86.1777-99—Calculations; exhaust emissions.
The provisions of § 86.144 apply to this subpart, with the following exceptions and additions:
Code of Federal Regulations
(b)
The requirements in Chapter 5 of the California Regulatory Requirements Applicable to the National Low Emission Vehicle Program (October, 1996) apply to this subpart. These requirements are incorporated by reference (see § 86.1 ).
(d) Reactivity adjustment factors.
(1)
For the purpose of complying with the NMOG exhaust emission standards in §§ 86.1708 and 86.1709, the mass of NMOG emissions from a vehicle certified to operate on a fuel other than conventional gasoline, including fuel-flexible and dual-fuel vehicles when operated on a fuel other than conventional gasoline, shall be multiplied by the reactivity adjustment factor applicable to the vehicle emission control technology category and fuel. The product of the NMOG mass emission value and the reactivity adjustment factor shall be compared to the NMOG exhaust emission standards to determine compliance with the standards. In addition to the above requirements, vehicles operating on natural gas shall add to the product of the NMOG mass emission value and the reactivity adjustment factor, the product of the methane mass emission value and the methane reactivity adjustment factor. This result shall be compared to the NMOG exhaust emission standards to determine compliance with the standards for natural gas-fueled vehicles.
(2)
The following reactivity adjustment factors have been established pursuant to the criteria in appendix XVII of this part:
| Vehicle emission control technology category | Fuel | Reactivity adjustment factor |
|---|---|---|
| TLEVs | 85% methanol, 15% gasoline blends | 0.41 |
| LEVs and ULEVs through model year 2000 | 85% methanol, 15% gasoline blends | 0.41 |
| TLEVs through model year 2000 | Gasoline meeting the specifications of § 86.1771(a)(1) | 0.98 |
| LEVs and ULEVs through model year 2000 | Gasoline meeting the specifications of § 86.1771(a)(1) | 0.94 |
| TLEVs through model year 2000 | Fuel meeting the specifications for liquefied petroleum gas specified in Chapter 4 of the California Regulatory Requirements Applicable to the National Low Emission Vehicle Program (October, 1996) | 1.00 |
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| LEVs and ULEVs through model year 2000 | Fuel meeting the specifications for liquefied petroleum gas specified in Chapter 4 of the California Regulatory Requirements Applicable to the National Low Emission Vehicle Program (October, 1996) | 0.50 |
| TLEVs through model year 2000 | Fuel meeting the specifications for natural gas specified in Chapter 4 of the California Regulatory Requirements Applicable to the National Low Emission Vehicle Program (October, 1996) | 1.00 |
| LEVs and ULEVs through model year 2000 | Fuel meeting the specifications for natural gas specified in Chapter 4 of the California Regulatory Requirements Applicable to the National Low Emission Vehicle Program (October, 1996) | 0.43 |
| Vehicle emission control technology category | Methane reactivity adjustment factor |
|---|---|
| TLEVs | 0.0043 |
| LEVs and ULEVs | 0.0047 |
(3)
The Administrator may establish new reactivity adjustment factors pursuant to appendix XVII of this part in addition to those listed in paragraph (d)(2) of this section. The Administrator shall notify manufacturers in writing of the new reactivity adjustment factors within 30 days of their establishment.
(4)
The Administrator may revise any reactivity adjustment factor listed in paragraph (d)(2) of this section or established by the Administrator pursuant to appendix XVII of this part if he or she determines that the revised reactivity adjustment factor is more representative of the ozone-forming potential of vehicle NMOG emissions based on the best available scientific knowledge and sound engineering judgment. The Administrator shall notify manufacturers in writing of any such reactivity adjustment factor at least 3 years prior to January 1 of the calendar year which has the same numerical designation as the model year for which the revised reactivity adjustment factor first becomes effective. However, manufacturers may use the revised reactivity adjustment factor in certifying any new engine family whose certification application is submitted following such notification, if they so choose. Manufacturers may also continue to use the original reactivity adjustment factor for any existing engine family previously certified with that reactivity adjustment factor until a new durability-data vehicle is tested for that engine family.
(5)
Manufacturers may request the use of a unique reactivity adjustment factor for a specific vehicle emission control technology category and fuel. The Administrator shall approve such requests in accordance with the conditions and procedures of appendix XVII of this part. For the purpose of calculating the reactivity adjustment factor as specified in appendix XVII of this part, the “g ozone potential per g NMOG” value for the vehicle emission control technology category and fuel system for which the manufacturer is requesting the use of a unique reactivity adjustment factor shall be divided by the “g ozone potential per g NMOG” value for a conventional gasoline-fueled vehicle established for the vehicle emission control technology category. The following “g ozone potential per g NMOG” values for conventional gasoline-fueled vehicle emission control technology categories have been established:
| Vehicle emission control technology category | “g ozone potential per g NMOG” for conventional gasoline |
|---|---|
| All TLEVs | 3.42 |
| All 1993 and subsequent model-year LEVs and ULEVs | 3.13 |