Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p31
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 31/150)
Character Range: 800704–804151

of Table 1 for compression ignition engines and of Table 2 for gas fuelled engines and positive ignition engines.

       Table 1
       OTLs (Compression ignition engines)
                      Limit in mg/kWh
                      NOx               PM Mass
Phase-in period       1,500             25
General requirements  1,200             25

       Table 2
       OTLs (positive ignition engines)
                                                  Limit in mg/kWh

                                                  NOx                             CO1
              Phase-in period                     1 500                           7 500
              General requirements                1 200                           7 500

           1 The transitional provisions related to introduction of the CO OTLs are specified in paragraphs 13.2.2. and 13.3.2. of this Regulation.

4. Demonstration requirements
              4.1. The demonstration requirements and test procedures shall be those set out in paragraphs 6. and 7. of Annex 9B.

5. Documentation requirements
              5.1. The documentation requirements shall be those set out in paragraph 8. of Annex 9B.

6. In-use performance requirements
              The requirements of this paragraph shall apply to the OBD system monitors in accordance with the provisions of Annex 9C.

              6.1. Technical requirements

              6.1.1. The technical requirements for assessing the in-use performance of OBD systems including requirements concerning communication protocols, numerators, denominators and their increment shall be those set out in Annex 9C.

              6.1.2. In particular, the in-use performance ratio (IUPRm) of a specific monitor m of the OBD system shall be calculated by the following formula:

              IUPRm = Numeratorm / Denominatorm

              Where:

              "Numeratorm" means the numerator of a specific monitor m and is a counter indicating the number of times a vehicle has been operated in such a way that all monitoring conditions necessary for that specific monitor to detect a malfunction have been encountered;

              and

              "Denominatorm" means the denominator of a specific monitor m and is a counter indicating the number of vehicle driving cycles that are of relevance to that specific monitor (or, "in which events occur that are of relevance to that specific monitor. ").

              6.1.3. The in-use performance ratio (IUPRg) of a group g of monitors on board a vehicle is calculated by the following formula:

              IUPRg = Numeratorg / Denominatorg

              Where:

              "Numeratorg" means the numerator of a group g of monitors and is the actual value (Numeratorm) of the specific monitor m that has the lowest in-use performance ratio as defined in paragraph 6.1.2. of all monitors within that group g of monitors on board a particular vehicle;

              and

              "Denominatorg" means the denominator of a group g of monitors and is the actual value (Denominatorm) of the specific monitor m that has the lowest in-use performance ratio as defined in paragraph 6.1.2. of all monitors within that group g of monitors on board a particular vehicle.

              6.2. Minimum in-use performance ratio

              6.2.1. The in-use performance ratio IUPRm of a monitor m of the OBD system as defined in paragraph 5. of Annex 9C, shall be greater