ISO 17536-4:2019

INTERNATIONAL ISO
STANDARD 17536-4
First edition
2019-11
Road Vehicles — Aerosol separator
performance test for internal
combustion engines —
Part 4:
Laboratory fractional efficiency test
method
Véhicules Routiers — Essai de performance du séparateur d'aérosols
pour les moteurs à combustion interne —
Partie 4: Méthode d'essai de l'efficacité fractionnelle en laboratoire
Reference number
©
ISO 2019
© ISO 2019
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Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 2
4 Measurement accuracy . 2
5 Test materials and conditions . 2
5.1 Absolute filter, wall flow trap and leakage . 2
5.2 Test temperature . 2
5.3 Test conditions . 2
6 Test procedure . 3
6.1 General . 3
6.2 Test equipment . 3
6.3 Aerosol generator . 4
6.4 Aerosol sampling system . 4
6.5 Particle sizing and counting monitor(s) . 5
7 Apparatus qualification testing . 5
7.1 Test stand verification . 5
7.2 Concentration limit of the particle instrument . 6
7.3 100 % efficiency test and development of purge time . 6
7.4 Correlation test . 6
7.5 Test duct air leakage test . 6
7.6 Apparatus maintenance . 7
8 Fractional efficiency test . 7
8.1 General . 7
8.1.1 New state (if possible) . 7
8.1.2 Conditioned state as per ISO/TS 17536-2 . 7
8.2 Method . 7
8.3 Calculations . 7
8.4 Correlation and tare . 7
8.5 Fractional efficiency test . 8
9 Calculations and data acceptance criteria . 9
9.1 Symbols used in following formulae . 9
9.2 Symbols . 9
9.3 Subscripts used in the following formulae . 9
9.4 Average used in the following formulae . 9
9.5 Test sampling . . 9
9.6 Correlation ratio .11
9.7 Penetration / Fractional efficiency .12
9.8 Efficiency .12
9.9 Data reduction .12
9.9.1 Correlation ratio data reduction .12
9.9.2 Correlation ratio data acceptance criteria .15
9.9.3 Penetration data reduction .15
9.9.4 Penetration Data Acceptance Criteria .17
9.9.5 Penetration maximum background counts .18
9.9.6 Penetration minimum upstream counts .18
9.9.7 Efficiency .18
Annex A (normative) Poisson statistics .19
Annex B (informative) Aerosol separator laboratory fractional efficiency test report .21
Annex C (normative) Test equipment .23
Bibliography .25
iv © ISO 2019 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain and powertrain fluids.
A list of all parts in the ISO 17536 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
Introduction
Engine crankcase blowby is composed of combustion exhaust gases, which have escaped to the
crankcase via piston ring seals, and lube oil aerosols generated by thermal and mechanical action
within the engine. These gases are vented from the crankcase to prevent a build-up of high pressure.
The constituents of vented engine blowby gases are recognized as an undesirable contaminant and
technology for their containment is therefore evolving.
The device used to separate oil aerosols from the blowby typically releases cleaned gases to atmosphere
or into the air inlet prior to the engine or turbo compressor (if present). The latter has led to the
requirement for a pressure control device to isolate the engine from turbo inlet suction.
It is
...