Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p18
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 18/39)
Character Range: 1202740–1205715

(incl. the PM number limit) over the WHSC test-cycle applicable to HDDF Type 2B engines operating in diesel mode are those defined for CI engines in paragraph 5.3. of this Regulation.

              5.2.2. Emission limits applicable over the WHTC test-cycle

              5.2.2.1. Emission limits for CO, NOx, NH3 and PM mass

              The CO, NOx, NH3 and PM mass emission limits over the WHTC test-cycle applicable to HDDF Type 2A engines and HDDF Type 2B engines operating in dual-fuel mode are those applicable to both CI and PI engines over the WHTC test-cycle and defined in paragraph 5.3. of this Regulation.

       5.2.2.2. Emission limits for Hydrocarbons

       5.2.2.2.1. NG engines

              The THC, NMHC and CH4 emission limits over the WHTC test-cycle applicable to HDDF Type 2A engines and HDDF Type 2B engines operating with Natural Gas in dual-fuel mode are calculated from those applicable to CI and PI engines over the WHTC test-cycle and defined in paragraph 5.3. of this Regulation. The calculation procedure is specified in paragraph 5.3. of this annex.

       5.2.2.2.2. LPG engines

              The THC emission limits over the WHTC test-cycle applicable to HDDF Type 2A engines and HDDF Type 2B engines operating with LPG  in dual-fuel mode are those applicable to CI engines over the WHTC test-cycle and defined in paragraph 5.3. of this Regulation.

       5.2.2.3. Emission limits for PM number

              5.2.2.3.1. The PM number limit over the WHTC test-cycle applicable to HDDF Type 2A engines and HDDF Type 2B engines operating in dual-fuel mode are those applicable to CI engines over the WHTC test-cycle and defined in paragraph 5.3. of this Regulation. In the case a PM number limit applicable to PI engines over the WHTC test-cycle would be defined in paragraph 5.3. of this Regulation, then the requirements of paragraph 5.2.4. shall apply for calculating the limit applicable to HDDF Type 2A engines and HDDF Type 2B engines over that cycle.

              5.2.2.3.2. The emission limits (incl. the PM number limit) over the WHTC test-cycle applicable to HDDF Type 2B engines operating in diesel mode are those defined for CI engines in paragraph 5.3. of this Regulation.

              5.2.3. Hydrocarbon limits (in mg/kWh) applicable to HDDF Type 2A engines and to HDDF Type 2B engines operating in dual-fuel mode during the WHTC test cycle.

              The following calculation procedure applies for HDDF Type2A and HDDF Type 2B engines tested in the WHTC cycle while operating in dual-fuel mode:

               Calculate the average gas ratio GERWHTC over the hot part of the WHTC test cycle.

               Calculate a corresponding THCGER in mg/kWh using the following formula:

              THCGER = NMHCPI + (CH4PI * GERWHTC)

               Determine the applicable THC limit in mg/kWh using the following method:

               If  THCGER  ≤ CH4PI, then

              (a) THC limit value = THCGER;