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Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Rules and Regulations
TABLE 1 OF 1065.905SUMMARY OF TESTING REQUIREMENTS SPECIFIED OUTSIDE OF THIS SUBPARTContinued Subpart
Applicability for field testing a
Applicability for laboratory or similar testing with PEMS without restriction a
K: Definitions and reference materials.

Use all

Use all

a Refer
Applicability for laboratory or similar testing with PEMS with restrictions a Use all.

to paragraphs d and e of this section for complete specifications.

370. Amend 1065.910 by revising paragraph a2 to read as follows:

1065.910 PEMS auxiliary equipment for field testing.

a
2 Tubing. We recommend using rigid 300 series stainless steel tubing to connect between flexible connectors.
Tubing may be straight or bent to accommodate vehicle geometry. You
may use T or Y fittings to join multiple connections, or you may cap or plug redundant flow paths if the engine manufacturer recommends it.

371. Amend 1065.915 by revising paragraph a to read as follows:
1065.915

PEMS instruments.

a Instrument specifications. We recommend that you use PEMS that
meet the specifications of subpart C of this part. For unrestricted use of PEMS
in a laboratory or similar environment, use a PEMS that meets the same specifications as each lab instrument it replaces. For field testing or for testing with PEMS in a laboratory or similar environment, under the provisions of 1065.905b, the specifications in the following table apply instead of the specifications in Table 1 of 1065.205:

TABLE 1 OF 1065.915RECOMMENDED MINIMUM PEMS MEASUREMENT INSTRUMENT PERFORMANCE
Measurement
Measured quantity symbol
Rise time, t1090, and Fall time, t9010

Recording update frequency
Engine speed transducer

fn

1 s

1 Hz means

Engine torque estimator, BSFC
This is a signal from an engines ECM.
General pressure transducer not a part of another instrument.
Atmospheric pressure meter
General temperature sensor not a part of another instrument.
General dewpoint sensor
Exhaust flow meter

T or BSFC

1 s

1 Hz means

p

5 s

1 Hz

patmos
T

50 s
5 s

0.1 Hz
1 Hz

Tdew
n

50 s
1 s

0.1 Hz
1 Hz means

Dilution air, inlet air, exhaust, and sample flow meters.
Continuous gas analyzer

n

1 s

1 Hz means

x

5 s

1 Hz

Gravimetric PM balance
Inertial PM balance

mPM
mPM

Accuracy a
Repeatability a
Noise a
5% of pt. or 1%
of max.
8% of pt. or 5%
of max.

2% of pt. or 1%
of max.
2% of pt. or 1%
of max.

0.5% of max.

5% of pt. or 5%
of max.
250 Pa
1% of pt. K or 5
K.
3 K
5% of pt. or 3%
of max.
2.5% of pt. or 1.5% of max.
4% of pt. or 4%
of meas.
See 1065.790
4% of pt. or 4%
of meas.

2% of pt. or 0.5% of max.
200 Pa
0.5% of pt. K or 2 K.
1 K
2% of pt

1% of max.

1.25% of pt. or 0.75% of max.
2% of pt. or 2%
of meas.
0.5 g.
2% of pt. or 2%
of meas.

1% of max.

1% of max.

100 Pa.
0.5% of max 0.5
K.
1 K.
2% of max.

1% of max.
1% of max.

a Accuracy, repeatability, and noise are all determined with the same collected data, as described in 1065.305, and based on absolute values. pt. refers to the overall flow-weighted mean value expected at the standard; max. refers to the peak value expected at the standard over any test interval, not the maximum of the instruments range; meas refers to the actual flow-weighted mean measured over any test interval.

372. Amend 1065.1001 by adding a definition for Enhanced-idle in alphabetical order and revising the definition for Test interval to read as follows:

1065.1001

Definitions.

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Enhanced-idle means a mode of engine idle operation where idle speed is elevated above warm idle speed as determined by the electronic control module, for example during engine
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warm-up or to increase exhaust temperature.

Test interval means a duration of time over which you determine mass of emissions. For example, the standardsetting part may specify a complete laboratory duty cycle as a cold-start test interval, plus a hot-start test interval. As another example, a standard-setting part may specify a field-test interval, such as a not-to-exceed NTE event, as a duration of time over which an engine operates within a certain range of speed and torque. In cases where multiple test intervals occur over a duty cycle, the
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standard-setting part may specify additional calculations that weight and combine results to arrive at composite values for comparison against the applicable standards in this chapter.

373. Amend 1065.1005 by revising paragraphs a, c, d, e, f2, and g to read as follows:
1065.1005 Symbols, abbreviations, acronyms, and units of measure.

a Symbols for quantities. This part uses the following symbols and units of measure for various quantities:

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