Appendix II - Appendix II to Part 1042 - Steady-State Duty Cycles

(a) The following duty cycles apply as specified in § 1042.505(b)(1):

(1) The following duty cycle applies for discrete-mode testing:

E3 mode No. Engine speed 1Percent of
maximum
test power
Weighting
factors
1Maximum test speed1000.2 291%750.5 380%500.15 463%250.15

1 Maximum test speed is defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed.

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

RMC
mode
Time in mode
(seconds)
Engine
speed 1 3
Power
(percent) 2 3
1a Steady-state229Maximum test speed100%. 1b Transition20Linear transitionLinear transition in torque. 2a Steady-state16663%25%. 2b Transition20Linear transitionLinear transition in torque. 3a Steady-state57091%75%. 3b Transition20Linear transitionLinear transition in torque. 4a Steady-state17580%50%.

1 Maximum test speed is defined in 40 CFR part 1065. Percent speed is relative to maximum test speed.

2 The percent power is relative to the maximum test power.

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.

(b) The following duty cycles apply as specified in § 1042.505(b)(2):

(1) The following duty cycle applies for discrete-mode testing:

E5 mode No. Engine
speed 1
Percent of
maximum
test power
Weighting
factors
1Maximum test speed1000.08 291%750.13 380%500.17 463%250.32 5Warm idle00.3

1 Maximum test speed is defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed.

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

RMC
mode
Time in mode
(seconds)
Engine
speed 1 3
Power
(percent) 2 3
1a Steady-state167Warm idle0. 1b Transition20Linear transitionLinear transition in torque. 2a Steady-state85Maximum test speed100%. 2b Transition20Linear transitionLinear transition in torque. 3a Steady-state35463%25%. 3b Transition20Linear transitionLinear transition in torque. 4a Steady-state14191%75%. 4b Transition20Linear transitionLinear transition in torque. 5a Steady-state18280%50%. 5b Transition20Linear transitionLinear transition in torque. 6 Steady-state171Warm idle0.

1 Maximum test speed is defined in 40 CFR part 1065. Percent speed is relative to maximum test speed.

2 The percent power is relative to the maximum test power.

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 as specified in § 1042.505(b)(3):

(1) The following duty cycle applies for discrete-mode testing:

E2 mode No. Engine
speed 1
Torque
(percent) 2
Weighting
factors
1Engine Governed1000.2 2Engine Governed750.5 3Engine Governed500.15 4Engine Governed250.15

1 Speed terms are defined in 40 CFR part 1065.

2 The percent torque is relative to the maximum test torque as defined in 40 CFR part 1065.

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

RMC mode Time in mode
(seconds)
Engine speed Torque
(percent) 1 2
1a Steady-state229Engine Governed100%. 1b Transition20Engine GovernedLinear transition. 2a Steady-state166Engine Governed25%. 2b Transition20Engine GovernedLinear transition. 3a Steady-state570Engine Governed75%. 3b Transition20Engine GovernedLinear transition. 4a Steady-state175Engine Governed50%.

1 The percent torque is relative to the maximum test torque as defined in 40 CFR part 1065.

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.

[81 FR 74156, Oct. 25, 2016]