petrol and switched to