Document ID: chunk:federal_register_of_legislation:F2023L00129:front:0:p14
Version: federal_register_of_legislation:F2023L00129
Segment Type: other
Provision Reference: 
Character Range: 38805–41991

accumulation period;

              2.2. "Approval of an engine (engine family)" means the approval of an engine type (engine family) with regard to the level of the emission of gaseous and particulate pollutants, smoke and the on-board diagnostic (OBD) system;

              2.3. "Approval of a vehicle" means the approval of vehicle type with regard to the level of the emission of gaseous and particulate pollutants and smoke by its engine as well as the on-board diagnostic (OBD) system and the engine installation on the vehicle;

              2.4. "Auxiliary Emission Strategy" (AES) means an emission strategy that becomes active and replaces or modifies a base emission strategy for a specific purpose and in response to a specific set of ambient and/or operating conditions and only remains operational as long as those conditions exist;

              2.5. "Base Emission Strategy" (BES) means an emission strategy that is active throughout the speed and load operating range of the engine unless an AES is activated;

              2.6. "Continuous regeneration" means the regeneration process of an exhaust after-treatment system that occurs either permanently or at least once per World Harmonised Transient Driving Cycle (WHTC) hot start test;

              2.7. "Crankcase" means the spaces in, or external to, an engine which are connected to the oil sump by internal or external ducts through which gases and vapours can be emitted;

              2.8. "Critical emission-related components" means the following components which are designed primarily for emission control: any exhaust after-treatment system, the ECU and its associated sensors and actuators, and the exhaust gas recirculation (EGR) system including all related filters, coolers, control valves and tubing;

              2.9. "Critical emission-related maintenance" means the maintenance to be performed on critical emission-related components;

              2.10. "Defeat strategy" means an emission strategy that does not meet the performance requirements for a base and/or auxiliary emission strategy as specified in this annex;

              2.11. "deNOx system" means an exhaust after-treatment system designed to reduce emissions of oxides of nitrogen (NOx) (e.g. passive and active lean NOx catalysts, NOx adsorbers and selective catalytic reduction (SCR) systems);

              2.12. "Diagnostic trouble code" (DTC) means a numeric or alphanumeric identifier which identifies or labels a malfunction;

              2.13. "Diesel mode" means the normal operating mode of a dual-fuel engine during which the engine does not use any gaseous fuel for any engine operating condition;"

              2.14. "Driving cycle" means a sequence consisting of an engine start, an operating period (of the vehicle), an engine shut-off, and the time until the next engine start;

              2.15. "Dual-fuel engine" means an engine system that is designed to simultaneously operate with diesel fuel and a gaseous fuel, both fuels being metered separately, where the consumed amount of one of the fuels relative to the other one may vary depending on the operation;

              2.16. "Dual-fuel