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

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View PDF at GPO Pt. 1039, App. II
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 2013-07-01

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.

  • 2014-02-06; vol. 79 # 25 - Thursday, February 6, 2014
    1. 79 FR 7077 - Nonroad Technical Amendments
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on March 10, 2014, except for § 1039.625(m) which will be effective on February 6, 2014.
      40 CFR Parts 1039, 1042, and 1068

Title 40 published on 2013-07-01

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

  • 2014-02-06; vol. 79 # 25 - Thursday, February 6, 2014
    1. 79 FR 7077 - Nonroad Technical Amendments
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on March 10, 2014, except for § 1039.625(m) which will be effective on February 6, 2014.
      40 CFR Parts 1039, 1042, and 1068