Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:9:p3
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 9 (pt 3/71)
Character Range: 214836–217599

phase should also protect the actual measurement against the influence of deposits in the exhaust system from a former test.

              When the engine is stabilised, the cycle shall be started within 20 ± 2 s after the preconditioning phase. At the manufacturers request, a dummy test may be run for additional conditioning before the measurement cycle.

         (1) The test points shall be selected using approved statistical methods of randomisation.

3.3.2.                        Test sequence

              The test consists of a sequence of three load steps at each of the three engine speeds A (cycle 1), B (cycle 2) and C (cycle 3) determined in accordance with Annex III, Section 1.1, followed by cycle 4 at a speed within the control area and a load between 10 % and 100 %, selected by the Technical Service. The following sequence shall be followed in dynamometer operation on the test engine, as shown in Figure 3.

        Figure 3

        Sequence of ELR test

                (a)    The engine shall be operated at engine speed A and 10 per cent load for 20 ± 2 s. The specified speed shall be held to within ± 20 rpm and the specified torque shall be held to within ± 2 % of the maximum torque at the test speed.

                (b)    At the end of the previous segment, the speed control lever shall be moved rapidly to, and held in, the wide open position for 10 ± 1 s. The necessary dynamometer load shall be applied to keep the engine speed within ± 150 rpm during the first 3 s, and within ± 20 rpm during the rest of the segment.

                (c)    The sequence described in (a) and (b) shall be repeated two times.

                (d)    Upon completion of the third load step, the engine shall be adjusted to engine speed B and 10 per cent load within 20 ± 2 s.

                (e)    The sequence (a) to (c) shall be run with the engine operating at engine speed B.

                (f)     Upon completion of the third load step, the engine shall be adjusted to engine speed C and 10 per cent load within 20 ± 2 s.

                (g)    The sequence (a) to (c) shall be run with the engine operating at engine speed C.

                (h)    Upon completion of the third load step, the engine shall be adjusted to the selected engine speed and any load above 10 per cent within 20 ± 2 s.

                (i)     The sequence (a) to (c) shall be run with the engine operating at the selected engine speed.

3.4.                            Cycle validation

              The relative standard deviations of the mean smoke values at each test speed (SVA, SVB, SVC, as calculated   in accordance with Section 6.3.3 of this Appendix from the three successive