40 CFR Appendix II to Part 1039: 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 Weighting factors

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

1 The percent torque is relative to maximum test torque.

(2) The following duty cycle applies for ramped-modal testing:

RMC mode Time in mode (seconds) Engine speed Torque (percent) 1 2

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.

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.

(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 Weighting factors

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

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.

(2) The following duty cycle applies for ramped-modal testing:

RMC mode Time in mode (seconds) Engine speed 1 3 Torque (percent) 2 3

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.

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.

(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 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 Warm 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.

(2) The following duty cycle applies for ramped-modal testing:

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 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.