(a) The following duty cycles apply for constant-speed engines:
(1) The following duty cycle applies for discrete-mode testing:
| D2 mode number | Engine speed | Torque (percent)1 |
Weighting factors |
|---|---|---|---|
| 1 | Engine governed | 100 | 0.05 |
| 2 | Engine governed | 75 | 0.25 |
| 3 | Engine governed | 50 | 0.30 |
| 4 | Engine governed | 25 | 0.30 |
| 5 | Engine governed | 10 | 0.10 |
1The percent torque is relative to maximum test torque.
(2) The following duty cycle applies for ramped-modal testing:
| RMC mode | Time in mode (seconds) |
Engine speed | Torque (percent)1 2 |
|---|---|---|---|
| 1a Steady-state | 53 | Engine governed | 100. |
| 1b Transition | 20 | Engine governed | Linear transition. |
| 2a Steady-state | 101 | Engine governed | 10. |
| 2b Transition | 20 | Engine governed | Linear transition. |
| 3a Steady-state | 277 | Engine governed | 75. |
| 3b Transition | 20 | Engine governed | Linear transition. |
| 4a Steady-state | 339 | Engine governed | 25. |
| 4b Transition | 20 | Engine governed | Linear transition. |
| 5 Steady-state | 350 | Engine governed | 50. |
1The percent torque is relative to maximum test torque.
2Advance from one mode to the next within a 20-second transition phase. During the transition phase, command a linear progression from the torque setting of the current mode to the torque setting of the next mode.
(b) The following duty cycles apply for variable-speed engines with maximum engine power below 19 kW:
(1) The following duty cycle applies for discrete-mode testing:
| G2 mode number | Engine speed1 | Torque (percent)2 |
Weighting factors |
|---|---|---|---|
| 1 | Maximum test speed | 100 | 0.09 |
| 2 | Maximum test speed | 75 | 0.20 |
| 3 | Maximum test speed | 50 | 0.29 |
| 4 | Maximum test speed | 25 | 0.30 |
| 5 | Maximum test speed | 10 | 0.07 |
| 6 | Warm idle | 0 | 0.05 |
1Speed terms are defined in 40 CFR part 1065.
2The percent torque is relative to the maximum torque at the commanded test speed.
(2) The following duty cycle applies for ramped-modal testing:
| RMC mode | Time in mode (seconds) |
Engine speed1 3 | Torque (percent)2 3 |
|---|---|---|---|
| 1a Steady-state | 41 | Warm idle | 0. |
| 1b Transition | 20 | Linear transition | Linear transition. |
| 2a Steady-state | 135 | Maximum test speed | 100. |
| 2b Transition | 20 | Maximum test speed | Linear transition. |
| 3a Steady-state | 112 | Maximum test speed | 10. |
| 3b Transition | 20 | Maximum test speed | Linear transition. |
| 4a Steady-state | 337 | Maximum test speed | 75. |
| 4b Transition | 20 | Maximum test speed | Linear transition. |
| 5a Steady-state | 518 | Maximum test speed | 25. |
| 5b Transition | 20 | Maximum test speed | Linear transition. |
| 6a Steady-state | 494 | Maximum test speed | 50. |
| 6b Transition | 20 | Linear transition | Linear transition. |
| 7 Steady-state | 43 | Warm idle | 0. |
1Speed terms are defined in 40 CFR part 1065.
2The percent torque is relative to the maximum torque at the commanded engine speed.
3Advance from one mode to the next within a 20-second transition phase. During the transition phase, command a linear progression from the torque setting of the current mode to the torque setting of the next mode, and simultaneously command a similar linear progression for engine speed if there is a change in speed setting.
(c) The following duty cycles apply for variable-speed engines with maximum engine power at or above 19 kW:
(1) The following duty cycle applies for discrete-mode testing:
| C1 mode number | Engine speed1 | Torque (percent)2 |
Weighting factors |
|---|---|---|---|
| 1 | Maximum test speed | 100 | 0.15 |
| 2 | Maximum test speed | 75 | 0.15 |
| 3 | Maximum test speed | 50 | 0.15 |
| 4 | Maximum test speed | 10 | 0.10 |
| 5 | Intermediate test speed | 100 | 0.10 |
| 6 | Intermediate test speed | 75 | 0.10 |
| 7 | Intermediate test speed | 50 | 0.10 |
| 8 | Warm idle | 0 | 0.15 |
1Speed terms are defined in 40 CFR part 1065.
2The percent torque is relative to the maximum torque at the commanded test speed.
(2) The following duty cycle applies for ramped-modal testing:
| RMC mode | Time in mode (seconds) |
Engine speed1 3 | Torque (percent)2 3 |
|---|---|---|---|
| 1a Steady-state | 126 | Warm Idle | 0. |
| 1b Transition | 20 | Linear Transition | Linear Transition. |
| 2a Steady-state | 159 | Intermediate Speed | 100. |
| 2b Transition | 20 | Intermediate Speed | Linear Transition. |
| 3a Steady-state | 160 | Intermediate Speed | 50. |
| 3b Transition | 20 | Intermediate Speed | Linear Transition. |
| 4a Steady-state | 162 | Intermediate Speed | 75. |
| 4b Transition | 20 | Linear Transition | Linear Transition. |
| 5a Steady-state | 246 | Maximum Test Speed | 100. |
| 5b Transition | 20 | Maximum Test Speed | Linear Transition. |
| 6a Steady-state | 164 | Maximum Test Speed | 10. |
| 6b Transition | 20 | Maximum Test Speed | Linear Transition. |
| 7a Steady-state | 248 | Maximum Test Speed | 75. |
| 7b Transition | 20 | Maximum Test Speed | Linear Transition. |
| 8a Steady-state | 247 | Maximum Test Speed | 50. |
| 8b Transition | 20 | Linear Transition | Linear Transition. |
| 9 Steady-state | 128 | Warm Idle | 0. |
1Speed terms are defined in 40 CFR part 1065.
2The percent torque is relative to the maximum torque at the commanded engine speed.
3Advance from one mode to the next within a 20-second transition phase. During the transition phase, command a linear progression from the torque setting of the current mode to the torque setting of the next mode, and simultaneously command a similar linear progression for engine speed if there is a change in speed setting.
[69 FR 39213, June 29, 2004, as amended at 73 FR 37241, June 30, 2008]
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