Document ID: chunk:federal_register_of_legislation:F2024L00446:front:0:p8
Version: federal_register_of_legislation:F2024L00446
Segment Type: other
Provision Reference: 
Character Range: 23709–27106

have a non-negligible influence on tailpipe emissions, such as, but not limited to, the following:

                     (i) Types and sequence of pollution control devices (e.g. three-way catalyst, oxidation catalyst, lean NOx trap, SCR, lean NOx catalyst, particulate trap or combinations thereof in a single unit);

                     (ii) Exhaust gas recirculation (with or without, internal/external, cooled/non-cooled, low/high/combined pressure).

              3.0.2. "Engine capacity" means:

              For reciprocating piston engines, the nominal engine swept volume.

              For rotary piston engines (Wankel), twice the nominal swept volume of a combustion chamber per piston.

              3.0.3. "Engine displacement" means:

              For reciprocating piston engines, the nominal engine swept volume.

              For rotary piston engines (Wankel), the nominal swept volume of a combustion chamber per piston.

              3.0.4. "Approval of a vehicle" means the approval of a vehicle type with regard to the scope of this Regulation.

              3.1. Test equipment

              3.1.1. "Accuracy" means the difference between a measured value and a reference value, traceable to a national standard and describes the correctness of a result. See Figure 1.

              3.1.2. "Calibration" means the process of setting a measurement system's response so that its output agrees with a range of reference signals.

              3.1.3. "Calibration gas" means a gas mixture used to calibrate gas analysers.

              3.1.4. "Double dilution method" means the process of separating a part of the diluted exhaust flow and mixing it with an appropriate amount of dilution air prior to the particulate sampling filter.

              3.1.5. "Full flow exhaust dilution system" means the continuous dilution of the total vehicle exhaust with ambient air in a controlled manner using a Constant Volume Sampler (CVS).

              3.1.6. "Linearization" means the application of a range of concentrations or materials to establish a mathematical relationship between concentration and system response.

              3.1.7. "Major maintenance" means the adjustment, repair or replacement of a component or module that could affect the accuracy of a measurement.

              3.1.8. "Non-Methane Hydrocarbons" (NMHC) are the Total Hydrocarbons (THC) minus the methane (CH4) contribution.

              3.1.9. "Precision" means the degree to which repeated measurements under unchanged conditions show the same results (Figure 1) and, in this Regulation, always refers to one standard deviation.

              3.1.10. "Reference value" means a value traceable to a national standard. See Figure 1.

              3.1.11. "Set point" means the target value a control system aims to reach.

              3.1.12. "Span" means to adjust an instrument so that it gives a proper response to a calibration standard that represents between 75 per cent and 100 per cent of the maximum value in the instrument range or expected range of use.

              3.1.13. "Total hydrocarbons" (THC) means all volatile compounds measurable by a flame ionization detector (FID).

              3.1.14. "Verification" means to evaluate whether or not a measurement system's outputs agrees with applied reference signals within one or more predetermined thresholds for