本文件规定了使用烟度计评估压燃式发动机烟雾排放的测量程序和试验循环。试验在稳态和瞬态运行下进行，使用代表给定应用的试验循环。 烟度测试使用烟度计型烟度计进行，烟度计根据消光原理工作。本文件的目的是定义烟雾试验循环以及用于测量不透明度和测定光吸收系数的方法。它允许使用全流或分流烟度计，并校正两种烟度计之间上升时间的差异。 不透明度测量仪器的规格见ISO 11614。本文件中描述的试验程序和测量技术一般适用于往复式内燃机（RIC）。附录D、附录E、附录F和附录G各包含一个仅与该附录第一子条款中列出的特定应用相关的试验循环。在可能的情况下，附录中描述的烟雾试验循环使用ISO 8178-4中开发的发动机和机器类别。 对于某些类别的非道路发动机，“现场”而非“试验台”烟雾测试程序可能被证明是必要的。适用于附加要求（e。 g、 职业健康和安全法规），附加测试条件和特殊评估方法可适用。

This document specifies the measurement procedures and test cycles for the evaluation of smoke emissions from compression ignition engines using an opacimeter. The tests are carried out under steady-state and transient operation using tests cycles which are representative of a given application. The smoke testing is conducted using opacimeter-type smoke meters which operate on the light extinction principle. The purpose of this document is to define the smoke test cycles and the methods used to measure the opacity and for the determination of the light absorption coefficient. It allows the use of either full-flow or partial-flow opacimeters and corrects for differences in rise time between the two types of opacimeters. Specifications of the apparatus for the measurement of opacity can be found in ISO 11614. The test procedures and measurement techniques described in this document are applicable to reciprocating internal combustion (RIC) engines in general. Annex D, Annex E, Annex F and Annex G each contains a test cycle that is relevant only for those specific applications listed in the first subclause of that annex. Where possible, the smoke test cycle described in the annex utilizes the engine and machine categories developed in ISO 8178 4. For certain categories of non-road engines "at site" rather than "test bed" smoke test procedures can prove to be necessary. For engines used in machinery covered by additional requirements (e.g. occupational health and safety regulations), additional test conditions and special evaluation methods can apply.