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Code of Federal Regulations (Last Updated: November 8, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter U - Air Pollution Controls |
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Part 1039 - Control of Emissions from New and in-Use Nonroad Compression-Ignition Engines |
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Subpart I - Definitions and Other Reference Information |
Appendix IV to Part 1039 - Steady-State Duty Cycles for Variable-Speed Engines With Maximum Power at or Above 19 kW]
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(a) The following duty cycle applies for discrete-mode testing of variable-speed engines with maximum power at or above 19 kW:
C1 mode - number
Engine speed 1 Observed 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 Idle 0 0.15 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.(b) The following duty cycle applies for ramped-modal testing of variable-speed engines with maximum power at or above 19 kW:
RMC Mode Time in mode - (seconds)
Engine - speed
1,3 Torque - (percent)
2,3 1a Steady-state 126 Warm Idle 0. 1b Transition 20 Linear Transition 2 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. 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.Effective Date Note: At 73 FR 37243, June 30, 2008, Appendix IV to Part 1039 was removed, effective July 7, 2008.