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BS EN 17507:2021

BS EN 17507:2021

$215.11

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

Published By Publication Date Number of Pages
BSI 2021 88
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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:

  1. the tests to be conducted, and

  2. 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):

  1. temperature, humidity and pressure (including 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 (a) to (d),

  6. cross-interferences,

  7. signal-processing, data treatment and time alignment, and

  8. calculation methods (excluding the regulatory post-processing of data).

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
10 3.2 Symbols and abbreviations
13 3.3 List of subscripts
4 Document structure including requirements, responsibilities and results
14 5 On-road testing process using PEMS
16 6 PEMS requirements and specifications
6.1 General requirements
6.1.1 General
6.1.2 Boundary conditions
6.1.3 Temperature
6.1.4 Altitude / Pressure
17 6.1.5 Humidity
6.2 Auxiliary equipment
6.3 Global Navigation Satellite System
6.4 Exhaust gas parameters
6.4.1 Exhaust flow meter
6.4.1.1 General
18 6.4.1.2 Specification
6.4.1.3 Linearity
6.4.1.4 Calibration and verification standards
6.4.1.5 Frequency of verification
6.4.1.6 Accuracy
6.4.1.7 Precision
6.4.1.8 Noise
6.4.1.9 Zero response drift
19 6.4.1.10 Span response drift
6.4.1.11 Rise time
6.4.1.12 Response time check
6.5 General requirements for gas analysers
6.5.1 Permissible types of analysers
6.5.1.1 Standard analysers
6.5.1.2 Alternative analysers
20 6.5.2 Analyser specifications
6.5.2.1 General
6.5.2.2 Linearity of analysers
6.5.2.3 Accuracy
6.5.2.4 Precision
6.5.2.5 Noise
6.5.2.6 Zero response drift
6.5.2.7 Span response drift
21 6.5.2.8 Rise time
6.5.2.9 Gas drying
6.5.2.10 Additional requirements
6.5.3 Response time check of the analytical system
6.6 Analysers for measuring (solid) particle emissions (particle number)
6.6.1 General
6.6.2 Efficiency requirements
22 6.6.3 Linearity requirements
23 6.6.4 Volatile removal efficiency
6.6.5 Zero response drift
6.6.6 Span response drift
7 PEMS Performance testing
7.1 Uncertainty assessment for PEMS performance testing according to GUM
24 7.2 General requirements
7.2.1 Vibration and shock tests
7.2.2 PEMS battery voltage test
7.2.2.1 General
7.2.2.2 Method A: Using a Power Supply Unit (PSU) with a Controllable Voltage
25 7.2.2.3 Method B: Using a Battery (or Batteries if specified by the PEMS manufacturer)
26 7.3 Gaseous analysers
7.3.1 General requirements and prerequisites on the performance testing of a gaseous PEMS
27 7.3.2 Performance test execution, test matrix and test setup
7.3.2.1 Performance test execution
7.3.2.2 Performance test matrix overview
29 7.3.3 Tests
7.3.3.1 Vibration and shock tests
31 7.3.3.2 Inclination tests
7.3.3.3 Ambient temperature and humidity tests and step changes
33 7.3.3.4 Ambient pressure tests
34 7.4 Particle number analysers
7.4.1 General
35 7.4.2 Setup for vibration and shock tests
36 7.4.3 Setup for ambient humidity and ambient temperature variation tests
37 7.4.4 Setup for pressure tests
7.4.4.1 For polydisperse aerosol
39 7.4.4.2 For monodisperse aerosol
40 7.4.5 Setup for sample humidity tests
41 7.4.6 Outline Procedures
43 7.4.7 Tests
7.4.7.1 Vibration and shock tests
7.4.7.2 Inclination tests
44 7.4.7.3 Ambient temperature and humidity tests and step changes
7.4.7.4 Ambient pressure tests
45 7.4.7.5 Sample gas humidity variation tests
7.5 Exhaust mass flow meter (EFM)
7.5.1 General requirement
46 7.5.2 PEMS installation
7.5.3 Data analysis
7.6 Global Navigation Satellite System (distance measurement)
47 8 Motivation and methods for uncertainty evaluation
8.1 Alpha and Beta-Error
48 8.2 Transfer to emission testing
49 8.3 Measurement uncertainty as part of the measurement result
8.4 Methods for uncertainty evaluation (GUM type A and B)
50 9 Uncertainty evaluation of PEMS measurements (Type A – experimentally)
9.1 Measurement uncertainty during PEMS validation and on-road conditions
51 9.2 Uncertainty contributions on the testing process (Ishikawa-Diagram)
9.2.1 General
53 9.2.2 Measurement system
9.2.2.1 PEMS type
9.2.2.2 Set-up of the PEMS
9.2.2.3 Reference system
9.2.2.4 Linearity error
9.2.3 Measurement object (vehicle emission)
9.2.4 Measurement method
9.2.4.1 Measurement phase
54 9.2.5 Operator
9.2.6 Environment
9.2.6.1 Weather conditions
9.2.6.2 Temperature
9.2.6.3 Test route
9.2.6.4 Vibration
9.3 Determination of the combined measurement uncertainty I – PEMS validation
9.3.1 General
55 9.3.2 Uncertainty of the reference value (calibration of reference, uCAL)
56 9.3.3 Repeatability at the standard (PEMS validation, uEVR)
57 9.3.4 Uncertainty from systematic deviation (Bias uBi)
9.3.5 Combined uncertainty of the measuring system (uMS)
58 9.3.6 Influence of the measurement object on the measurement system
9.4 Determination of the combined measurement uncertainty II – PEMS on board
9.4.1 General
59 9.4.2 Repeatability of on-road measurement (uEVO)
60 9.4.3 Effect of the measurement object (vehicle emissions) on the PEMS
9.4.4 Effect of the test route
9.4.5 Influence of weather conditions (especially ambient temperature)
9.4.6 Effect of the test phases (urban, rural, highway)
61 9.4.7 Combined uncertainty of the measuring process (uMP,road)
9.4.8 Combined uncertainty of the measuring process if a reference system is available for the on-road measurement (uMP)
62 10 Uncertainty evaluation of on-road testing (Type B – non experimentally)
10.1 General
63 10.2 Calculation of the combined uncertainty of the individual mass mi.
10.3 Calculation of combined uncertainty of total mass M (u∑m)
65 10.4 Evaluation of covariance to calculate the combined uncertainty of M
67 10.5 Sources of uncertainty, weight (ω) and LO value (γ)
10.5.1 General
68 10.5.2 Sources of uncertainty, weight (ω) and LO value (γ) for concentration measurement (gas analysers)
75 10.5.3 Sources of uncertainty, weight (ω) and LO value (γ) for flow measurement (EFM)
76 10.6 Systematic error uΔM due to dynamics and time alignment error Δi
77 10.7 Uncertainty of the emission measurement UE
79 Annex A (normative)Procedure of linearity verification
A.1 General requirements
A.2 General procedure
81 Annex B (normative)Additional requirements for gas analysers
B.1 CO/CO2 analysers
B.1.1 CO analyser interference check
B.2 NO/NO2 analysers
B.2.1 Efficiency test for NOx converters
82 B.2.2 CLD analyser quench check
84 B.2.3 Sample dryer
B.2.4 Sample dryer NO2 penetration
85 B.2.5 Quench check for NDUV analysers
86 Annex C (normative)Determination of the reference uncertainty of chassis dynos uCAL

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BS EN 17507:2021
$215.11