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73 FR 59194, Oct. 8, 2008, unless otherwise noted.
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(a) The following duty cycle applies for discrete-mode testing:
| E4 Mode No. | Engine speed 1 |
Torque (percent) 2 |
Weighting factors |
|---|---|---|---|
| 1 | Maximum test speed | 100 | 0.06 |
| 2 | 80% | 71.6 | 0.14 |
| 3 | 60% | 46.5 | 0.15 |
| 4 | 40% | 25.3 | 0.25 |
| 5 | Warm idle | 0 | 0.40 |
| 1 Speed terms are defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed. | |||
| 2 Except as noted in § 1045.505, the percent torque is relative to maximum torque at maximum test speed. | |||
(b) The following duty cycle applies for ramped-modal testing:
| RMC Mode | Time in mode (seconds) |
Engine speed 1 2 | Torque (percent) 2 3 |
|---|---|---|---|
| 1a Steady-state | 225 | Idle | 0 |
| 1b Transition | 20 | Linear transition | Linear transition |
| 2a Steady-state | 63 | Maximum test speed | 100 |
| 2b Transition | 20 | Linear transition | Linear transition |
| *3a Steady-state | 271 | 40% | 25.3% |
| 3b Transition | 20 | Linear transition | Linear transition |
| 4a Steady-state | 151 | 80% | 71.6% |
| 4b Transition | 20 | Linear transition | Linear transition |
| 5a Steady-state | 161 | 60% | 46.5% |
| 5b Transition | 20 | Linear transition | Linear transition |
| 6 Steady-state | 229 | Warm idle | 0 |
| 1 Speed terms are defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed. | |||
| 2 Advance from one mode to the next within a 20-second transition phase. During the transition phase, command linear progressions of speed and torque from the speed setting and torque setting of the current mode to the speed setting and torque setting of the next mode. | |||
| 3 Except as noted in § 1045.505, the percent torque is relative to maximum torque at maximum test speed. | |||