86.1362-2007—Steady-state testing with a ramped-modal cycle.
This section describes how to test engines under steady-state conditions. Manufacturers may alternatively use the procedures specified in § 86.1363-2007 through the 2009 model year.
(a)
Start sampling at the beginning of the first mode and continue sampling until the end of the last mode. Calculate emissions as described in 40 CFR 1065.650 and cycle statistics as described in 40 CFR 1065.514.
(b)
Measure emissions by testing the engine on a dynamometer with the following ramped-modal duty cycle to determine whether it meets the applicable steady-state emission standards:
| RMC mode | Time in mode (seconds) | Enginespeed 1,2 | Torque(percent) 2,3 |
|---|---|---|---|
| 1a Steady-state | 170 | Warm Idle | 0 |
| 1b Transition | 20 | Linear Transition | Linear Transition |
| 2a Steady-state | 170 | A | 100 |
| 2b Transition | 20 | A | Linear Transition |
| 3a Steady-state | 102 | A | 25 |
| 3b Transition | 20 | A | Linear Transition |
| 4a Steady-state | 100 | A | 75 |
| 4b Transition | 20 | A | Linear Transition |
| 5a Steady-state | 103 | A | 50 |
| 5b Transition | 20 | Linear Transition | Linear Transition |
| 6a Steady-state | 194 | B | 100 |
| 6b Transition | 20 | B | Linear Transition |
| 7a Steady-state | 219 | B | 25 |
| 7b Transition | 20 | B | Linear Transition |
| 8a Steady-state | 220 | B | 75 |
| 8b Transition | 20 | B | Linear Transition |
| 9a Steady-state | 219 | B | 50 |
| 9b Transition | 20 | Linear Transition | Linear Transition |
| 10a Steady-state | 171 | C | 100 |
| 10b Transition | 20 | C | Linear Transition |
| 11a Steady-state | 102 | C | 25 |
| 11b Transition | 20 | C | Linear Transition |
| 12a Steady-state | 100 | C | 75 |
| 12b Transition | 20 | C | Linear Transition |
| 13a Steady-state | 102 | C | 50 |
| 13b Transition | 20 | Linear Transition | Linear Transition |
| 14 Steady-state | 168 | Warm Idle | 0 |
| 1 Speed terms are 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 speed or torque setting of the current mode to the speed or torque setting of the next mode. | |||
| 3 The percent torque is relative to maximum torque at the commanded engine speed. | |||
(f)
Perform the ramped-modal test with a warmed-up engine. If the ramped-modal test follows directly after testing over the Federal Test Procedure, consider the engine warm. Otherwise, operate the engine to warm it up as described in 40 CFR part 1065, subpart F.