This section applies for powertrain testing, cycle-average engine fuel mapping, certain off-cycle testing under § 1037.610 , and the advanced-technology provisions of § 1037.615 .
Where:
eCO2comp = total composite mass of CO2 emissions in g/ton-mile, rounded to the nearest whole number for vocational vehicles and to the first decimal place for tractors.
PL = the standard payload, in tons, as specified in § 1037.705 .
vmoving = mean composite weighted driven vehicle speed, excluding idle operation, as shown in table 1 to this section for Phase 2 vocational vehicles. For other vehicles, let
vmoving = 1.
w[cycle] = weighting factor for the appropriate test cycle, as shown in table 1 to this section.
m[cycle] = CO2 mass emissions over each test cycle (other than idle).
D[cycle] = the total driving distance for the indicated duty cycle. Use 2.842 miles for the transient cycle, and use 13.429 miles for both of the highway cruise cycles.
m[cycle]-idle = CO2 emission rate at idle.
Example:
Class 7 vocational vehicle meeting the Phase 2 standards based on the Regional duty cycle.
PL = 5.6 tons
vmoving = 38.41 mi/hr
wtransient = 20% = 0.20
wdrive-idle = 0% = 0
wparked-idle = 25% = 0.25
w55 = 24% = 0.24
w65 = 56% = 0.56
mtransient = 4083 g
m55 = 13834 g
m65 = 17018 g
Dtransient = 2.8449 miles
D55 = 13.429 miles
D65 = 13.429 miles
mdrive-idle = 4188 g/hr
mparked-idle = 3709 g/hr
Table 1 of § 1037.510 -Weighting Factors for Duty Cycles
Distance-weighted | Time-weighted a | Average speed during non-idle cycles (mi/hr) b | |||||
Transient (%) | 55 mi/hr cruise (%) | 65 mi/hr cruise (%) | Drive idle (%) | Parked idle (%) | Non-idle (%) | ||
Day Cabs | 19 | 17 | 64 | ||||
Sleeper Cabs | 5 | 9 | 86 | ||||
Heavy-haul tractors | 19 | 17 | 64 | ||||
Vocational-Regional | 20 | 24 | 56 | 0 | 25 | 75 | 38.41 |
Vocational-Multi-Purpose (2b-7) | 54 | 29 | 17 | 17 | 25 | 58 | 23.18 |
Vocational-Multi-Purpose (8) | 54 | 23 | 23 | 17 | 25 | 58 | 23.27 |
Vocational-Urban (2b-7) | 92 | 8 | 0 | 15 | 25 | 60 | 16.25 |
Vocational-Urban (8) | 90 | 10 | 0 | 15 | 25 | 60 | 16.51 |
Vocational with conventional powertrain (Phase 1 only) | 42 | 21 | 37 | ||||
Vocational Hybrid Vehicles (Phase 1 only) | 75 | 9 | 16 |
a Note that these drive idle and non-idle weighting factors do not reflect additional drive idle that occurs during the transient cycle. The transient cycle does not include any parked idle.
b These values apply even for vehicles not following the specified speed traces.
40 C.F.R. §1037.510