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

1Maximum test speed1000.15

2Maximum test speed750.15

3Maximum test speed500.15

4Maximum test speed100.10

5Intermediate test speed1000.10

6Intermediate test speed750.10

7Intermediate test speed500.10

8Idle00.15

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 ModeTime in mode

(seconds)

Engine

speed 1,3

Torque

(percent) 2,3

1a Steady-state126Warm Idle0.1b Transition20Linear Transition 2Linear Transition.2a Steady-state159Intermediate Speed100.2b Transition20Intermediate SpeedLinear Transition.3a Steady-state160Intermediate Speed50.3b Transition20Intermediate SpeedLinear Transition.4a Steady-state162Intermediate Speed75.4b Transition20Linear TransitionLinear Transition.5a Steady-state246Maximum Test Speed100.5b Transition20Maximum Test SpeedLinear Transition.6a Steady-state164Maximum Test Speed10.6b Transition20Maximum Test SpeedLinear Transition.7a Steady-state248Maximum Test Speed75.7b Transition20Maximum Test SpeedLinear Transition.8a Steady-state247Maximum Test Speed50.8b Transition20Linear TransitionLinear Transition.9 Steady-state128Warm 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 IV to Part 1039 was removed, effective July 7, 2008.

                    
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