View all text of Subpart F [§ 1037.501 - § 1037.570]
§ 1037.515 - Determining CO2 emissions to show compliance for trailers.
This section describes a compliance approach for trailers that is consistent with the modeling for vocational vehicles and tractors described in § 1037.520, but is simplified consistent with the smaller number of trailer parameters that affect CO
(a) Compliance equation. Calculate CO
(1) Use the following equation:
Where:Table 1 of § 1037.515—Regression Coefficients for Calculating CO
Trailer category | Long dry box van | 76.1 | 1.67 | −5.82 | −0.00103 | Long refrigerated box van | 77.4 | 1.75 | −5.78 | −0.00103 | Short dry box van | 117.8 | 1.78 | −9.48 | −0.00258 | Short refrigerated box van | 121.1 | 1.88 | −9.36 | −0.00264 |
---|
(2) The following is an example for calculating the mass of CO
(b) Tire rolling resistance. Use the procedure specified in § 1037.520(c) to determine the tire rolling resistance level for your tires. Note that you may base tire rolling resistance levels on measurements performed by tire manufacturers, as long as those measurements meet this part's specifications.
(c) Drag area. You may use ΔC
Table 2 of § 1037.515—Bin Determinations for Trailers Based on Aerodynamic Test Results
[Δ
If a trailer's measured Δ | Designate the trailer as . . . | And use the following value for Δ | ≤0.09 | Bin I | 0.0 | 0.10-0.39 | Bin II | 0.1 | 0.40-0.69 | Bin III | 0.4 | 0.70-0.99 | Bin IV | 0.7 | 1.00-1.39 | Bin V | 1.0 | 1.40-1.79 | Bin VI | 1.4 | ≥1.80 | Bin VII | 1.8 |
---|
(d) Weight reduction. Determine weight reduction for a trailer configuration by summing all applicable values, as follows:
(1) Determine weight reduction for using lightweight materials for wheels as described in § 1037.520(e).
(2) Apply weight reductions for other components made with light-weight materials as shown in the following table:
Table 3 of § 1037.515—Weight Reductions for Trailers
[pounds]
Component | Material | Weight
reduction (pounds) | Structure for Suspension Assembly | Aluminum | 280 | Hub and Drum (per axle) | Aluminum | 80 | Floor | Aluminum | 375 | Floor | Composite (wood and plastic) | 245 | Floor Crossmembers | Aluminum | 250 | Landing Gear | Aluminum | 50 | Rear Door | Aluminum | 187 | Rear Door Surround | Aluminum | 150 | Roof Bows | Aluminum | 100 | Side Posts | Aluminum | 300 | Slider Box | Aluminum | 150 | Upper Coupler Assembly | Aluminum | 430 |
---|
a For tandem-axle suspension sub-frames made of aluminum, apply a weight reduction of 280 pounds. Use good engineering judgment to estimate a weight reduction for using aluminum sub-frames with other axle configurations.
b Calculate a smaller weight reduction for short trailers by multiplying the indicated values by 0.528 (28/53).
(e) Off-cycle. You may apply the off-cycle provisions of § 1037.610 to trailers as follows:
(1) You may account for weight reduction based on measured values instead of using paragraph (d) of this section. Quantify the weight reduction by measuring the weight of a trailer in a certified configuration and comparing it to the weight of an equivalent trailer without weight-reduction technologies. This qualifies as A to B testing under § 1037.610. Use good engineering judgment to select an equivalent trailer representing a baseline configuration. Use the calculated weight reduction in Eq. 1037.515-1 to calculate the trailer's CO
(2) If your off-cycle technology reduces emissions in a way that is proportional to measured emissions as described in § 1037.610(b)(1), multiply the trailer's CO
(3) If your off-cycle technology does not yield emission reductions that are proportional to measured emissions, as described in § 1037.610(b)(2), calculate an adjusted CO
(4) Note that these off-cycle provisions do not apply for trailers subject to design standards.