(a) Starting in model year 2021, you must measure CO2 emissions using the ramped-modal cycle in 40 CFR 86.1362 as described in §1036.501, or using the ramped-modal cycle in this section.
(b) Measure emissions using the ramped-modal duty cycle shown in the following table to determine whether engines meet the steady-state compression-ignition standards specified in subpart B of this part:
Table 1 of §1036.505—Ramped-Modal Duty Cycle
| RMC mode | Time in mode (seconds) |
Engine speed12 |
Torque (percent)23 |
|---|---|---|---|
| 1a Steady-state | 124 | Warm Idle | 0. |
| 1b Transition | 20 | Linear Transition | Linear Transition. |
| 2a Steady-state | 196 | A | 100. |
| 2b Transition | 20 | Linear Transition | Linear Transition. |
| 3a Steady-state | 220 | B | 50. |
| 3b Transition | 20 | B | Linear Transition. |
| 4a Steady-state | 220 | B | 75. |
| 4b Transition | 20 | Linear Transition | Linear Transition. |
| 5a Steady-state | 268 | A | 50. |
| 5b Transition | 20 | A | Linear Transition. |
| 6a Steady-state | 268 | A | 75. |
| 6b Transition | 20 | A | Linear Transition. |
| 7a Steady-state | 268 | A | 25. |
| 7b Transition | 20 | Linear Transition | Linear Transition. |
| 8a Steady-state | 196 | B | 100. |
| 8b Transition | 20 | B | Linear Transition. |
| 9a Steady-state | 196 | B | 25. |
| 9b Transition | 20 | Linear Transition | Linear Transition. |
| 10a Steady-state | 28 | C | 100. |
| 10b Transition | 20 | C | Linear Transition. |
| 11a Steady-state | 4 | C | 25. |
| 11b Transition | 20 | C | Linear Transition. |
| 12a Steady-state | 4 | C | 75. |
| 12b Transition | 20 | C | Linear Transition. |
| 13a Steady-state | 4 | C | 50. |
| 13b Transition | 20 | Linear Transition | Linear Transition. |
| 14 Steady-state | 144 | Warm Idle | 0. |
1Speed terms are defined in 40 CFR part 1065.
2Advance from one mode to the next within a 20 second transition phase. During the transition phase, command a linear progression from the speed or torque setting of the current mode to the speed or torque setting of the next mode.
3The percent torque is relative to maximum torque at the commanded engine speed.
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