View all text of Subpart A [§ 86.000-2 - § 86.099-11]
§ 86.007-15 - NOX and particulate averaging, trading, and banking for heavy-duty engines.
Section 86.007-15 includes text that specifies requirements that differ from § 86.004-15. Where a paragraph in § 86.004-15 is identical and applicable to § 86.007-15, this may be indicated by specifying the corresponding paragraph and the statement “[Reserved]. For guidance see § 86.004-15.”
(a)-(l) [Reserved]. For guidance see § 86.004-15.
(m) The following provisions apply for model year 2007 and later engines (including engines certified during years 2007-2009 under the phase-in provisions of § 86.007-11(g)(1), § 86.005-10(a), or § 86.008-10(f)(1)). These provisions apply instead of the provisions of paragraphs § 86.004-15 (a) through (k) to the extent that they are in conflict.
(1) Manufacturers of Otto-cycle engines may participate in an NMHC averaging, banking and trading program to show compliance with the standards specified in § 86.008-10. The generation and use of NMHC credits are subject to the same provisions in paragraphs § 86.004-15 (a) through (k) that apply for NO
(2) Credits are calculated as NO
(3) NO
(4) Credits that were previously discounted when they were banked according to paragraph (c) of § 86.004-15, are subject to an additional discount factor of 0.888 instead of the 0.8 discount factor otherwise required by paragraph (m)(2) or (m)(3) of this section. This results in a total discount factor of 0.8 (0.9 × 0.888 = 0.8).
(5) For diesel engine families, the combined number of engines certified to FELs higher than 0.50 g/bhp-hr using banked NO
(6) The FEL must be expressed to the same number of decimal places as the standard (generally, one-hundredth of a gram per brake horsepower-hour). For engines certified to standards expressed only one-tenth of a gram per brake horsepower-hour, if the FEL is below 1.0, then add a zero to the standard in the second decimal place and express the FEL to nearest one-hundredth of a gram per brake horsepower-hour.
(7) Credits are to be rounded to the nearest one-hundredth of a Megagram using ASTM E29-93a (Incorporated by reference at § 86.1).
(8) Credits generated for 2007 and later model year diesel engine families, or generated for 2008 and later model year Otto-cycle engine families are not discounted (except as specified in paragraph (m)(2) or (m)(3) of this section), and do not expire.
(9) For the purpose of using or generating credits during a phase-in of new standards, a manufacturer may elect to split an engine family into two subfamilies (e.g., one which uses credits and one which generates credits). The manufacturer must indicate in the application for certification that the engine family is to be split, and may assign the numbers and configurations of engines within the respective subfamilies at any time prior to the submission of the end-of-year report required by § 86.001-23.
(i) Manufacturers certifying a split diesel engine family to both the Phase 1 and Phase 2 standards with equally sized subfamilies may exclude the engines within that split family from end-of-year NO
(ii) Manufacturers certifying a split Otto-cycle engine family to both the Phase 1 and Phase 2 standards with equally sized subfamilies may exclude the engines within that split family from end-of-year NO
(iii) Manufacturers certifying a split engine family may label all of the engines within that family with a single NO
(iv) Notwithstanding the provisions of paragraph (m)(9)(iii) of this section, for split families, the NO
(10) For model years 2007 through 2009, to be consistent with the phase-in provisions of § 86.007-11(g)(1), credits generated from engines in one diesel engine service class (e.g., light-heavy duty diesel engines) may be used for averaging by engines in a different diesel engine service class, provided the credits are calculated for both engine families using the conversion factor and useful life of the engine family using the credits, and the engine family using the credits is certified to the standards listed in § 86.007-11(a)(1). Banked or traded credits may not be used by any engine family in a different service class than the service class of the engine family generating the credits.