40 CFR Part 1039, Appendix II to Part 1039 - Steady-State Duty Cycles

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Appendix II to Part 1039—Steady-State Duty Cycles
(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 Weightingfactors
1 The percent torque is relative to maximum test torque.
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
(2) The following duty cycle applies for ramped-modal testing:
RMC mode Time in mode(seconds) Engine speed Torque(percent) 1, 2
1 The percent torque is relative to maximum test torque.
2 Advance 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.
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.
(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 speed 1 Torque(percent) 2 Weightingfactors
1 Speed terms are defined in 40 CFR part 1065.
2 The percent torque is relative to the maximum torque at the commanded test speed.
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
(2) The following duty cycle applies for ramped-modal testing:
RMC mode Time in mode(seconds) Engine speed 1, 3 Torque(percent) 2, 3
1 Speed terms are defined in 40 CFR part 1065.
2 The percent torque is relative to the maximum torque at the commanded engine speed.
3 Advance 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.
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.
(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 speed 1 Torque(percent) 2 Weightingfactors
1 Speed terms are defined in 40 CFR part 1065.
2 The percent torque is relative to the maximum torque at the commanded test speed.
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
(2) The following duty cycle applies for ramped-modal testing:
RMC mode Time in mode(seconds) Engine speed 1, 3 Torque(percent) 2, 3
1 Speed terms are defined in 40 CFR part 1065.
2 The percent torque is relative to the maximum torque at the commanded engine speed.
3 Advance 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.
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.
[69 FR 39213, June 29, 2004, as amended at 73 FR 37241, June 30, 2008]

Title 40 published on 2015-07-01.

The following are only the Rules published in the Federal Register after the published date of Title 40.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2015-07-28; vol. 80 # 144 - Tuesday, July 28, 2015
    1. 80 FR 44863 - Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles—Phase 2; Notice of Public Hearings and Comment Period
      GPO FDSys: XML | Text
      DEPARTMENT OF TRANSPORTATION, ENVIRONMENTAL PROTECTION AGENCY, National Highway Traffic Safety Administration
      Notice of public hearings; extension of comment period.
      NHTSA and EPA will jointly hold a public hearing on Thursday, August 6, 2015, beginning at 9:00 a.m. local time, and a second hearing on Tuesday, August 18, 2015, beginning at 9:00 a.m. local time. EPA and NHTSA will make every effort to accommodate all speakers that arrive and register. Each hearing will continue until everyone has had a chance to speak. If you would like to present oral testimony at one of these this public hearings, please contact the person identified under FOR FURTHER INFORMATION CONTACT by August 3, 2015, for the first hearing, or by August 11, 2015, for the second hearing. In order to provide commenters 30 days after the last public hearing, the comment period for the proposal is being extended through September 17, 2015.
      40 CFR Parts 9, 22, 85, 86, 600, 1033, 1036, 1037, 1039, 1042, 1065, 1066, and 1068

Title 40 published on 2015-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR Part 1039 after this date.

  • 2015-09-08; vol. 80 # 173 - Tuesday, September 8, 2015
    1. 80 FR 53756 - Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles—Phase 2; Extension of Comment Period
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, ENVIRONMENTAL PROTECTION AGENCY, National Highway Traffic Safety Administration
      Proposed rule; extension of comment period.
      The comment period for the proposed rule published July 13, 2015 (80 FR 40139) is extended. Written comments for both documents must be received on or before October 1, 2015.
      40 CFR Parts 9, 22, 85, 86, 600, 1033, 1036, 1037, 1039, 1042, 1065, 1066, and 1068