Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:20:p12
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 20 (pt 12/29)
Character Range: 248129–250930

certification (WHDC), global technical regulation (gtr) No. 4).
2. Reserved[26]
3. Definitions, symbols and abbreviations
3.1. Definitions
 For the purpose of this Regulation,
              3.1.1. "Declared maximum power (Pmax)" means the maximum power in ECE kW (net power) as declared by the manufacturer in his application for approval.

3.1.2. "Delay time" means the difference in time between the change of the component to be measured at the reference point and a system response of 10 per cent of the final reading (t10) with the sampling probe being defined as the reference point. For the gaseous components, this is the transport time of the measured component from the sampling probe to the detector.
3.1.3. "Drift" means the difference between the zero or span responses of the measurement instrument after and before an emissions test.
3.1.4. "Full flow dilution method" means the process of mixing the total exhaust flow with diluent prior to separating a fraction of the diluted exhaust stream for analysis.
3.1.5. "High speed (nhi)" means the highest engine speed where 70 per cent of the declared maximum power occurs.
3.1.6. "Low speed (nlo)" means the lowest engine speed where 55 per cent of the declared maximum power occurs.
3.1.7. "Maximum power (Pmax)" means the maximum power in kW as specified by the manufacturer.
3.1.8. "Maximum torque speed" means the engine speed at which the maximum torque is obtained from the engine, as specified by the manufacturer.
3.1.9. "Normalized torque" means engine torque in per cent normalized to the maximum available torque at an engine speed.
3.1.10. "Operator demand" means an engine operator's input to control engine output. The operator may be a person (i.e., manual), or a governor
(i.e., automatic) that mechanically or electronically signals an input that demands engine output. Input may be from an accelerator pedal or signal, a throttle-control lever or signal, a fuel lever or signal, a speed lever or signal, or a governor setpoint or signal.
3.1.11. "Partial flow dilution method" means the process of separating a part from the total exhaust flow, then mixing it with an appropriate amount of diluent prior to the particulate sampling filter.
3.1.12. "Ramped steady state test cycle" means a test cycle with a sequence of steady state engine test modes with defined speed and torque criteria at each mode and defined ramps between these modes (WHSC).
3.1.13. "Rated speed" means the maximum full load speed allowed by the governor as specified by the manufacturer in his sales and service literature, or, if such a governor is not present, the speed at which the maximum power is obtained from the engine, as specified by the manufacturer in his sales and service literature.
3.1.14. "Response time" means the difference in