Source: http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&rgn=div8&view=text&node=40:33.0.1.1.10.6.1.2&idno=40
Timestamp: 2014-09-02 14:24:29
Document Index: 744657977

Matched Legal Cases: ['art 1048', '§1048', '§1048', 'art 1065', '§1048', '§1048', 'art 1065', '§1048', 'art 1065', 'art 1039', '§1048', '§1048']

Title 40 → Chapter I → Subchapter U → Part 1048 → Subpart F → §1048.505
§1048.505 How do I test engines using steady-state duty cycles, including ramped-modal testing?This section describes how to test engines under steady-state conditions. In some cases, we allow you to choose the appropriate steady-state duty cycle for an engine; you may also choose between discrete-mode and ramped-modal testing. In all cases, you must use the duty cycle you select in your application for certification for all testing you perform for that engine family. If we test your engines to confirm that they meet emission standards, we will use the duty cycles you select for your own testing. If you submit certification test data using more than one duty cycle, any of the selected duty cycles may be used for any subsequent testing. We may also perform other testing as allowed by the Clean Air Act.(a) You may perform steady-state testing with either discrete-mode or ramped-modal cycles described in 40 CFR Part 1065.(b) Measure emissions by testing the engine on a dynamometer with one or more of the following sets of duty cycles to determine whether it meets the steady-state emission standards in §1048.101(b):(1) For engines from an engine family that will be used only in variable-speed applications, use one of the following duty cycles:(i) The following duty cycle applies for discrete-mode testing:
Table 1 of §1048.505 C2 mode No.Engine speed1 Torque(percent)2 Weightingfactors1Maximum test speed250.062Intermediate test1000.023Intermediate test750.054Intermediate test500.325Intermediate test250.306Intermediate test100.107Warm idle00.151Speed terms are defined in 40 CFR part 1065.2The percent torque is relative to the maximum torque at the given engine speed.(ii) The following duty cycle applies for ramped-modal testing:
Table 2 of §1048.505 RMC mode Time in mode(seconds) Engine speed1 2 Torque(percent)2 3 1a Steady-state119Warm idle0 1b Transition20Linear transitionLinear transition.2a Steady-state29Intermediate speed100 2b Transition20Intermediate speedLinear transition.3a Steady-state150Intermediate speed10 3b Transition20Intermediate speedLinear transition.4a Steady-state80Intermediate speed75 4b Transition20Intermediate speedLinear transition.5a Steady-state513Intermediate speed25 5b Transition20Intermediate speedLinear transition.6a Steady-state549Intermediate speed50 6b Transition20Linear transitionLinear transition.7a Steady-state96Maximum test speed25 7b Transition20Linear transitionLinear transition.8 Steady-state124Warm idle0 1Speed terms are defined in 40 CFR part 1065.2Advance 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.3The percent torque is relative to maximum torque at the commanded engine speed.(2) For engines from an engine family that will be used only at a single, rated speed, use the 5-mode duty cycle or the corresponding ramped-modal cycle described in 40 CFR part 1039, Appendix II, paragraph (a).(3) Use a duty cycle from both paragraphs (b)(1) and (b)(2) of this section if you will not restrict an engine family to constant-speed or variable-speed applications.(4) Use a duty cycle specified in paragraph (b)(2) of this section for all severe-duty engines.(5) For high-load engines, use one of the following duty cycles:(i) The following duty cycle applies for discrete-mode testing:
Table 3 of §1048.505Mode No.EnginespeedTorque(percent)1Minimum time in mode (minutes)Weighting factors1Maximum test speed1003.00.502Maximum test speed753.00.501The percent torque is relative to the maximum torque at maximum test speed.(ii) The following duty cycle applies for discrete-mode testing:
Table 4 of §1048.505 RMC modes Time in mode(seconds) Engine speed(percent) Torque(percent)1 2 1a Steady-state290Engine governed100 1b Transition20Engine governedLinear transition.2 Steady-state290Engine governed75 1The percent torque is relative to maximum test torque.2Advance 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) For full-load operating modes, operate the engine at wide-open throttle.
[73 FR 59239, Oct. 8, 2008, as amended at 75 FR 23022, Apr. 30, 2010;79 FR 23751. Apr. 28, 2014]