Appendix 4

Conformity of CO₂ emissions and fuel consumption related properties shall be checked on the basis of the description in the certificates set out in Appendix 1 to this Annex and on the basis of the description in the information document set out in Appendix 2 to this Annex.

If an engine certificate has had one or more extensions, the tests shall be carried out on the engines described in the information package relating to the relevant extension.

All engines subject to tests shall be taken from the series production meeting the selection criteria according to paragraph 3 of this Appendix.

The tests may be conducted with the applicable market fuels. However, at the manufacturer's request, the reference fuels specified in paragraph 3.2 may be used.

If tests for the purpose of conformity of CO₂ emissions and fuel consumption related properties of gas engines (natural gas, LPG) are conducted with market fuels the engine manufacturer shall demonstrate to the approval authority the appropriate determination of the gas fuel composition for the determination of the NCV according to paragraph 4 of this Appendix by good engineering judgement.

0,05 percent of all engines produced in the past production year within the scope of this regulation shall represent the basis to derive the number of engine CO₂-families and number of engines within those CO₂-families to be tested annually for verifying conformity of the certified CO₂ emissions and fuel consumption related properties. The resulting figure of 0,05 percent of relevant engines shall be rounded to the nearest whole number. This result shall be called n_COP,base.

Notwithstanding the provisions in point 2.1, a minimum number of 30 shall be used for n_COP,base.

The resulting figure for n_COP,base determined in accordance with points 2.1 and 2.2 of this Appendix shall be divided by 10 and the result rounded to the nearest whole number in order to determine the number of engine CO₂-families to be tested annually, n_COP,fam, for verifying conformity of the certified CO₂ emissions and fuel consumption related properties.

In the case that a manufacturer has less CO₂-families than n_COP,fam determined in accordance with point 2.3, the number of CO₂-families to be tested, n_COP,fam, shall be defined by the total number of CO₂-families of the manufacturer.

From the number of engine CO₂-families to be tested determined in accordance with paragraph 2 of this Appendix, the first two CO₂-families shall be those with the highest production volumes.

The remaining number of engine CO₂-families to be tested shall be randomly selected from all existing engine CO₂-families and shall be agreed between the manufacturer and the approval authority.

F1The minimum number of engines to be tested for each engine CO ₂ -family, n _COP,min , shall be determined by dividing n _COP,base by n _COP,fam , both values determined in accordance with point 2. The result for n _COP,min shall be rounded to the nearest integer. If the resulting value for n _COP,min is smaller than 4 it shall be set to 4, if it is greater than 19 it shall be set to 19.

For each of the engine CO₂-families determined in accordance with paragraph 3 of this Appendix a minimum number of n_COP,min engines within that family shall be tested in order to reach a pass decision in accordance with paragraph 9 of this Appendix.

The number of testruns to be performed within an engine CO₂-family shall be randomly assigned to the different engines within that CO₂-family and this assignment shall be agreed between the manufacturer and the approval authority.

Conformity of the certified CO₂ emissions and fuel consumption related properties shall be verified by testing the engines in the WHSC test in accordance with paragraph 4.3.4.

All boundary conditions as specified in this Annex for the certification testing shall apply, except for the following:

1. (1)

   The laboratory test conditions in accordance with paragraph 3.1.1 of this Annex. The conditions in accordance with paragraph 3.1.1 are recommended and shall not be mandatory. Deviations may occur under certain ambient conditions at the testing site and should be minimized by the use of good engineering judgment.

2. (2)

   In case reference fuel of the type B7 (Diesel / CI) in accordance with paragraph 3.2 of this Annex is used, the determination of the NCV in accordance with paragraph 3.2 of this Annex shall not be required.

3. (3)

   In case market fuel or reference fuel other than B7 (Diesel / CI) is used, the NCV of the fuel shall be determined in accordance with the applicable standards defined in Table 1 of this Annex. With exemption of gas engines the NCV measurement shall be performed by only one lab independent from the engine manufacturer instead of two as required in accordance with paragraph 3.2 of this Annex. NCV for reference gas fuels (G ₂₅ /G _R , LPG fuel B) shall be calculated in accordance with the applicable standards in Table 1 of this Annex from the fuel analysis submitted by the reference gas fuel supplier.

4. (4)

   The lubricating oil shall be the one filled during engine production and shall not be changed for the purpose of testing conformity of CO₂ emissions and fuel consumption related properties.

The tests shall be carried out on newly manufactured engines taken from the series production which have a maximum run-in time of 15 hours before the testrun for the verification of conformity of the certified CO₂ emissions and fuel consumption related properties in accordance with paragraph 4 of this Appendix is started.

At the request of the manufacturer, the tests may be carried out on engines which have been run-in up to a maximum of 125 hours. In this case, the running-in procedure shall be conducted by the manufacturer who shall not make any adjustments to those engines.

When the manufacturer requests to conduct a running-in procedure in accordance with point 5.2 of this Appendix it may be carried out on either of the following:

1. (a)

   all the engines that are tested

2. (b)

   newly produced engine, with the determination of an evolution coefficient as follows:

   1. A..

      The specific fuel consumption shall be measured over the WHSC test once on the newly manufactured engine with a maximum run-in time of 15 hours in accordance with point 5.1 of this Appendix and in the second test before the maximum of 125 hours set in point 5.2 of this Appendix on the first engine tested.

   2. B..

      The values for the specific fuel consumption of both tests shall be adjusted to a corrected value in accordance with paragraphs 7.2 and 7.3 of this Appendix for the respective fuel used during each of the two tests.

   3. C..

      The evolution coefficient of the fuel consumption shall be calculated by dividing the corrected specific fuel consumption of the second test by the corrected specific fuel consumption of the first test. The evolution coefficient may have a value less than one.

If the provisions defined in point 5.3 (b) of this Appendix are applied, the subsequent engines selected for testing of conformity of CO₂ emissions and fuel consumption related properties shall not be subjected to the running-in procedure, but their specific fuel consumption over the WHSC determined on the newly manufactured engine with a maximum run-in time of 15 hours in accordance with point 5.1 of this Appendix shall be multiplied by the evolution coefficient.

In the case described in point 5.4 of this Appendix the values for the specific fuel consumption over the WHSC to be taken shall be the following:

1. (a)

   for the engine used for determination of the evolution coefficient in accordance with point 5.3 (b) of this Appendix, the value from the second test

2. (b)

   for the other engines, the values determined on the newly manufactured engine with a maximum run-in time of 15 hours in accordance with point 5.1 of this Appendix multiplied by the evolution coefficient determined in accordance with point 5.3 (b)(C) of this Appendix

Instead of using a running-in procedure in accordance with points 5.2 to 5.5 of this Appendix, a generic evolution coefficient of 0,99 may be used at the request of the manufacturer. In this case the specific fuel consumption over the WHSC determined on the newly manufactured engine with a maximum run-in time of 15 hours in accordance with point 5.1 of this Appendix shall be multiplied by the generic evolution coefficient of 0,99.

If the evolution coefficient in accordance with point 5.3 (b) of this Appendix is determined using the parent engine of an engine family according to paragraphs 5.2.3. and 5.2.4. of Annex 4 to Regulation UN/ECE R.49.06, it may be carried across to all members of any CO₂-family belonging to the same engine family according to paragraph 5.2.3. of Annex 4 to Regulation UN/ECE R.49.06.

The target value to assess the conformity of the certified CO₂ emissions and fuel consumption related properties shall be the corrected specific fuel consumption over the WHSC, SFC_WHSC,corr, in g/kWh determined in accordance with paragraph 5.3.3 and documented in the information document as part of the certificates set out in Appendix 2 to this Annex for the specific engine tested.

The specific fuel consumption over the WHSC, SFC_WHSC, shall be determined in accordance with paragraph 5.3.3 of this Annex from the testruns performed in accordance with paragraph 4 of this Appendix. At the request of the manufacturer the specific fuel consumption value determined shall be modified by applying the provisions defined in points 5.3 to 5.6 of this Appendix.

If market fuel was used during testing in accordance with point 1.4 of this Appendix, the specific fuel consumption over the WHSC, SFC_WHSC, determined in point 7.1 of this Appendix shall be adjusted to a corrected value, SFC_WHSC,corr, in accordance with paragraph 5.3.3.1 of this Annex.

If reference fuel was used during testing in accordance with point 1.4 of this Appendix the special provisions defined in paragraph 5.3.3.2 of this Annex shall be applied to the value determined in point 7.1 of this Appendix.

The measured emission of gaseous pollutants over the WHSC performed in accordance with paragraph 4 shall be adjusted by application of the appropriate deterioration factors (DF's) for that engine as recorded in the Addendum to the F2GB type-approval certificate granted in accordance with Commission Regulation (EU) No 582/2011.

For diesel engines, the limit values for the assessment of conformity of one single engine tested shall be the target value determined in accordance with point (6) + 4 percent.

For gas engines, the limit values for the assessment of conformity of one single engine tested shall be the target value determined in accordance with point (6) + 5 percent.

The emission test results over the WHSC determined in accordance with point 7.4 of this Appendix shall meet the applicable limits values defined in Annex I to Regulation (EC) No 595/2009 for all gaseous pollutants except ammonia, otherwise the test shall be considered void for the assessment of conformity of the certified CO₂ emissions and fuel consumption related properties.

A single test of one engine tested in accordance with paragraph 4 of this Appendix shall be considered as nonconforming if the actual value in accordance with paragraph 7 of this Appendix is higher than the limit values defined in accordance with paragraph 8 of this Appendix.

For the current sample size of engines tested within one CO₂-family in accordance with paragraph 4 of this Appendix the test statistic quantifying the cumulative number of nonconforming tests in accordance with point 9.2 of this Appendix at the n^th test shall be determined.

1. (a)

   If the cumulative number of nonconforming tests at the n^th test determined in accordance with point 9.3 of this Appendix is less than or equal to the pass decision number for the sample size given in Table 4 of Appendix 3 to UN/ECE Regulation 49 Rev.06, a pass decision is reached.

2. (b)

   If the cumulative number of nonconforming tests at the n^th test determined in accordance with point 9.3 of this Appendix is greater than or equal to the fail decision number for the sample size given in Table 4 of Appendix 3 to UN/ECE Regulation 49 Rev.06, a fail decision is reached.

3. (c)

   Otherwise, an additional engine is tested in accordance with paragraph 4 of this Appendix and the calculation procedure in accordance with point 9.3 of this Appendix is applied to the sample increased by one more unit.

If neither a pass nor a fail decision is reached, the manufacturer may at any time decide to stop testing. In that case a fail decision is recorded.