Manufacturers may generate credits applicable to the CO2 fleet average program described in § 86.1865-12 by implementing specific air conditioning system technologies designed to reduce air conditioning-related CO2 emissions over the useful life of their passenger automobiles and light trucks (including MDPV). The provisions of this section do not apply for medium-duty vehicles. Credits shall be calculated according to this section for each air conditioning system that the manufacturer is using to generate CO2 credits. Manufacturers must validate credits under this section based on testing as described in paragraph (g) of this section. Starting in model year 2027, manufacturers may generate credits under this section only for vehicles propelled by internal combustion engines.
Table 1 to Paragraph (a) -Technology-Specific Air Conditioning Efficiency Credits
[g/mile]
Air conditioning technology | Passenger automobiles | Light trucks |
Reduced reheat, with externally controlled, variable-displacement compressor (e.g., a compressor that controls displacement based on temperature setpoint and/or cooling demand of the air conditioning system control settings inside the passenger compartment) | 1.5 | 2.2 |
Reduced reheat, with externally controlled, fixed-displacement or pneumatic variable displacement compressor (e.g., a compressor that controls displacement based on conditions within, or internal to, the air conditioning system, such as head pressure, suction pressure, or evaporator outlet temperature) | 1.0 | 1.4 |
Default to recirculated air with closed-loop control of the air supply (sensor feedback to control interior air quality) whenever the ambient temperature is 75 °F or higher: Air conditioning systems that operated with closed-loop control of the air supply at different temperatures may receive credits by submitting an engineering analysis to the Administrator for approval | 1.5 | 2.2 |
Default to recirculated air with open-loop control air supply (no sensor feedback) whenever the ambient temperature is 75 °F or higher. Air conditioning systems that operate with open-loop control of the air supply at different temperatures may receive credits by submitting an engineering analysis to the Administrator for approval | 1.0 | 1.4 |
Blower motor controls which limit wasted electrical energy (e.g., pulse width modulated power controller) | 0.8 | 1.1 |
Internal heat exchanger (e.g., a device that transfers heat from the high-pressure, liquid-phase refrigerant entering the evaporator to the low-pressure, gas-phase refrigerant exiting the evaporator) | 1.0 | 1.4 |
Improved condensers and/or evaporators with system analysis on the component(s) indicating a coefficient of performance improvement for the system of greater than 10% when compared to previous industry standard designs) | 1.0 | 1.4 |
Oil separator. The manufacturer must submit an engineering analysis demonstrating the increased improvement of the system relative to the baseline design, where the baseline component for comparison is the version which a manufacturer most recently had in production on the same vehicle design or in a similar or related vehicle model. The characteristics of the baseline component shall be compared to the new component to demonstrate the improvement | 0.5 | 0.7 |
Advanced technology air conditioning compressor with improved efficiency relative to fixed-displacement compressors achieved through the addition of a variable crankcase suction valve | 1.1 | 1.1 |
EQUATION 1 TO PARAGRAPH (C)
Where:
Credit = the CO2 efficiency credit value in grams per mile determined in paragraph (b) of this section, whichever is applicable. Starting in model year 2027, multiply the credit value for PHEV by (1-UF), where UF = the fleet utility factor established under 40 CFR 600.116-12(c)(1) or (c)(10)(iii) (weighted 55 percent city, 45 percent highway.
Production = The total number of passenger automobiles or light trucks, whichever is applicable, produced with the air conditioning system to which to the efficiency credit value from paragraph (b) of this section applies.
VLM = vehicle lifetime miles, which for passenger automobiles shall be 195,264 and for light trucks shall be 225,865.
40 C.F.R. §§86.1868-12