Appendix III to Part 1039 - Steady-State Duty Cycles for Variable-Speed Engines With Maximum Power Below 19 kW

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(a) The following duty cycle applies for discrete-mode testing of variable-speed engines with maximum power below 19 kW:
G2 mode
number

Engine speed 1

Observed torque

(percent) 2

Weighting

factors

1Maximum test speed1000.09

2Maximum test speed750.20

3Maximum test speed500.29

4Maximum test speed250.30

5Maximum test speed100.07

6Idle00.05

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.

(b) The following duty cycle applies for ramped-modal testing of variable-speed engines with maximum power below 19 kW:

RMC

mode

Time in mode

(seconds)

Engine speed 1,3Torque

(percent) 2,3

1a Steady-state41Warm Idle0.1b Transition20Linear transitionLinear transition.2a Steady-state135Maximum Test Speed100.2b Transition20Maximum Test SpeedLinear transition.3a Steady-state112Maximum Test Speed10.3b Transition20Maximum Test SpeedLinear transition.4a Steady-state337Maximum Test Speed75.4b Transition20Maximum Test SpeedLinear transition.5a Steady-state518Maximum Test Speed25.5b Transition20Maximum Test SpeedLinear transition.6a Steady-state494Maximum Test Speed50.6b Transition20Linear transitionLinear transition.7 Steady-state43Warm Idle0.1 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 III to Part 1039 was removed, effective July 7, 2008.

                    
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