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Federal Register / Vol. 86, No. 248 / Thursday, December 30, 2021 / Rules and Regulations
quickly warm the transmission fluid to an operating temperature range using a heat exchanger, increasing the overall transmission efficiency by reducing parasitic losses associated with the transmission fluid, such as losses related to friction and fluid viscosity.
B Starting in model year 2023, active transmission warm-up means a system that uses waste heat from the vehicles exhaust to warm the transmission fluid to an operating temperature range using a dedicated heat exchanger. Active transmission warm-up may also include coolant systems that capture heat from a liquid-cooled exhaust manifold if the coolant loop to the transmission heat exchanger is not shared with other heatextracting systems and it starts heat transfer to the transmission fluid immediately after engine starting, consistent with designs that exchange heat directly from exhaust gases to the transmission fluid.
vi Active engine warm-up means one of the following:
A Through model year 2022, active engine warm-up means a system that uses waste heat from the vehicle to warm up targeted parts of the engine so it reduces engine friction losses and enables closed-loop fuel control to start sooner.
B Starting in model year 2023, active engine warm-up means a system that uses waste heat from the vehicles exhaust to warm up targeted parts of the engine so it reduces engine friction losses and enables closed-loop fuel control to start sooner. Active engine warm-up may also include coolant systems that capture heat from a liquidcooled exhaust manifold.

x Passive cabin ventilation means one of the following:
A Through model year 2022, passive cabin ventilation means ducts, devices, or methods that utilize convective airflow to move heated air from the cabin interior to the exterior of the vehicle.
B Starting in model year 2023, passive cabin ventilation means methods that create and maintain convective airflow through the bodys cabin by keeping windows or sunroof open to prevent excessive interior temperatures when the vehicle is parked outside in direct sunlight.

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A A citation to the appropriate previously approved methodology, including the appropriate Federal Register Notice and any subsequent EPA documentation of the Administrators decision;

9. Amend 86.187012 by revising the section heading and paragraphs a2 and b2 to read as follows:
86.187012 CO2 credits for qualifying full-size pickup trucks.

a
2 Full-size pickup trucks that are strong hybrid electric vehicles and that are produced in 2017 through 2021
model years are eligible for a credit of 20 grams/mile. This same credit is available again for those vehicles produced in 2023 and 2024 model years. To receive this credit in a model year, the manufacturer must produce a quantity of strong hybrid electric fullsize pickup trucks such that the proportion of production of such vehicles, when compared to the manufacturers total production of fullsize pickup trucks, is not less than 10
percent in that model year. Full-size pickup trucks earning credits under this paragraph a2 may not earn credits based on the production multipliers described in 86.186612b.

b
2 Full-size pickup trucks that are produced in 2017 through 2021 model years and that achieve carbon-related exhaust emissions less than or equal to the applicable target value determined in 86.181812c3 multiplied by 0.80
rounded to the nearest gram/mile in a model year are eligible for a credit of 20
grams/mile. This same credit is available again for qualifying vehicles produced in 2023 and 2024 model years. A pickup truck that qualifies for this credit in a model year may claim this credit for a maximum of four subsequent model years a total of five consecutive model years if the carbonrelated exhaust emissions of that pickup truck do not increase relative to the emissions in the model year in which the pickup truck first qualified for the credit. This credit may not be claimed
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in model year 2022 or in any model year after 2024. To qualify for this credit in a model year, the manufacturer must produce a quantity of full-size pickup trucks that meet the emission requirements of this paragraph b2
such that the proportion of production of such vehicles, when compared to the manufacturers total production of fullsize pickup trucks, is not less than 10
percent in that model year. A pickup truck that qualifies for this credit in a model year and is subject to a major redesign in a subsequent model year such that it qualifies for the credit in the model year of the redesign may be allowed to qualify for an additional five years with EPA approval not to go beyond the 2024 model year. Use good engineering judgment to determine whether a pickup truck has been subject to a major redesign.

PART 600FUEL ECONOMY AND
GREENHOUSE GAS EXHAUST
EMISSIONS OF MOTOR VEHICLES
10. The authority citation for part 600
continues to read as follows:

Authority: 49 U.S.C. 3290123919q, Pub.
L. 10958.

11. Amend 600.51012 by revising paragraphs j2v introductory text and j2viiA introductory text to read as follows:

600.51012 Calculation of average fuel economy and average carbon-related exhaust emissions.

j
2
v For natural gas dual fuel model types, for model years 2012 through 2015, the arithmetic average of the following two terms; the result rounded to the nearest gram per mile:

viiA This paragraph j2vii applies to model year 2016 and later natural gas dual fuel model types.
Model year 2021 and later natural gas dual fuel model types may use a utility factor of 0.5 or the utility factor prescribed in this paragraph j2vii.

FR Doc. 202127854 Filed 122921; 8:45 am BILLING CODE 656050P

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