本SAE推荐实施规程规定了评估通常小于20 kW的小型公用事业发动机气体排放的统一程序。发动机试验设置和废气分析技术的详细说明旨在提供统一且可重复的测量方法。其目的是在实验装置的物理结构上尽可能地灵活。因此，仅详细规定了仪器的操作对准确测量排放水平至关重要的部分。概述了包括试验顺序在内的发动机试验程序，以便涵盖使用小型发动机的各种应用。其目的是了解废气排放水平，并不意味着在给定应用中，发动机将在试验程序中概述的所有模式下运行。 本文件旨在作为标准实践的指南，并可根据经验和技术进步进行更改。

This SAE Recommended Practice specifies a uniform procedure for the evaluation of gaseous exhaust emissions from small utility engines typically less than 20 kW. Details of engine test setup and exhaust gas analysis techniques are specified with the intent of providing a uniform and reproducible method of measurement.The intent has been to allow as much flexibility as possible in the physical construction of the experimental apparatus. Therefore, only those portions of the apparatus whose operation is critical to the accurate measurement of emissions levels are prescribed in detail.An engine test procedure including a test sequence is outlined such that it would cover the various applications in which small engines are used. The intent is to provide an understanding of the levels of exhaust emissions and does not imply that in given application, an engine would operate in all the modes outlined in the test procedure.This document is intended as a guide toward standard practice and is subject to change to keep pace with experience and technical advances.