Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p72
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 72/150)
Character Range: 913268–916502

time interval, or: when feedback control has used up all the adjustment capability allowed by the manufacturer and the system cannot achieve the target) - component monitoring.

       In particular, in the case where the control of reagent injection is performed by means of a closed loop system, the monitoring requirements set out in this item shall apply, but the failures detected shall not be classified as Class C failures.
       Note: These provisions apply to all electric-electronic components, even if they belong to any of the monitors described in the other items of this appendix.
       Appendix 3 - Item 2
       DPF system
       The OBD system shall monitor the following elements of the DPF system on engines so-equipped for proper operation:
           (a) DPF substrate: the presence of the DPF substrate - total functional failure monitoring;
           (b) DPF performance: clogging of the DPF - total functional failure;
           (c1) DPF filtering performance: the filtering and regeneration process of the DPF. This requirement would apply to PM emissions only - emission threshold monitoring.
            Alternatively, as appropriate[42], the OBD system shall monitor:
           (c2) DPF performance: filtering and regeneration processes (e.g. particulate accumulation during the filtering process and particulate removal during a forced regeneration process) – performance monitoring according to Appendix 8 to this annex.
       Note: The periodic regeneration shall be monitored against the ability of the device to perform as designed (for example to perform regeneration within a manufacturer-specified time interval, to perform regeneration upon demand, etc). This will constitute one element of the component monitoring associated with the device.
       Appendix 3 - Item 3
       Selective Catalytic Reduction (SCR) monitoring
       For the purpose of this item, SCR means selective catalytic reduction or other lean NOx catalyst device. The OBD system shall monitor the following elements of the SCR system on engines so-equipped for proper operation:
           (a) Active/intrusive reagent injection system: the system's ability to regulate reagent delivery properly, whether delivered via an in-exhaust injection or an in-cylinder injection - performance monitoring;
           (b) Active/intrusive reagent: the on-board availability of the reagent, the proper consumption of the reagent if a reagent other than fuel is used (e.g. urea) - performance monitoring;
           (c) Active/intrusive reagent: the proper consumption of the reagent if a reagent other than fuel is used (e.g. urea) - performance monitoring;
           (d) SCR catalyst conversion efficiency: the catalyst's SCR ability to convert NOx emission threshold monitoring.
       Appendix 3 - Item 4
       Lean-NOx Trap /LNT, or NOx adsorber);
       The OBD system shall monitor the following elements of the LNT system on engines so-equipped for proper operation:
           (a) LNT capability: the LNT system's ability to adsorb/store and convert NOx - performance monitoring;
           (b) LNT active/intrusive reagent injection system: the system's ability to regulate reagent delivery properly, whether delivered