The definitions in this section apply to this part. The definitions apply to all subparts unless we note otherwise. Other terms have the meaning given in 40 CFR part 1065. The definitions follow:
Average means the arithmetic mean of a sample.
Bag 1 means relating to the first 505 seconds of the FTP cold-start test interval. Note that the term bag 1 may also apply to measurement of constituents that are not collected in a bag, such as PM and continuously measured THC.
Bag 2 means relating to the last 867 seconds of the FTP cold-start test interval.
Bag 3 means relating to the first 505 seconds of the FTP hot-start test interval.
Bag 4 means relating to the last 867 seconds of the FTP hot-start test interval, if run. Note that bag 2 is generally used in place of bag 4.
Base inertia means a value expressed in mass units to represent the rotational inertia of the rotating dynamometer components between the vehicle driving tires and the dynamometer torque-measuring device, as specified in § 1066.250.
C1-equivalent means a convention of expressing HC concentrations based on the total number of carbon atoms present, such that the C1-equivalent of an HC concentration equals the concentration multiplied by the mean number of carbon atoms in each HC molecule. For example, the C1-equivalent of 10 ppm of propane (C3H8) is 30 ppm. C1-equivalent concentration values may be denoted as “ppmC” in the standard-setting part. Densities may also be expressed on a C1 basis. Note that calculating HC masses from concentrations and densities is only valid where they are each expressed on the same carbon basis.
Charge-depleting means relating to the test interval of a plug-in hybrid engine or powertrain in which the engine or powertrain consumes electric energy from the RESS that has been charged from an external power source until the RESS is depleted to the point that a test interval qualifies as charge-sustaining. The engine might consume fuel to produce power during a charge-depleting test interval.
Charge-sustaining means relating to the test interval of a plug-in hybrid engine or powertrain in which the engine or powertrain consumes fuel to produce power such that the battery's net-energy change meets the end-of-test criterion of SAE J1711 or SAE J2711, as applicable (incorporated by reference in § 1066.1010).
Driving schedule means a series of vehicle speeds that a vehicle must follow during a test. Driving schedules are specified in the standard-setting part. A driving schedule may consist of multiple test intervals.
Duty cycle means a set of weighting factors and the corresponding test cycles, where the weighting factors are used to combine the results of multiple test intervals into a composite result.
FTP means one of the following:
(1) The test cycle consisting of one UDDS as specified in paragraph (a) of Appendix I of 40 CFR part 86, followed by a 10-minute soak with the engine off and repeat driving through the first 505 seconds of the UDDS. See § 1066.801(c)(1).
(2) The entire test procedure for measuring exhaust and/or evaporative emissions as described in § 1066.801(c).
Footprint has the meaning given in the standard-setting part.
HFET means the test cycle specified in Appendix I of 40 CFR part 600.
Hot LA-92 means the first 1435 seconds of the LA-92 driving schedule.
LA-92 means the test cycle specified in Appendix I, paragraph (c), of 40 CFR part 86.
Nonmethane organic gas (NMOG) means the combination of organic gases other than methane as calculated in § 1066.635. Note that for this part, the organic gases are summed on a mass basis without any adjustment for photochemical reactivity.
Parts-per-million (ppm) means ppm on a molar basis. For hydrocarbon concentrations including HC, THC, NMHC, and NMOG, ppm means ppm on a C1-equivalent molar basis.
Road-load coefficients means sets of A, B, and C road-load force coefficients that are used in the dynamometer road-load simulation, where road-load force at speed v equals A + B · v + C · v
2.
SC03 means the test cycle specified in Appendix I, paragraph (h), of 40 CFR part 86.
Standard reference conditions means the following:
(1) Standard pressure is 101.325 kPa.
(2) Standard temperature is 293.15 K.
Supplemental FTP (SFTP) means the collection of test cycles as given in § 1066.830.
Test interval means a period over which a vehicle's emission rates are determined separately. For many standards, compliance with the standard is based on a weighted average of the mass emissions from multiple test intervals. For example, the standard-setting part may specify a complete duty cycle as a cold-start test interval and a hot-start test interval. In cases where multiple test intervals occur over a duty cycle, the standard-setting part may specify additional calculations that weight and combine results to arrive at composite values for comparison against the applicable standards in this chapter.
Test weight has the meaning given in §§ 1066.410(b) or 1066.805.
UDDS means the test cycle specified in Appendix I, paragraph (a), of 40 CFR part 86.
US06 means the test cycle specified in Appendix I, paragraph (g), of 40 CFR part 86.
Unloaded coastdown means a dynamometer coastdown run with the vehicle wheels removed from the roll surface.
We (us, our) means the Administrator of the Environmental Protection Agency and any authorized representatives.
[79 FR 23823, Apr. 28, 2014, as amended at 80 FR 9124, Feb. 19, 2015; 88 FR 4710, Jan. 24, 2023; 89 FR 28215, Apr. 18, 2024]
The procedures in this part generally follow either the International System of Units (SI) or the United States customary units, as detailed in NIST Special Publication 811, which we incorporate by reference in § 1066.1010. See 40 CFR 1065.20 for specific provisions related to these conventions. This section summarizes the way we use symbols, units of measure, and other abbreviations.
(a) Symbols for quantities. This part uses the following symbols and units of measure for various quantities:
Table 1 of § 1066.1005—Symbols for Quantities
| Symbol
| Quantity
| Unit
| Unit symbol
| Unit in terms of SI base units
|
|---|
| α | atomic hydrogen to carbon ratio | mole per mole | mol/mol | 1.
|
| A | area | square meter | m2 | m2.
|
| A | vehicle frictional load | pound force or newton | lbf or N | m·kg·s−2.
|
| ag | acceleration of Earth's gravity | meters per second squared | m/s2 | m·s−2.
|
| Am | calculated vehicle frictional load | pound force or newton | lbf or N | m·kg·s−2.
|
| a0 | intercept of least squares regression.
| | | |
| a1 | slope of least squares regression.
| | | |
| a | acceleration | feet per second squared or meters per second squared | ft/s2 or m/s2 | m·s-2.
|
| B | vehicle load from drag and rolling resistance | pound force per mile per hour or newton second per meter | lbf/(mi/hr) or N·s/m | kg·s-1.
|
| β | ratio of diameters | meter per meter | m/m | 1.
|
| β | atomic oxygen to carbon ratio | mole per mole | mol/mol | 1.
|
| c | conversion factor.
| | | |
| C | vehicle-specific aerodynamic effects | pound force per mile per hour squared or newton-second squared per meter squared | lbf/(mi/hr)2 or N·s2/m2 | m-1·kg.
|
| C# | number of carbon atoms in a molecule | C# | number of carbon atoms in a molecule | C#.
|
| Cd | discharge coefficient.
| | | |
| CdA | drag area | meter squared | m2 | m2.
|
| Cf | flow coefficient.
| | | |
| Cp | heat capacity at constant pressure | joule per kelvin | J/K | m2·kg·s-2·K-1.
|
| Cv | heat capacity at constant volume | joule per kelvin | J/K | m2·kg·s-2·K-1.
|
| d | diameter | meters | m | m.
|
| D | distance | miles or meters | mi or m | m.
|
| D | slope correlation | pound force per mile per hour squared or newton second squared per meter squared | lbf/(mi/hr)2 or N·s2/m2 | m−2·kg.
|
| DF | dilution factor. | | | 1.
|
| e | mass weighted emission result | grams/mile | g/mi.
| |
| F | force | pound force or newton | lbf or N | kg·s−2.
|
| ƒ | frequency | hertz | Hz | s−1.
|
| ƒn | angular speed (shaft) | revolutions per minute | r/min | π·30·s−1.
|
| FC | friction compensation error | horsepower or watt | W | m2·kg·s−3.
|
| FR | road-load force | pound force or newton | lbf or N | kg·s−2.
|
| γ | ratio of specific heats | (joule per kilogram kelvin) per (joule per kilogram kelvin) | (J/(kg·K))/(J/(kg·K)) | 1.
|
| H | ambient humidity | grams water vapor per kilogram dry air | g H2O vapor/kg dry air | g H2O vapor/kg dry air.
|
| Δh | change in height | meters | m | m.
|
| I | inertia | pound mass or kilogram | lbm or kg | kg.
|
| I | current | ampere | A | A.
|
| i | indexing variable.
| | | |
| IR | inertia work rating.
| | | |
| K | correction factor | | | 1.
|
| Kv | calibration coefficient | | m4·s·K0.5/kg | m4·kg−1·s·K0.5.
|
| µ | viscosity, dynamic | pascal second | Pa·s | m−1·kg·s−1.
|
| M | molar mass | gram per mole | g/mol | 10-3·kg·mol−1.
|
| Me | effective mass | kilogram | kg | kg.
|
| m | mass | pound mass or kilogram | lbm or kg | kg.
|
| N | total number in series.
| | | |
| n | total number of pulses in a series.
| | | |
| p | pressure | pascal | Pa | m−1·kg·s−2.
|
| Δp | differential static pressure | pascal | Pa | m−1·kg·s−2.
|
| pd | saturated vapor pressure at ambient dry bulb temperature | kilopascal | kPa | m−1·kg·s−1.
|
| PF | penetration fraction.
| | | |
| ρ | mass density | kilogram per cubic meter | kg/m3 | m−3·kg.
|
| R | dynamometer roll revolutions | revolutions per minute | rpm | π·30−1·s−1.
|
| r | ratio of pressures | pascal per pascal | Pa/Pa | 1.
|
| r2 | coefficient of determination.
| | | |
| Re# | Reynolds number.
| | | |
| RF | response factor.
| | | |
| RH | relative humidity.
| | | |
| S | Sutherland constant | kelvin | K | K.
|
| SEE | standard error of the estimate.
| | | |
| SG | specific gravity.
| | | |
| Δs | distance traveled during measurement interval | meters | m | m.
|
| T | absolute temperature | kelvin | K | K.
|
| T | Celsius temperature | degree Celsius | °C | K−273.15.
|
| T | torque (moment of force) | newton meter | N·m | m2·kg·s-2.
|
| t | time | hour or second | hr or s | s.
|
| Δt | time interval, period, 1/frequency | second | s | s.
|
| U | voltage | volt | V | m2·kg·s-3·A-1.
|
| v | speed | miles per hour or meters per second | mi/hr or m/s | m·s-1.
|
| V | volume | cubic meter | m3 | m3.
|
| V
| flow volume rate | cubic feet per minute or cubic meter per second | ft3/min or m3/s | m3·/s−1.
|
| VP | volume percent.
| | | |
| x | concentration of emission over a test interval | part per million | ppm.
| |
| y | generic variable.
| | | |
| Z | compressibility factor. | | | |
(b) Symbols for chemical species. This part uses the following symbols for chemical species and exhaust constituents:
Table 2 to Paragraph (b) of § 1066.1005—Symbols for Chemical Species and Exhaust Constituents
| Symbol
| Species
|
|---|
| CH4 | methane.
|
| CH3OH | methanol.
|
| CH2O | formaldehyde.
|
| C2H4O | acetaldehyde.
|
| C2H5OH | ethanol.
|
| C2H6 | ethane.
|
| C3H7OH | propanol.
|
| C3H8 | propane.
|
| C4H10 | butane.
|
| C5H12 | pentane.
|
| CO | carbon monoxide.
|
| CO2 | carbon dioxide.
|
| H2O | water.
|
| HC | hydrocarbon.
|
| N2 | molecular nitrogen.
|
| NMHC | nonmethane hydrocarbon.
|
| NMHCE | nonmethane hydrocarbon equivalent.
|
| NMOG | nonmethane organic gas.
|
| NO | nitric oxide.
|
| NO2 | nitrogen dioxide.
|
| NOX | oxides of nitrogen.
|
| N2O | nitrous oxide.
|
| O2 | molecular oxygen.
|
| OHC | oxygenated hydrocarbon.
|
| PM | particulate matter.
|
| THC | total hydrocarbon.
|
| THCE | total hydrocarbon equivalent. |
(c) Superscripts. This part uses the following superscripts for modifying quantity symbols:
Table 3 of § 1066.1005—Superscripts
| Superscript
| Meaning
|
|---|
| overbar (such as y
) | arithmetic mean.
|
| overdot (such as y
) | quantity per unit time. |
(d) Subscripts. This part uses the following subscripts for modifying quantity symbols:
Table 4 of § 1066.1005—Subscripts
| Subscript
| Meaning
|
|---|
| 0 | reference.
|
| abs | absolute quantity.
|
| AC17 | air conditioning 2017 test interval.
|
| act | actual or measured condition.
|
| actint | actual or measured condition over the speed interval.
|
| adj | adjusted.
|
| air | air, dry.
|
| atmos | atmospheric.
|
| b | base.
|
| bkgnd | background.
|
| c | cold.
|
| comp | composite.
|
| cor | corrected.
|
| cs | cold stabilized.
|
| ct | cold transient.
|
| cUDDS | cold-start UDDS.
|
| D | driven.
|
| dew | dewpoint.
|
| dexh | dilute exhaust quantity.
|
| dil | dilute.
|
| e | effective.
|
| emission | emission specie.
|
| error | error.
|
| EtOH | ethanol.
|
| exh | raw exhaust quantity.
|
| exp | expected quantity.
|
| fil | filter.
|
| final | final.
|
| flow | flow measurement device type.
|
| gas | gaseous.
|
| h | hot.
|
| HFET | highway fuel economy test.
|
| hs | hot stabilized.
|
| ht | hot transient.
|
| hUDDS | hot-start UDDS.
|
| i | an individual of a series.
|
| ID | driven inertia.
|
| in | inlet.
|
| int | intake.
|
| init | initial quantity, typically before an emission test.
|
| IT | target inertia.
|
| liq | liquid.
|
| max | the maximum (i.e., peak) value expected at the standard over a test interval; not the maximum of an instrument range.
|
| meas | measured quantity.
|
| mix | dilute exhaust gas mixture.
|
| out | outlet.
|
| PM | particulate matter.
|
| record | record.
|
| ref | reference quantity.
|
| rev | revolution.
|
| roll | dynamometer roll.
|
| s | settling.
|
| s | slip.
|
| s | stabilized.
|
| sat | saturated condition.
|
| SC03 | air conditioning driving schedule.
|
| span | span quantity.
|
| sda | secondary dilution air.
|
| std | standard conditions.
|
| T | target.
|
| t | throat.
|
| test | test quantity.
|
| uncor | uncorrected quantity.
|
| w | weighted.
|
| zero | zero quantity. |
(d) Subscripts. This part uses the following subscripts to define a quantity:
| Subscript
| Quantity
|
|---|
| 0 | reference.
|
| abs | absolute quantity.
|
| AC17 | air conditioning 2017 test interval.
|
| act | actual or measured condition.
|
| actint | actual or measured condition over the speed interval.
|
| adj | adjusted.
|
| air | air, dry.
|
| atmos | atmospheric.
|
| b | base.
|
| bkgnd | background.
|
| c | cold.
|
| comp | composite.
|
| cor | corrected.
|
| cs | cold stabilized.
|
| ct | cold transient.
|
| cUDDS | cold-start UDDS.
|
| D | driven.
|
| dew | dewpoint.
|
| dexh | dilute exhaust quantity.
|
| dil | dilute.
|
| e | effective.
|
| emission | emission specie.
|
| error | error.
|
| EtOH | ethanol.
|
| exh | raw exhaust quantity.
|
| exp | expected quantity.
|
| fil | filter.
|
| final | final.
|
| flow | flow measurement device type.
|
| gas | gaseous.
|
| h | hot.
|
| HFET | highway fuel economy test.
|
| hs | hot stabilized.
|
| ht | hot transient.
|
| hUDDS | hot-start UDDS.
|
| i | an individual of a series.
|
| ID | driven inertia.
|
| in | inlet.
|
| int | intake.
|
| init | initial quantity, typically before an emission test.
|
| IT | target inertia.
|
| liq | liquid.
|
| max | the maximum (i.e. peak) value expected at the standard over a test interval; not the maximum of an instrument range.
|
| meas | measured quantity.
|
| mix | dilute exhaust gas mixture.
|
| out | outlet.
|
| PM | particulate matter.
|
| record | record.
|
| ref | reference quantity.
|
| rev | revolution.
|
| roll | dynamometer roll.
|
| s | settling.
|
| s | slip.
|
| s | stabilized.
|
| sat | saturated condition.
|
| SC03 | air conditioning driving schedule.
|
| span | span quantity.
|
| sda | secondary dilution air.
|
| std | standard conditions.
|
| T | target.
|
| t | throat.
|
| test | test quantity.
|
| uncor | uncorrected quantity.
|
| w | weighted.
|
| zero | zero quantity. |
(e) Other acronyms and abbreviations. This part uses the following additional abbreviations and acronyms:
Table 5 of § 1066.1005—Other Acronyms and Abbreviations
| Acronym
| Meaning
|
|---|
| A/C | air conditioning.
|
| AC17 | air conditioning 2017 test interval.
|
| ALVW | adjusted loaded vehicle weight.
|
| ASME | American Society of Mechanical Engineers.
|
| CFR | Code of Federal Regulations.
|
| CFV | critical-flow venturi.
|
| CNG | compressed natural gas.
|
| CVS | constant-volume sampler.
|
| EPA | Environmental Protection Agency.
|
| ETW | equivalent test weight.
|
| EV | electric vehicle.
|
| FID | flame-ionization detector.
|
| FTP | Federal test procedure.
|
| GC | gas chromatograph.
|
| GEM | greenhouse gas emissions model.
|
| GHG | greenhouse gas (including CO2, N2O, and CH4).
|
| GPS | global positioning system.
|
| GVWR | gross vehicle weight rating.
|
| HEV | hybrid electric vehicle, including plug-in hybrid electric vehicles.
|
| HFET | highway fuel economy test.
|
| HLDT | heavy light-duty truck.
|
| HPLC | high pressure liquid chromatography.
|
| IBR | incorporated by reference.
|
| LA-92 | Los Angeles 1992 driving schedule.
|
| MDPV | medium-duty passenger vehicle.
|
| NIST | National Institute for Standards and Technology.
|
| NMC | nonmethane cutter.
|
| PDP | positive-displacement pump.
|
| PHEV | plug-in hybrid electric vehicle.
|
| PM | particulate matter.
|
| RESS | rechargeable energy storage system.
|
| ppm | parts per million.
|
| SAE | Society of Automotive Engineers.
|
| SC03 | air conditioning driving schedule.
|
| SEA | selective enforcement audit.
|
| SFTP | Supplemental Federal Test Procedure.
|
| SI | International System of Units.
|
| SSV | subsonic venturi.
|
| UDDS | urban dynamometer driving schedule.
|
| US06 | aggressive driving schedule.
|
| U.S.C. | United States Code.
|
| WWV | NIST radio station call sign. |
(f) Densities of chemical species. This part uses the following densities of chemical species:
Table 6 of § 1066.1005—Densities of Chemical Species
| Symbol
| Quantity a b
| g/m3
| g/ft3
|
|---|
| ρCH4 | density of methane | 666.905 | 18.8847
|
| ρCH3OH | density of methanol | 1332.02 | 37.7185
|
| ρC2H5OH | C1-equivalent density of ethanol | 957.559 | 27.1151
|
| ρC2H4O | C1-equivalent density of acetaldehyde | 915.658 | 25.9285
|
| ρC3H8 | density of propane | 611.035 | 17.3026
|
| ρC3H7OH | C1-equivalent density of propanol | 832.74 | 23.5806
|
| ρCO | density of carbon monoxide | 1164.41 | 32.9725
|
| ρCO2 | density of carbon dioxide | 1829.53 | 51.8064
|
| ρHC-gas | effective density of hydrocarbon—gaseous fuel c | (see 3) | (see 3)
|
| ρCH2O | density of formaldehyde | 1248.21 | 35.3455
|
| ρHC-liq | effective density of hydrocarbon—liquid fueld | 576.816 | 16.3336
|
| ρNMHC-gas | effective density of nonmethane hydrocarbon—gaseous fuel c | (see 3) | (see 3)
|
| ρNMHC-liq | effective density of nonmethane hydrocarbon—liquid fuel d | 576.816 | 16.3336
|
| ρNMHCE-gas | effective density of nonmethane equivalent hydrocarbon—gaseous fuel c | (see 3) | (see 3)
|
| ρNMHCE-liq | effective density of nonmethane equivalent hydrocarbon—liquid fuel d | 576.816 | 16.3336
|
| ρNOx | effective density of oxides of nitrogen e | 1912.5 | 54.156
|
| ρN2O | density of nitrous oxide | 1829.66 | 51.8103
|
| ρTHC-liq | effective density of total hydrocarbon—liquid fuel d | 576.816 | 16.3336
|
| ρTHCE-liq | effective density of total equivalent hydrocarbon—liquid fuel d | 576.816 | 16.3336
|
(g) Constants. (1) This part uses the following constants for the composition of dry air:
Table 7 to Paragraph (g)(1) of § 1066.1005—Constants for the Composition of Dry Air
| Symbol
| Quantity
| mol/mol
|
|---|
| xArair | amount of argon in dry air | 0.00934
|
| xCO2air | amount of carbon dioxide in dry air | 0.000375
|
| xN2air | amount of nitrogen in dry air | 0.78084
|
| xO2air | amount of oxygen in dry air | 0.209445 |
(2) This part uses the following molar masses or effective molar masses of chemical species:
Table 8 to Paragraph (g)(2) of § 1066.1005—Molar Masses or Effective Molar Masses of Chemical Species
| Symbol
| Quantity
| g/mol
(10−
3·kg·mol−
1)
|
|---|
| Mair | molar mass of dry air
1 | 28.96559
|
| MH2O | molar mass of water | 18.01528
|
(3) This part uses the following molar gas constant for ideal gases:
Table 9 to Paragraph (g)(3) of § 1066.1005—Molar Gas Constant for Ideal Gases
| Symbol
| Quantity
| J/(mol·K)
(m
2·kg·s−
2·mol−
1·K−
1)
|
|---|
| R | molar gas constant | 8.314472 |
(h) Prefixes. This part uses the following prefixes to define a quantity:
Table 10 to Paragraph (h) of § 1066.1005—Prefixes to Define a Quantity
| Symbol
| Quantity
| Value
|
|---|
| n | nano | 10−
9
|
| µ | micro | 10−
6
|
| m | milli | 10−
3
|
| c | centi | 10−
2
|
| k | kilo | 10
3
|
| M | mega | 10
6 |
Certain material is incorporated by reference into this part with the approval of the Director of the Federal Register under 5 U.S.C. 552(a) and 1 CFR part 51. To enforce any edition other than that specified in this section, EPA must publish a document in the Federal Register and the material must be available to the public. All approved incorporation by reference (IBR) material is available for inspection at EPA and at the National Archives and Records Administration (NARA). Contact EPA at: U.S. EPA, Air and Radiation Docket Center, WJC West Building, Room 3334, 1301 Constitution Ave. NW, Washington, DC 20004; www.epa.gov/dockets; (202) 202-1744. For information on inspecting this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations.html or email [email protected]. The material may be obtained from the following sources:
(a) National Institute of Standards and Technology (NIST), 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070; (301) 975-6478; www.nist.gov.
(1) NIST Special Publication 811, 2008 Edition, Guide for the Use of the International System of Units (SI), Physics Laboratory, March 2008; IBR approved for §§ 1066.20(a); 1066.1005.
(2) [Reserved]
(b) SAE International, 400 Commonwealth Dr., Warrendale, PA 15096-0001; (877) 606-7323 (U.S. and Canada) or (724) 776-4970 (outside the U.S. and Canada); www.sae.org.
(1) SAE J1263 MAR2010, Road Load Measurement and Dynamometer Simulation Using Coastdown Techniques, Revised March 2010, (“SAE J1263”); IBR approved for §§ 1066.301(b); 1066.305(a); 1066.310(b).
(2) SAE J1634 JUL2017, Battery Electric Vehicle Energy Consumption and Range Test Procedure, Revised July 2017, (“SAE J1634”); IBR approved for § 1066.501(a).
(3) SAE J1711 FEB2023, Recommended Practice for Measuring the Exhaust Emissions and Fuel Economy of Hybrid-Electric Vehicles, Including Plug-In Hybrid Vehicles; Revised February 2023, (“SAE J1711”); IBR approved for §§ 1066.501(a); 1066.1001.
(4) SAE J2263 DEC2008, Road Load Measurement Using Onboard Anemometry and Coastdown Techniques, Revised December 2008; IBR approved for §§ 1066.301(b); 1066.305; 1066.310(b).
(5) SAE J2263 MAY2020, (R) Road Load Measurement Using Onboard Anemometry and Coastdown Techniques, Revised May 2020, (“SAE J2263”); IBR approved for §§ 1066.301(b); 1066.305; 1066.310(b).
(6) SAE J2264 JAN2014, Chassis Dynamometer Simulation of Road Load Using Coastdown Techniques, Revised January 2014, (“SAE J2264”); IBR approved for § 1066.315.
(7) SAE J2711 MAY2020, (R) Recommended Practice for Measuring Fuel Economy and Emissions of Hybrid-Electric and Conventional Heavy-Duty Vehicles, Revised May 2020, (“SAE J2711”); IBR approved for §§ 1066.501(a); 1066.1001.
(8) SAE J2951 JAN2014, Drive Quality Evaluation for Chassis Dynamometer Testing, Revised January 2014, (“SAE J2951”); IBR approved for § 1066.425(j).
(c) California Air Resources Board (California ARB). California Air Resources Board, 1001 I Street, Sacramento, CA 95812; (916) 322-2884; www.arb.ca.gov:
(1) California 2026 and Subsequent Model Year Criteria Pollutant Exhaust Emission Standards and Test Procedures for Passenger Cars, Light-Duty Trucks, And Medium-Duty Vehicles (“California ARB's LMDV Test Procedures”); Adopted August 25, 2022; IBR approved for § 1066.801(c).
(2) California Test Procedures for 2026 and Subsequent Model Year Zero-Emission Vehicles and Plug-In Hybrid Electric Vehicles, in the Passenger Car, Light-Duty Truck and Medium-Duty Vehicle Classes (“California ARB's PHEV Test Procedures”); Adopted August 25, 2022; IBR approved for § 1066.801(c).
[88 FR 4711, Jan. 24, 2023, as amended at 89 FR 28215, Apr. 18, 2024]