Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p20
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 20/150)
Character Range: 769903–772990

such that:
              Where Δt is the data sampling period, equal to 1 second or less.
       A.1.4.2.1. Calculation of the specific emissions

              The specific emissions e (mg/kWh or #/kWh) shall be calculated for each window and each pollutant in the following way:

              where:

                         m is the mass emission of the pollutant, mg/window, or the PM number, #/window

                         W(t2,i) – W(t1,i) is the engine work during the ith averaging window, kWh.

              A.1.4.2.1.1. Calculation of the specific emissions for a declared market fuel

              If a test pursuant to this annex was performed with a market fuel declared in paragraph 3.2.2.2.1. of Part 1 of Annex 1, the specific emissions e (mg/kWh or #/kWh) shall be calculated for each window and each pollutant by multiplying the specific emissions determined in accordance with paragraph A.1.4.2.1. with the power correction factor determined pursuant to paragraph 4.6.2.(b) of this Regulation.
              A.1.4.2.1.1. Calculation of the specific emissions for a declared market fuel

               If a test according to this Annex was performed with a market fuel declared in paragraph 3.2.2.2.1. of Part 1 of Annex 1 to this Regulation and a power correction factor in accordance with paragraph 3.2.2.2.2. of Part 1 of Annex 1 to this Regulation was documented for the market fuel used for the test, the specific emissions egas (mg/kWh) shall be calculated for each window and each pollutant by multiplication of the specific emissions with the declared power correction factor.

              A.1.4.2.2. Selection of valid windows
              A.1.4.2.2.1. Before the dates referred to in paragraph 13.2.5. of this Regulation for new type approvals and paragraph 13.3.4. for new registrations, paragraphs A.1.4.2.2.1.1. to A.4.2.2.1.4. shall apply.
              A.1.4.2.2.1.1.The valid windows are the windows whose average power exceeds the power threshold of 20 per cent of the maximum engine power. The percentage of valid windows shall be equal or greater than 50 per cent.

              A.1.4.2.2.1.2. If the percentage of valid windows is less than 50 per cent, the data evaluation shall be repeated using lower power thresholds. The power threshold shall be reduced in steps of 1 per cent until the percentage of valid windows is equal to or greater than 50 per cent.

              A.1.4.2.2.1.3. In any case, the lower threshold shall not be lower than 15 per cent.

              A.1.4.2.2.1.4. The test shall be void if the percentage of valid windows is less than 50 per cent at a power threshold of 15 per cent.

              A.1.4.2.2.2. From the dates referred to in paragraph 13.2.5. of this Regulation for new type approvals and paragraph 13.3.4. for new registrations, paragraphs A.1.4.2.2.2.1. and A.1.4.2.2.2.2. shall apply.
              A.1.4.2.2.2.1.The valid windows are the windows whose average power exceeds the power threshold of 10 per cent of the maximum engine power.
              A.1.4.2.2.2.2.The test shall be void