40 CFR Appendix II to Part 1054 - Duty Cycles for Laboratory Testing

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Appendix II to Part 1054 - Duty Cycles for Laboratory Testing

(a) Test handheld engines with the following steady-state duty cycle:

G3 mode No. Engine speed a Torque
(percent) b
Weighting factors
1 Rated speed 100 0.85
2 Warm idle 0 0.15

a Test engines at the specified speeds as described in § 1054.505.

b Test engines at 100 percent torque by setting operator demand to maximum. Control torque during idle at its warm idle speed as described in 40 CFR 1065.510.

(b) Test nonhandheld engines with one of the following steady-state duty cycles:

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

G2 mode No. a Torque
(percent) b
Weighting factors
1 100 0.09
2 75 0.2
3 50 0.29
4 25 0.3
5 10 0.07
6 0 0.05

a Control engine speed as described in § 1054.505. Control engine speed for Mode 6 as described in § 1054.505(c) for idle operation.

b The percent torque is relative to the value established for full-load torque, as described in § 1054.505.

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

Table 3 to Paragraph (b)(2)

RMC mode a Time in mode
(seconds)
Torque
(percent) b c
1a Steady-state 41 0.
1b Transition 20 Linear transition.
2a Steady-state 135 100.
2b Transition 20 Linear transition.
3a Steady-state 112 10.
3b Transition 20 Linear transition.
4a Steady-state 337 75.
4b Transition 20 Linear transition.
5a Steady-state 518 25.
5b Transition 20 Linear transition.
6a Steady-state 494 50.
6b Transition 20 Linear transition.
7 Steady-state 43 0.

a Control engine speed as described in § 1054.505. Control engine speed for Mode 6 as described in § 1054.505(c) for idle operation.

b 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.

c The percent torque is relative to the value established for full-load torque, as described in § 1054.505.

[73 FR 59259, Oct. 8, 2008, as amended at 86 FR 34527, June 29, 2021]