Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:9:p20
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 9 (pt 20/37)
Character Range: 1834146–1837409

of this annex. The equivalence of the candidate method shall be demonstrated to the responsible authority.

              1.1. Decision on equivalency

              A candidate method shall be considered equivalent if the accuracy and precision is equal to or better than the reference method.

              1.2. Determination of equivalency

              The determination of method equivalency shall be based on a correlation study between the candidate and the reference methods. The methods to be used for correlation testing shall be subject to approval by the responsible authority.

              The basic principle for the determination of accuracy and precision of candidate and reference methods shall follow the guidelines in ISO 5725 Part 6 Annex 8 "Comparison of alternative Measurement Methods".

              1.3. Implementation requirements (RESERVED)

Annexes Part C
Annex C1: (Reserved)
Annex C2: (Reserved)
Annex C3: Type 4 test

Determination of evaporative emissions from vehicles with engines fuelled with petrol
  Type 4 test procedures and test conditions
              1. Introduction
               This annex provides the method to determine the levels of evaporative emission from light-duty vehicles in a repeatable and reproducible manner designed to be representative of real world vehicle operation.
              2. Technical requirements
              2.1. The procedure includes the evaporative emissions test and two additional tests, one for the ageing of carbon canisters, as described in paragraph 5.1. of this annex, and one for the permeability of the fuel tank system, as described in paragraph 5.2. of this annex. The evaporative emissions test (Figure C3/4) determines hydrocarbon evaporative emissions as a consequence of diurnal temperature fluctuations and hot soaks during parking.
              2.2. In the case that the fuel system contains more than one carbon canister, all references to the term "carbon canister" in this annex will apply to each carbon canister.
              3. Vehicle
               The vehicle shall be in good mechanical condition and have been run-in and driven at least 3,000 km before the test. For the purpose of the determination of evaporative emissions, the mileage and the age of the vehicle used for certification shall be recorded. The evaporative emission control system shall be connected and functioning correctly during the run-in period. The aged carbon canister shall not be installed during the run-in period.
              A carbon canister aged according to the procedure described in paragraphs 5.1. to 5.1.3.1.3. inclusive of this annex shall not be installed until the start of the fuel drain and refill procedure specified in paragraph 6.5.1. of this annex.

              4. Test equipment, calibration requirements and intervals

              Unless stated otherwise in this paragraph, equipment used for testing shall be calibrated before its initial use and at appropriate service intervals thereafter. An appropriate service interval shall be either equipment manufacturer recommendation or according to good engineering practice.

              4.1. Chassis dynamometer

               The chassis dynamometer shall meet the requirements of paragraphs