Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p56
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 56/59)
Character Range: 762098–765259

hours of engine operation.

              6.5.8.            Demonstration of the emission control monitoring system

              6.5.8.1.        As part of the application for type-approval provided for in section 3, the manufacturer shall demonstrate the conformity of the provisions of this section by tests on an engine dynamometer in accordance with sections 6.5.8.2 to 6.5.8.7.

              6.5.8.2.        The compliance of an engine family or an OBD engine family to the requirements of this section may be demonstrated by testing the emission control monitoring system of one of the members of the family (the parent engine), provided the manufacturer demonstrates to the type approval authority that the emission control monitoring systems are similar within the family.

              This demonstration may be performed by presenting to the type-approval authorities such elements as algorithms, functional analyses, etc.

              The parent engine is selected by the manufacturer in agreement with the type approval authority.

              6.5.8.3.        The testing of the emission control monitoring system consists of the following three phases:
              Selection :

              An incorrect operation of the NOx control measures or a failure of the emission control monitoring system is selected by the authority within a list of incorrect operations provided by the manufacturer.

              Qualification:

              The influence of the incorrect operation is validated by measuring the NOx level over the ETC on an engine test bed.

              Demonstration:

              The reaction of the system (torque reduction, warning signal, etc.) shall be demonstrated by running the engine on four OBD test cycles.

              6.5.8.3.1.    For the selection phase, the manufacturer shall provide the type approval authority with a description of the monitoring strategies used to determine potential incorrect operation of any NOx control measure and potential failures in the emission control monitoring system that would lead either to activation of the torque limiter or to activation of the warning signal only.

              Typical examples of incorrect operations for this list are an empty reagent tank, an incorrect operation leading to an interruption of reagent dosing activity, an insufficient reagent quality, an incorrect operation leading to low reagent consumption, an incorrect EGR flow or a deactivation of the EGR.

              A minimum of two and a maximum of three incorrect operations of the NOx control system or failures of the emission control monitoring system shall be selected by the type approval authority from this list.

              6.5.8.3.2.    For the qualification phase, the NOx emissions shall be measured over the ETC test cycle, according to the provisions of Appendix 2 to Annex III. The result of the ETC test shall be used to determine in which way the NOx control monitoring system is expected to react during the demonstration process (torque reduction and/or warning signal). The failure shall be simulated in a way that the NOx level does not exceed by more