FprEN 17507

Road vehicles - Portable Emission Measuring Systems (PEMS) - Performance assessment

This document defines the procedures for assessing the performance of test equipment that is used for the on-road measurement of tailpipe emissions of light-duty vehicles, on the basis of a common test procedure that simulates the range of conditions experienced during on-road tests.
This document prescribes:
-   the tests to be conducted, and,
-   a procedure to determine, for any type of PEMS equipment, an appropriate uncertainty margin to reflect its performance over those conditions.
The key test variables are as follows (but not limited to the ones mentioned):
a)   temperature, humidity and pressure and step-wise or gradual changes,
b)   acceleration and deceleration (longitudinal and lateral),
c)   vibration, inclination and shock tests,
d)   instrument positioning on a vehicle,
e)   combinations of (1) to (4),
f)   cross-interferences,
g)   signal-processing, data treatment and time alignment, and
h)   calculation methods (excluding the regulatory post-processing of data).

Straßenfahrzeuge - Mobile Abgasmesssysteme (PEMS) - Leistungsbewertung

Véhicules routiers - Systèmes portatifs de mesure des émissions (PEMS) - Vérification de la performance

Le présent document définit les procédures d'évaluation de la performance des équipements d’essai qui sont utilisés pour les mesures sur route d'émissions d'échappement de véhicules légers, sur la base d'une procédure d’essai commune simulant la gamme des conditions rencontrées pendant des essais sur route.
Le présent document spécifie :
- les essais à réaliser et,
- une procédure permettant de déterminer, pour tout type d’équipement PEMS donné, une marge d'incertitude appropriée afin de refléter sa performance dans toutes les conditions suivantes.
Les variables d'essai clés sont les suivantes, mais sans s'y limiter :
a) température, humidité et pression et variations échelonnées ou progressives,
b) accélération et décélération (longitudinale et latérale),
c) essai de vibrations, d'inclinaison et de chocs,
d) positionnement de l'instrument sur un véhicule,
e) combinaisons de (1) et (4),
f) brouillage réciproque,
g) traitement des signaux, traitement des données et alignement temporel, et
h) méthodes de calcul (sauf traitement ultérieur réglementaire des données).

Cestna vozila - Prenosni sistemi za merjenje emisij (PEMS) - Ocenjevanje delovanja

General Information

• Status: Not Published
• ICS: 43.180 - Diagnostic, maintenance and test equipment
• Technical Committee: CEN/TC 301 - Electrically propelled road vehicles
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Due Date: 10-Jun-2021
• Completion Date: 10-Jun-2021
• Ref Project: kSIST FprEN 17507:2021 - Road Vehicles - Portable Emission Measuring Systems (PEMS) - Performance Assessment

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 17507:2020
01-julij-2020
Cestna vozila - Prenosni sistemi za merjenje emisij (PEMS) - Ocenjevanje
delovanja
Road Vehicles - Portable Emission Measuring Systems (PEMS) - Performance
Assessment
Straßenfahrzeuge - Mobile Abgasmesssysteme (PEMS) - Leistungsbewertung

Véhicules routiers - Systèmes portatifs de mesure des émissions (PEMS) - Vérification

de la performance
Ta slovenski standard je istoveten z: prEN 17507
ICS:
43.180 Diagnostična, vdrževalna in Diagnostic, maintenance and
preskusna oprema test equipment
oSIST prEN 17507:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 17507:2020
---------------------- Page: 2 ----------------------
oSIST prEN 17507:2020
DRAFT
EUROPEAN STANDARD
prEN 17507
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2020
ICS 43.180
English Version
Road Vehicles - Portable Emission Measuring Systems
(PEMS) - Performance Assessment

Véhicules routiers - Systèmes portatifs de mesure des Straßenfahrzeuge - Mobile Abgasmesssysteme (PEMS)

émissions (PEMS) - Vérification de la performance - Leistungsbewertung

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 301.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17507:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
Contents Page

European foreword ............................................................................................................................................ 5

Introduction .......................................................................................................................................................... 6

1 Scope .......................................................................................................................................................... 7

2 Normative references .......................................................................................................................... 7

3 Terms, definitions and symbols ...................................................................................................... 7

3.1 Terms and definitions ......................................................................................................................... 7

3.2 Symbols and abbreviations ............................................................................................................... 8

4 Proposed document structure including requirements, responsibilities and results 9

5 PEMS requirements and equipment ............................................................................................ 11

5.1 General requirements ....................................................................................................................... 11

5.1.1 Boundary conditions ......................................................................................................................... 11

5.1.2 Temperature......................................................................................................................................... 11

5.1.3 Altitude / Pressure ............................................................................................................................. 12

5.1.4 Humidity ................................................................................................................................................ 12

5.1.5 Vibration ................................................................................................................................................ 13

5.1.6 PEMS battery voltage test ................................................................................................................ 13

5.2 Gaseous analysers .............................................................................................................................. 15

5.2.1 General requirements and prerequisites on the performance testing of a gaseous

PEMS system ......................................................................................................................................... 15

5.2.2 Performance test execution, test matrix and test setup ....................................................... 16

5.2.3 Tests ......................................................................................................................................................... 18

5.3 Particle number analysers .............................................................................................................. 21

5.3.1 Setup for vibration tests ................................................................................................................... 21

5.3.2 Setup for temperature tests ............................................................................................................ 21

5.3.3 Setup for pressure tests .................................................................................................................... 22

5.3.4 Outline Procedures ............................................................................................................................ 23

5.3.5 Tests ......................................................................................................................................................... 24

5.4 Exhaust mass flow meter (EFM) .................................................................................................... 27

5.4.1 General requirement ......................................................................................................................... 27

5.4.2 PEMS installation ................................................................................................................................ 27

5.4.3 Data analysis ......................................................................................................................................... 28

5.5 GPS (distance measurement) ......................................................................................................... 28

6 Uncertainty assessment of the individual components of PEMS ....................................... 28

6.1 Auxiliary equipment .......................................................................................................................... 28

6.2 Weather station ................................................................................................................................... 29

6.3 GPS ............................................................................................................................................................ 29

6.4 Exhaust gas parameters ................................................................................................................... 29

6.4.1 Exhaust flow meter ............................................................................................................................. 29

6.5 General requirements for gas analysers .................................................................................... 31

6.5.1 Permissible types of analysers....................................................................................................... 31

6.5.2 Analyser specifications ..................................................................................................................... 31

6.5.3 Response time check of the analytical system ......................................................................... 32

6.6 CO/CO analysers ................................................................................................................................ 33

6.6.1 General.................................................................................................................................................... 33

---------------------- Page: 4 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)

6.6.2 CO analyser interference check ..................................................................................................... 33

6.7 NO/NO2 analysers .............................................................................................................................. 33

6.7.1 General ................................................................................................................................................... 33

6.7.2 Efficiency test for NOx converters ................................................................................................ 33

6.7.3 CLD analyser quench check............................................................................................................. 34

6.7.4 Sample dryer ........................................................................................................................................ 36

6.7.5 Sample dryer NO2 penetration ...................................................................................................... 36

6.7.6 Quench check for NDUV analysers ............................................................................................... 36

6.8 Analysers for measuring (solid) particle emissions (particle number) ......................... 37

6.8.1 General ................................................................................................................................................... 37

6.8.2 Efficiency requirements ................................................................................................................... 37

6.8.3 Linearity requirements .................................................................................................................... 37

6.8.4 Volatile removal efficiency .............................................................................................................. 38

7 Theoretical PEMS measurement uncertainty based on PEMS components .................. 38

7.1 General ................................................................................................................................................... 38

7.2 Overview of technical requirements for PEMS ........................................................................ 38

7.3 PEMS uncertainty framework ........................................................................................................ 38

7.4 PEMS uncertainty at other emission levels ............................................................................... 40

7.5 Examples ................................................................................................................................................ 40

7.5.1 General ................................................................................................................................................... 40

7.5.2 Example of PEMS reporting uncertainty .................................................................................... 40

7.5.3 Example of PEMS uncertainty at various levels ....................................................................... 41

7.5.4 Example of PEMS validation test uncertainty........................................................................... 42

8 Evaluation of uncertainty of performance testing .................................................................. 42

8.1 Overarching descriptions ................................................................................................................ 42

8.1.1 Metrological-statistical basics ....................................................................................................... 42

8.1.2 Measurement uncertainty for mobile exhaust emission measurements ...................... 43

8.2 RDE measurement process ............................................................................................................. 45

8.3 Traceability of mobile exhaust emission measurement systems ..................................... 45

8.4 Uncertainty of the measurement equipment (PEMS) in comparison to the

measurement process (RDE measurement) ............................................................................. 46

8.5 Uncertainty contributions on the inspection process (Ishikawa-Diagram) ................. 46

8.5.1 General ................................................................................................................................................... 46

8.5.2 Measurement system ........................................................................................................................ 47

8.5.3 Measurement object .......................................................................................................................... 48

8.5.4 Measurement method ....................................................................................................................... 48

8.5.5 Operator ................................................................................................................................................. 48

8.5.6 Environment ......................................................................................................................................... 49

8.6 Uncertainty evaluations ................................................................................................................... 49

8.6.1 Method to determine the combined measurement uncertainty ....................................... 49

8.6.2 Determination of the combined measurement uncertainty I –PEMS validation ......... 49

8.6.3 Determination of the measurement uncertainty of the measurement II – RDE

measurement process ....................................................................................................................... 53

8.6.4 Calculation of the combined uncertainty of the measurement system (uMP) from the

individual uncertainty contributions .......................................................................................... 55

8.7 Calculation of the expanded measurement uncertainty ...................................................... 55

8.8 Consideration of the measurement uncertainty for the inspection decision ............... 56

8.8.1 General ................................................................................................................................................... 56

8.8.2 Consideration of the measurement uncertainty for single-side restricted

characteristic ....................................................................................................................................... 57

8.8.3 Consideration of the measurement uncertainty for the publication of the result ...... 57

---------------------- Page: 5 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)

Annex A (normative) Determination of the reference uncertainty of chassis dynos .............. 59

Annex B (normative) Procedure of linearity verification ................................................................. 60

Bibliography ....................................................................................................................................................... 62

---------------------- Page: 6 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
European foreword

This document (prEN 17507:2020) has been prepared by Technical Committee CEN/TC 301 “Road

vehicles”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN enquiry.
---------------------- Page: 7 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
Introduction

The intention of this document is to determine the measurement uncertainty of mobile vehicle exhaust

emission testing equipment (e.g. Portable Emissions Measurement Systems, PEMS) under consideration

of applicable legal requirements.
The specific aims include the following.

— To be able to validate PEMS systems (for gaseous and particle number emissions) under various

operating environments with the intention of predicting PEMS performance over the whole range of

conditions used. It focusses on light-duty-vehicle application and serves as a basis for assessing the

uncertainty of heavy-duty emission measurement equipment.

— To be able to evaluate the deviation of gaseous PEMS under various light-duty RDE test conditions

and heavy-duty PEMS test conditions against known analyser systems under standard laboratory

conditions for the specified gas, which is traceable to national or international primary standards.

— To be able to evaluate the deviation of Particle Number (PN) - PEMS under various light-duty RDE

test conditions and heavy-duty PEMS test conditions against a known analyser system under

standard laboratory conditions for the same sample, which is traceable to national or international

primary or secondary standards.

— To define the means for demonstrating that the PEMS equipment is stable and the measurement

quality is sufficient between PEMS equipment service intervals.

— To provide input to the development of future specifications and quantified information about

instrument and process accuracy to help improve the accuracy and robustness of PEMS systems and

on-road measurements.

— To set a framework for determining the PEMS measurement uncertainty and the uncertainty of RDE

measurements by analysing available data and providing a method for data evaluation.

In particular, the derivation of the uncertainty according to all parts of the document allows the following.

— The instrument measurement uncertainty can be evaluated.

— The RDE measurement uncertainty can be reported as a part of the measurement result following

DIN 1319-1:1995.

— The results of an investigation based on this standard provide information about the suitability of

the equipment for the intended use and provide a basis for the definition of conformity and non-

conformity criteria.

— Transparency with respect to the instrument measurement uncertainty of currently available

equipment.

— Transparency with respect to the measurement uncertainty of the testing processes, currently

established by vehicle manufacturers, technical services and type approval authorities (e.g. effects of

testing routine and route).

— Explanation and assessment of deviant measurement results of repetitive measurements with the

same vehicle / vehicle type.

— Explanation and assessment of deviant measurement results of the same vehicle / vehicle type when

tested by different parties.
---------------------- Page: 8 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
1 Scope

This document defines the procedures for assessing the performance of PEMS equipment, which is used

for the on-road measurement of tailpipe emissions of light-duty vehicles, on the basis of a common test

procedure that simulates the range of conditions experienced during on-road tests.

This document prescribes:
a) the tests to be conducted, and,

b) a procedure to determine, for any particular piece of PEMS equipment, an appropriate uncertainty

margin to reflect its performance over those conditions.
The key test variables are as follows (but not limited to the ones mentioned):
1) temperature, humidity and pressure and step-wise or gradual changes,
2) acceleration and deceleration (longitudinal and lateral),
3) vibration, inclination and shock tests,
4) instrument positioning on a vehicle,
5) combinations of (1) to (4),
6) cross-Interferences,
7) signal-processing, data treatment and time alignment, and
8) calculation methods (excluding the regulatory post-processing of data).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 27891:2015, Aerosol particle number concentration — Calibration of condensation particle counters

3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
inspection decision
result of an inspection
---------------------- Page: 9 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
3.1.2
inspection
inspection process

conformity evaluation by observation and judgement accompanied as appropriate by measurement,

testing or gauging
3.1.3
limit of error
maximum permissible error

extreme value of measurement error, with respect to a known reference quantity value, permitted by

specifications or regulations for a given measurement, measuring instrument, or measuring system

3.1.4
measurement standard

realization of the definition of a given quantity, with stated quantity value and associated measurement

uncertainty, used as a reference
3.1.5
measuring and test equipment

device used for making measurements, alone or in conjunction with one or more supplementary devices

3.1.6
measuring system

set of one or more measuring instruments and often other devices, including any reagent and supply,

assembled and adapted to give information used to generate measured quantity values within specified

intervals for quantities of specified kinds
3.1.7
measurement uncertainty

non-negative parameter characterizing the dispersion of the quantity values being attributed to a

measurand, based on the information used
3.1.8
uncertainty budget

statement of a measurement uncertainty, of the components of that measurement uncertainty, and of

their calculation and combination
3.2 Symbols and abbreviations
CLA Chemiluminescence analyser
CLD Chemiluminescence detector
PN Particle Number
EFM Exhaust flow meter
GMD Geometric mean mobility diameter
NDIR Non-dispersive infrared
NDUV Non-dispersive ultraviolet
PEMS Portable emission measuring systems
RDE Real-driving emissions
---------------------- Page: 10 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
SOC State of charge
PSD Power Spectral Density
GRR Gauge repeatability reproducability
GUM Guide to the Expression of Uncertainty in Measurement
k k-factor
MPE Maximum Permissible Error
USL Upper limit of specification
USL limit of detection of legally defined non-compliance
USL limit of detection of legally defined compliance
QMS/MP,Max Capability limit
QMS/MP Capability limit
R&R Repeatability and reproducibility
RE Resolution (of measurement system)
TOL Tolerance
uAV Uncertainty contribution of operator
uBi Uncertainty contribution of bias
uCAL Uncertainty contribution of calibration
uEVO Uncertainty contribution of repeatability at the object
uEVR Uncertainty contribution of Repeatability on standards
UIAI Uncertainty contribution of interdependence
uMP Uncertainty contribution by measurement procedure
UMP Extended measurement uncertainty contribution by measurement procedure
uMS Uncertaintly contribution by measurement system
UMS Extended measurement uncertainty contribution by measurement system
uRE Uncertainty contribution by resolution
LSL Lower limit of specification
VDE
VDI
VIM Vocabulary of Metrology (VIM)
4 Proposed document structure including requirements, responsibilities and
results

This document is structured according to Table 1. This table also includes recommendations, which party

should be responsible to conduct the tests and evaluate the uncertainty following the procedures which

are described in this standard.
---------------------- Page: 11 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
Table 1 — Document structure
Clause Requirement Responsibility Result
5.1 General requirements [boundary –- Defined boundary
conditions] on PEMS measurement conditions
systems [during RDE testing]
5.2 Gaseous analysers [Performance test PEMS Proof, that PEMS system
procedures] manufacturers component works under
defined boundary
5.3 Particle number analysers [Performance
conditions; boundary
test procedures]
conditions defined
5.4 Exhaust flow meter [Performance test
procedures]
5.5 GPS [Performance test procedures]
6 Uncertainty assessment of the individual PEMS Uncertainty contributions
components of PEMS manufacturers for each component
7 Theoretical PEMS measurement –-
uncertainty based on PEMS components
8 Evaluation of uncertainty of performance –- See below
testing
8.1 Overarching descriptions –-
8.2 RDE measurement process –- Defined process
8.3 Traceability of mobile exhaust emission PEMS PEMS Acceptance and
measurement systems manufacturers reverification
▪ Traceability to the national standard
1 calibration
▪ Testing the PEMS against reference gas
Recalibration
▪ Evaluation of the deviation from the
defined error limit (MPE: Maximum
Permissible Error)
▪ Round robin test
If the deviation is sufficiently small, then it
can be traced back.
8.4 Uncertainty of the measurement –- Understanding the
equipment (PEMS) in comparison to the procedure
measurement process (RDE measurement)
8.5 Uncertainty contributions on the –- Defined Uncertainty
inspection process (Ishikawa-Diagram) Contributions
8.6 Uncertainty evaluations Individual Combined measurement
PEMS User uncertainty of the PEMS
validation
8.7 Calculation of the expanded measurement PEMS User Combined measurement
uncertainty Community uncertainty of the RDE
inspection process;
---------------------- Page: 12 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
Clause Requirement Responsibility Result
8.7 Calculation of the expanded measurement –-
uncertainty
8.8 Consideration of the measurement Individual Measurement uncertainty
uncertainty for the inspection decision PEMS User of inspection decision
5 PEMS requirements and equipment
5.1 General requirements
5.1.1 Boundary conditions

PEMS are used in a wide range of conditions. Table 2 below gives the main parameters that should be

taken into account with their possible range according to the RDE procedure and their real range of

variation during a real test.
Table 2 — Parameters of the boundaries conditions
real range variation
Boundaries conditions RDE possible range
during test
+ or −10°C during one test
temperature −7°C to 35°C up to −30°C if soaked in a
garage
+1200m / 100km
altitude 0 to 1300m
as positive altitude gain
up to ± 150 hPa
pressure variation 850 to 1050 hPa (sea level)
variation during the test
5 % to 90 % non-condensing
humidity
relative humidity (RH)
vibrations See 5.1.5 See 5.1.5
duration of the test 1,5 to 2 h 1,5 to 2 h
5.1.2 Temperature

During the test, according to the real life, the vehicle can be soaked in a garage at 23°C and go outside

with a temperature at −7°C, the direct variation can be up to −30°C.

According to extreme atmospheric conditions and fact that the vehicle can climb a mountain, the variation

of temperature during the test can be negative (decrease of the temperature at the top of the mountain)

and positive (increase of the temperature at the bottom of the mountain).

A variation of −30°C and +12°C shall be considered during a test to check the impact of the measurement

accuracy and drift.
Examples of temperatures changes are given in the Figure 1.
---------------------- Page: 13 ----------------------
oSIST prEN 17507:2020
prEN 17507:2020 (E)
a) 23°C to −7°C
b) 23 °C to 35 °C
Figure 1 — Examples of temperatures changes in a climate chamber
NOTE The temperature changes from 23 °C to −7 °C is realized in around 20 min.
5.1.3 Altitude / Pressure

Table 3 shows the variation of pressure (in hPa or mBar) according to the atmospheric condition (vertical

variation) and the altitude (horizontal variation).
Table 3 — Variat
...