Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:20:p17
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 20 (pt 17/29)
Character Range: 265604–268801

ionization detector

FTIR         Fourier transform infrared analyser

GC           Gas chromatograph

HCLD         Heated chemiluminescent detector

HFID         Heated flame ionization detector

LDS          Laser diode spectrometer

LPG          Liquefied petroleum gas

NDIR         Non-dispersive infrared (analyzer)

NG           Natural gas

NMC          Non-methane cutter

OT           Outlet tube

PDP          Positive displacement pump

Per cent FS  Per cent of full scale

PCF          Particle pre-classifier

PFS          Partial flow system

PNC          Particle number counter

PND          Particle number diluter

PTS          Particle transfer system

PTT          Particle transfer tube

SSV          Subsonic venturi

VGT          Variable geometry turbine

VPR          Volatile particle remover

WHSC         World harmonised steady state cycle

WHTC         World harmonised transient cycle

4. General requirements
 The engine system shall be so designed, constructed and assembled as to enable the engine in normal use to comply with the provisions of this annex during its useful life, as defined in this Regulation, including when installed in the vehicle.
5. Performance requirements
5.1. Emission of gaseous and particulate pollutants
 The emissions of gaseous and particulate pollutants by the engine shall be determined on the WHTC and WHSC test cycles, as described in paragraph 7. The measurement systems shall meet the linearity requirements in paragraph 9.2. and the specifications in paragraph 9.3. (gaseous emissions measurement), paragraph 9.4. (particulate measurement) and in Appendix 2 to this annex.
 Other systems or analyzers may be approved by the Type Approval Authority, if it is found that they yield equivalent results in accordance with paragraph 5.1.1.
5.1.1. Equivalency
 The determination of system equivalency shall be based on a seven-sample pair (or larger) correlation study between the system under consideration and one of the systems of this annex.
 "Results" refer to the specific cycle weighted emissions value. The correlation testing is to be performed at the same laboratory, test cell, and on the same engine, and is preferred to be run concurrently. The equivalency of the sample pair averages shall be determined by F-test and t-test statistics as described in Appendix 3, paragraph A.3.3., obtained under the laboratory test
cell and the engine conditions described above. Outliers shall be determined in accordance with ISO 5725 and excluded from the database. The systems to be used for correlation testing shall be subject to the approval by the Type Approval Authority.
5.2. Engine family
5.2.1. General
 An engine family is characterized by design parameters. These shall be common to all engines within the family. The engine manufacturer may decide which engines belong to an engine family, as long as the membership criteria listed in paragraph 5.2.3. are respected. The engine family shall be approved by the Type Approval Authority. The manufacturer shall provide to the Type Approval Authority the appropriate information relating to the emission levels of the members of the engine family.
5.2.2. Special cases