Road Vehicles - Portable Emission Measuring Systems (PEMS) - Performance Assessment

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).

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 PEMS 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 :
a) les essais à réaliser et,
b) une procédure permettant de déterminer, pour tout élément 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 :
1) température, humidité et pression et variations échelonnées ou progressives,
2) accélération et décélération (longitudinale et latérale),
3) essai de vibration, d'inclinaison et de choc,
4) positionnement de l'instrument sur un véhicule,
5) combinaisons de (1) et (4),
6) brouillage réciproque,
7) traitement des signaux, traitement des données et alignement temporel, et
8) méthodes de calcul (sauf traitement ultérieur réglementaire des données).

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

General Information

Status
Published
Public Enquiry End Date
22-Jul-2020
Publication Date
22-Sep-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
22-Sep-2021
Due Date
27-Nov-2021
Completion Date
23-Sep-2021

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SLOVENSKI STANDARD
SIST EN 17507:2021
01-november-2021
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: EN 17507:2021
ICS:
43.180 Diagnostična, vdrževalna in Diagnostic, maintenance and
preskusna oprema test equipment
SIST EN 17507:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17507:2021

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SIST EN 17507:2021


EN 17507
EUROPEAN STANDARD

NORME EUROPÉENNE

September 2021
EUROPÄISCHE NORM
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 European Standard was approved by CEN on 11 July 2021.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists 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.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17507:2021 E
worldwide for CEN national Members.

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SIST EN 17507:2021
EN 17507:2021 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols . 6
3.1 Terms and definitions . 6
3.2 Symbols and abbreviations . 8
3.3 List of subscripts . 11
4 Document structure including requirements, responsibilities and results . 11
5 On-road testing process using PEMS . 12
6 PEMS requirements and specifications . 14
6.1 General requirements . 14
6.2 Auxiliary equipment . 15
6.3 Global Navigation Satellite System . 15
6.4 Exhaust gas parameters . 15
6.5 General requirements for gas analysers . 17
6.6 Analysers for measuring (solid) particle emissions (particle number) . 19
7 PEMS Performance testing . 21
7.1 Uncertainty assessment for PEMS performance testing according to GUM . 21
7.2 General requirements . 22
7.3 Gaseous analysers . 24
7.4 Particle number analysers . 32
7.5 Exhaust mass flow meter (EFM) . 43
7.6 Global Navigation Satellite System (distance measurement) . 44
8 Motivation and methods for uncertainty evaluation . 45
8.1 Alpha and Beta-Error . 45
8.2 Transfer to emission testing . 46
8.3 Measurement uncertainty as part of the measurement result . 47
8.4 Methods for uncertainty evaluation (GUM type A and B) . 47
9 Uncertainty evaluation of PEMS measurements (Type A – experimentally) . 48
9.1 Measurement uncertainty during PEMS validation and on-road conditions . 48
9.2 Uncertainty contributions on the testing process (Ishikawa-Diagram) . 49
9.3 Determination of the combined measurement uncertainty I - PEMS validation . 52
9.4 Determination of the combined measurement uncertainty II – PEMS on board . 56
10 Uncertainty evaluation of on-road testing (Type B – non experimentally) . 60
10.1 General. 60
10.2 Calculation of the combined uncertainty of the individual mass m . . 61
i
10.3 Calculation of combined uncertainty of total mass M (u∑m) . 61
10.4 Evaluation of covariance to calculate the combined uncertainty of M . 63
10.5 Sources of uncertainty, weight (ω) and LO value (γ) . 65
10.6 Systematic error u due to dynamics and time alignment error Δi . 74
ΔM
10.7 Uncertainty of the emission measurement U . 75
E
2

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EN 17507:2021 (E)
Annex A (normative) Procedure of linearity verification . 77
Annex B (normative) Additional requirements for gas analysers . 79
Annex C (normative) Determination of the reference uncertainty of chassis dynos u . 84
CAL
Bibliography . 85

3

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SIST EN 17507:2021
EN 17507:2021 (E)

European foreword
This document (EN 17507:2021) has been prepared by Technical Committee CEN/TC 301 “Road
vehicles”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2022, and conflicting national standards shall be
withdrawn at the latest March 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
4

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SIST EN 17507:2021
EN 17507:2021 (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 (e.g. European Legislation on Light-Duty Real Driving Emission
measurement, RDE).
The specific aims include the following:
— To be able to assess PEMS (for gaseous and particle number emissions) under various operating
environments with the intention of predicting PEMS performance and uncertainty over the whole
range of conditions used. For the time being, it focusses on light-duty-vehicle application and serves
as a basis for assessing the uncertainty of heavy-duty emission measurement using PEMS.
— To be able to evaluate the deviation of gaseous PEMS under various light-duty on-road 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 on-
road 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 measurement uncertainty 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 instrument measurement uncertainty on-road can be reported as a part of the measurement
result following ISO 10012:2003.
— The results of an investigation based on this document provides information about the suitability of
the equipment for the intended use.
— Transparency with respect to the instrument measurement uncertainty of currently available
equipment.
— Transparency with respect to the testing processes for the measurement uncertainty.
— Assessment of the statistical significance of the difference of measurement results.
5

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SIST EN 17507:2021
EN 17507:2021 (E)

1 Scope
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 (including 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 (a) to (d),
f) cross-interferences,
g) signal-processing, data treatment and time alignment, and
h) 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.
EN ISO 29463 (all parts), High-efficiency filters and filter media for removing particles in air (ISO 29463
(all parts))
ISO 27891:2015, Aerosol particle number concentration - Calibration of condensation particle counters
ISO/IEC Guide 98-3:2008, Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
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 https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
6

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SIST EN 17507:2021
EN 17507:2021 (E)
3.1.1
analyser
component of a Measurement Module(s) for detecting the gaseous or particle emission concentrations
Note 1 to entry: The type is defined by the specific analyser model and the applied analytical principle or the
combination of multiple analytical principles.
3.1.2
filtered air
air filtered with a high efficiency filter according to EN ISO 29463-1, class 35H
3.1.3
inspection decision
result of an inspection
3.1.4
inspection
inspection process
conformity evaluation by observation and judgement accompanied as appropriate by measurement,
testing or gauging
3.1.5
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
3.1.6
measurement standard
realization of the definition of a given quantity, with stated quantity value and associated measurement
uncertainty, used as a reference
3.1.7
measuring and test equipment
device used for making measurements, alone or in conjunction with one or more supplementary devices
3.1.8
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
3.1.9
measurement uncertainty
non-negative parameter characterizing the dispersion of the quantity values being attributed to a
measurand, based on the information used
3.1.10
module
discrete or integrated sub-component within a PEMS, which supports the analyser(s) with the necessary
supplementary components to fulfil the necessary requirements for each pollutant being measured
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EN 17507:2021 (E)

3.1.11
Portable Emission Measurement System
PEMS
system that can measure exhaust emissions from a vehicle on the road, allowing real-world testing
Note 1 to entry: For regulatory purposes, a PEMS comprises all the components necessary to monitor, process and
report the real-driving emissions of the regulated pollutants in accordance with the relevant regulation. The PEMS
used for emissions regulatory purposes typically integrate Measurement Module(s) (for example, for gaseous,
particulate and exhaust-mass-flow). Additional accessories to fulfil the regulatory monitoring and processing
functions are also included (for example, a weather station, Global Navigation Satellite System (GNSS) and, if
required, connection to the vehicle networks).
3.1.12
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
A Accuracy
c concentration
CLD Chemiluminescence Detector
CPC Condensation Particle Counter
D Drift
d distance or diameter
DMA Differential Mobility Analyser
E Specific mass emission
ECU Engine Control Unit
EFM Exhaust Flow Meter
FS Full Scale
GMD Geometric Mean Mobility Diameter
GRR Gauge Repeatability Reproducibility
GSD Geometric Standard Deviation
GUM Guide to the Expression of Uncertainty in Measurement
i index
k k-factor
LSL Lower Limit of Specification
8

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SIST EN 17507:2021
EN 17507:2021 (E)
m mass
MFC Mass Flow Controller
MPE Maximum Permissible Error
NDIR Non-Dispersive Infra-Red
NDUV Non-dispersive Ultra Violet
NMC Non-Methane Cutter
NMHC Non-Methane Hydrocarbons
p pressure
P Precision
PAS Photoacoustic Spectroscopy
PEMS Portable Emission Measurement Systems
PMP Particle Measurement Programme
PN Particle Number from exhaust emission according to relevant legal definition
PSD Power Spectral Density
PSU Power Supply Unit
Q flow
R&R Repeatability and Reproducibility
RDE Real Driving Emissions
RE Resolution (of measurement system)
RH Relative Humidity
SOC State of Charge
T Temperature
t time at end of test
e
t time
TOL Tolerance
u uncertainty
u Uncertainty contribution of operator
AV
u Uncertainty contribution of bias
Bi
9

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SIST EN 17507:2021
EN 17507:2021 (E)

u Uncertainty contribution of calibration
CAL
u Uncertainty contribution of repeatability at the object
EVO
u Uncertainty contribution of repeatability on standards
EVR
U Uncertainty contribution of interdependence
IAI
u Uncertainty contribution by measurement procedure
MP
U Extended measurement uncertainty contribution by measurement procedure
MP
u Uncertainty contribution by measurement system
MS
U Extended measurement uncertainty contribution by measurement system
MS
u Uncertainty contribution by resolution
RE
USL Upper Limit of Specification
VDE Verband der Elektrotechnik, Elektronik und Informationstechnik (Association for
Electrical, Electronic & Information Technologies)
VDI Verein Deutscher Ingenieure (Association of German Engineers)
VIM Vocabulary of Metrology
VPR Volatile Particle Remover
Δc Concentration offset
Δt Test duration
e
Δt Time offset
Sensor or monitoring device for indicated entity (e.g. temperature sensor)

Controlling device for indicated entity (e.g. pressure controller or release valve)

10

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SIST EN 17507:2021
EN 17507:2021 (E)
3.3 List of subscripts
act actual value (value that would be displayed by a perfect instrument)
amb ambient, referring to ambient conditions
cur current value
drift concerning drift
err error
gas gas
i index
j index
m mass (e.g. for flow)
meas measured value
mono monodisperse
poly polydisperse
rd relative density
ref reference, referring to values of a reference device (if used)
s sample
set set value
span span
T Test duration
true true value
V Volume
zero zero
4 Document structure including requirements, responsibilities and results
The whole document is structured according to the following table. 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 document.
11

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SIST EN 17507:2021
EN 17507:2021 (E)

Table 1 — Document structure
# Requirement Responsible Result
party
5 On-road testing process using PEMS --- ---
6 PEMS requirements and specifications of PEMS PEMS technical specifications and
PEMS manufacturers test procedures for each type of
PEMS component under ideal
laboratory conditions
7 PEMS performance testing PEMS PEMS performance test procedure
manufacturers for the evaluation of each type of
PEMS component under simulated
boundary conditions of use
(in the laboratory)
8 Motivation and methods for uncertainty --- ---
evaluation
9 Uncertainty evaluation of on-road testing --- ---
(Type A – experimentally)
9.3
Determination of the combined Individual PEMS Combined measurement
measurement uncertainty I – PEMS User uncertainty of the PEMS
validation validation
9.4 Determination of the measurement PEMS User Combined measurement
uncertainty of the measurement II – Community uncertainty of the on-road
measurement process
on-road measurement process
10 Uncertainty evaluation of on-road testing Individual PEMS Combined measurement
User uncertainty of the PEMS validation
(Type B – non experimentally)
5 On-road testing process using PEMS
The basis for this document is a common understanding of the on-road inspection process including all
influencing parameters. The general description of the test procedure is defined in the relevant
regulations. However, the following process chart (Figure 1) summarizes the most important steps.
12

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SIST EN 17507:2021
EN 17507:2021 (E)

Key
1 vehicle and equipment set-up 3b on-road test (e.g. RDE test) consisting of
multiple phases (e.g. A, B, C, D)
2a pre-test; consisting of leak check, PN zero check, 3c post-test; similar to 2c
zero calibration, span calibration, EFM-function
check
2b validation test 4 evaluation of results
2c post-test; consisting of PN zero check, zero drift 5 results of test, power specific or distance
check (relative to pre-test), span drift check (relative specific mass emissions
to pre-test)
3a pre-test; similar to 2a S soak time of the vehicle (typically) between 6 to
56h, PEMS stays installed on the vehicle
Figure 1 — Example of general on-road measurement process (based on the European
Legislation on Light-Duty Real Driving Emission measurement, RDE)
The final result of the exhaust emission measurement is the distance specific mass of an emission
component limited by the relevant regulations. These results are given in the unit g/km or mg/km for
gaseous species, or in the unit 1/km for particle number for light-duty vehicles. Therefore, the
uncertainty has to be derived with respect to these final values.
As the applicable testing scheme may vary due to legally defined procedures, this process is taken as a
minimum reference for the description of errors, their dependencies and propagation. If the testing
procedure does significantly deviate from this process, the approach of uncertainty assessment shall be
reassessed accordingly based on the recommendations of this document.
13

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SIST EN 17507:2021
EN 17507:2021 (E)

6 PEMS requirements and specifications
6.1 General requirements
6.1.1 General
The technical requirements in this Clause are based on PEMS capabilities at the time of writing of this
document. It is up to the instrument manufacturer to prove the compliance to relevant legal requirements
or to prove an even better performance (lower uncertainty) for a specific analyser type, based on
appropriate testing and statistical methods.
6.1.2 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 on-road procedure and their real range of
variation during a real test.
Table 2 — Parameters of the boundary conditions
Possible range for on- Possible variation during
Boundary conditions
road testing single test
± 12 °C during one test
Temperature - 7 °C to 35 °C up to - 30 °C if soaked in a
garage
+ 1 200 m / 100 km
Altitude 0 m to 1 300 m
as positive altitude gain
850 hPa to 1 050 hPa (sea up to ± 150 hPa
Pressure
level) variation during the test
Humidity 5 % to 90 % non-condensing relative humidity (RH)
Vibrations See 7.2.1 See 7.2.1
Duration of the test 1,5 h to 2 h 1,5 h to 2 h
6.1.3 Temperature
During the test, according to the real life, the vehicle with the installed measurement equipment 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 the 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.
6.1.4 Altitude / Pressure
To cover applicable altitudes between sea level and 1 300 m above sea level under various atmospheric
conditions the pressure during the test can show negative gradients (climbing during test) or positive
gradients (increase of pressure at sea level).
The testing range is therefore defined as starting from 1 013 mbar (± 5 %) and reaching < 850 mbar and
at least 150 mbar less than the starting point. Based on a duration of an on-road measurement of 2 h and
a closed route, the gradient shall be at least 75 hPa/h.
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EN 17507:2021 (E)
6.1.5 Humidity
The range of humidity shall be checked for each pollutant taking into account the analyser technology.
The impact on its performance (e.g. interference, drift, correction) shall be identified. The main variation
in terms of hygrometry is linked to the exhaust gas humidity concentration for the analyser.
During the engine start, condensation may occur in the exhaust pipe line and exhaust gases are of low
humidity. Depending on the fuel and the combustion process, the relative humidity of the exhaust gas
may also reach up to 35 %. The ambient humidity however, can vary according to Table 1.
6.2 Auxiliary equipment
Auxiliary equipment includes sensors like the ones used for determination of ambient temperature,
ambient pressure, ambient humidity and or, if applicable, according values from the vehicles cabin.
Accuracy requirements for measurement parameters
Measurement parameter MPE value
Temperatures ≤ 600 K ± 2 K absolute
Temperatures > 600 K ± 0,4 % of reading in Kelvin
Ambient pressure ± 0,2 kPa absolute
Relative humidity ± 5 % absolute
Absolute humidity ± 10 % of reading or, 1 gH O/kg dry air,
2
whichever is larger
6.3 Global Navigation Satellite System
Global Navigation Satellite Systems (for example a Global Positioning System) receivers used in the PEMS
should meet, or exceed, the specifications as defined in the Global Positioning System Standard
Positioning Service Performance Standard (5th edition, Table 3.8.3, April 2020) or any other similar
standard. All Global Navigation Satellite Systems receivers used shall be supported with the receiver
manufacturer information stating clear and unambiguous compliance to the related standard.
6.4 Exhaust gas parameters
6.4.1 Exhaust flow meter
6.4.1.1 General
The determination of the exhaust mass flow is critical for the calculation of the distance specific emission
mass of a vehicle. Therefore, it is required that the signals used for the calculation of the mass flow are of
the best available quality. The sensitivity of instruments, sensors and signals to shocks, vibration, aging,
variability in temperature, ambient air pressure, electromagnetic interferences an
...

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.

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oSIST prEN 17507:2020

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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,
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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.

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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
2
6.6.1 General. 33
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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
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Annex A (normative) Determination of the reference uncertainty of chassis dynos . 59
Annex B (normative) Procedure of linearity verification . 60
Bibliography . 62

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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.
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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.
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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
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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
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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
L
USL limit of detection of legally defined compliance
M
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.
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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
st
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;
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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.
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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
...

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