Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p94
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 94/150)
Character Range: 988128–990981

if it covers the full range from the highest to the lowest rating of the family. Alternatively, grouping of engine ratings into different WNTE control areas is permitted.
       Figure 2
       Example of WNTE control area
       Figure 3
       Example of WNTE cumulative speed frequency distribution

7.1.5. Compliance exclusion from certain WNTE operating points
 The manufacturer may request that the Type Approval Authority excludes operating points from the WNTE control area defined in paragraphs 7.1.1. through 7.1.4. during the certification/type approval. The Type Approval Authority may grant this exclusion if the manufacturer can demonstrate that the engine is never capable of operating at such points when used in any vehicle combination.
7.2. Minimum World-harmonized Not-To-Exceed event duration and data sampling frequency
7.2.1. To determine compliance with the WNTE emissions limits specified in paragraph 5.2., the engine shall be operated within the WNTE control area defined in paragraph 7.1. and its emissions shall be measured and integrated over a minimum period of 30 seconds. A WNTE event is defined as a single set of integrated emissions over the period of time. For example, if the engine operates for 65 consecutive seconds within the WNTE control area and ambient conditions this would constitute a single WNTE event and the emissions would be averaged over the full 65 second period. In the case of laboratory testing, the integrating period defined in paragraph 7.5. shall apply.
7.2.2. For engines equipped with emission controls that include periodic regeneration events, if a regeneration event occurs during the WNTE test, then the averaging period shall be at least as long as the time between the events multiplied by the number of full regeneration events within the sampling period. This requirement only applies for engines that send an electronic signal indicating the start of the regeneration event.
7.2.3. A WNTE event is a sequence of data collected at the frequency of at least 1 Hz during engine operation in the WNTE control area for the minimum event duration or longer. The measured emission data shall be averaged over the duration of each WNTE event.
7.3. In-use testing
A PEMS demonstration test shall be performed at type approval by testing the parent engine in a vehicle using the procedure described in Appendix 1 to this annex.
7.3.1. The manufacturer may select the vehicle that shall be used for testing but the vehicle choice shall be subject to the agreement of the Type Approval Authority. The characteristics of the vehicle used for the PEMS demonstration test shall be representative for the category of vehicle intended for the engine system. The vehicle may be a prototype vehicle.
7.3.2. At the request of the Type Approval Authority, an additional engine within the engine family