ISO 8178-4:2020 pdf download

ISO 8178-4:2020 pdf download.Reciprocating internal combustion engines — Exhaust emission measurement
1 Scope
This document specifies the test cycles, the test procedures and the evaluation of gaseous and particulate exhaust emissions from reciprocating internal combustion (RIC) engines coupled to a dynamometer. With certain restrictions, this document can also be used for measurements at site. The tests are carried out under steady-state and transient operation using test cycles which are representative of given applications. This document is applicable to RIC engines for mobile, transportable and stationary use, excluding engines for on-road transport of passengers and goods. It can be applied to engines for non-road use, e.g. for earth-moving machines, generating sets and for other applications. For engines used in machinery covered by additional requirements (e.g. occupational health and safety regulations, regulations for power plants), additional test conditions and special evaluation methods can apply.
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 8178-1:2020, Reciprocating internal combustion engines — Exhaust emission measurement — Part 1:Test-bed measurement of gaseous and particulate exhaust emissions
ISO 8178-5, Reciprocating internal combustion engines — Exhaust emission measurement — Part 5:Test fuels
ASTM E29–06b, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
3 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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 adjustment factors
additive (upward adjustment factor and downward adjustment factor) or multiplicative factors to be used for engines equipped with emission controls, that are regenerated on an infrequent (periodic) basis
3.2 applicable emission limit
emission limit to which an engine is subject
3.3 aqueous condensation
precipitation of water-containing constituents from a gas phase to a liquid phase
Note 1 to entry: Aqueous condensation is a function of humidity, pressure, temperature, and concentrations of other constituents such as sulphuric acid. These parameters vary as a function of engine intake-air humidity,dilution-air humidity, engine air-to-fuel ratio, and fuel composition — including the amount of hydrogen and sulphur in the fuel.
3.4 atmospheric pressure
wet, absolute, atmospheric static pressure
Note 1 to entry: If the atmospheric pressure is measured in a duct, negligible pressure losses shall be ensured between the atmosphere and the measurement location, and changes in the duct’s static pressure resulting from the flow shall be accounted for.