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Division 6.6.2 Infrequent regeneration

United Kingdom

Original text. Later amendments are not shown.

This provision only applies to engines equipped with an exhaust after-treatment system that is regenerated on an infrequent basis, typically occurring in less than 100 hours of normal engine operation. For those engines, either additive or multiplicative factors shall be determined for upward and downward adjustment as referred to in point 6.6.2.4 (‘adjustment factor’).

Testing and development of adjustment factors is only required for one applicable transient (NRTC or LSI-NRTC) test cycle or RMC. The factors that have been developed may be applied to results from the other applicable test cycles including discrete-mode NRSC.

In case that no suitable adjustment factors are available from testing using transient (NRTC or LSI-NRTC) test cycle or RMC then adjustment factors shall be established using an applicable discrete-mode NRSC test. Factors developed using a discrete-mode NRSC test shall only be applied to discrete-mode NRSC.

It shall not be required to conduct testing and develop adjustment factors on both RMC and discrete-mode NRSC.

  1. 6.6.2.1Requirement for establishing adjustment factors using NRTC, LSI-NRTC or RMC
  2. 6.6.2.2Requirement for establishing adjustment factors using discrete-mode NRSC testing
  3. 6.6.2.3General procedure for developing infrequent regeneration adjustment factors (IRAFs)
  4. 6.6.2.4Application of adjustment factors