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Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 1045, App. II—DUTY CYCLES FOR PROPULSION MARINE ENGINES

Current as of January 02, 2025 | Updated by Findlaw Staff

(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 12

Torque (percent) 23

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.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 1045, App. II—DUTY CYCLES FOR PROPULSION MARINE ENGINES - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-pt-40-1045-app-ii/

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