本SAE推荐实施规程规定了用于在固定条件下测量乘用车、多用途车辆和轻型卡车外部排气声级的测试程序、环境和仪器，提供了在发动机转速或模拟发动机转速范围内连续测量排气系统或模拟排气声级的方法。本文件仅适用于配备内燃机或外部音响系统的道路车辆。该方法旨在满足简单性要求，只要它们与车辆运行条件下结果的再现性一致。测量静止A在本文件的范围内- 期间的加权声压级:制造阶段的测量官方测试站的测量路边测试的测量它既没有规定当发动机在实际负载下运行时检查排气声压级的方法，也没有规定根据道路车辆类别的一般噪声限值检查排气声压级的方法。它提供了检测排气系统共振的方法，可能会影响外部和内部音质。SAE J2805提供了在实际车辆负载和速度下评估车辆噪声排放与在用车辆噪声排放一致的方法。本文件包含ISO 5130的某些规定: 2019，用于测量排气系统的声级（见附录A）。

This SAE Recommended Practice establishes the test procedure, environment, and instrumentation to be used for measuring the exterior exhaust sound level for passenger cars, multipurpose vehicles, and light trucks under stationary conditions providing a continuous measure of exhaust system or simulated exhaust sound level over a range of engine speeds or simulated engine speeds.This document applies only to road vehicles equipped with an internal combustion engine or with an external sound system.The method is designed to meet the requirements of simplicity as far as they are consistent with reproducibility of results under the operating conditions of the vehicle.It is within the scope of this document to measure the stationary A-weighted sound pressure level during:Measurements at the manufacturing stageMeasurements at official testing stationsMeasurements at roadside testingIt does neither specify a method to check the exhaust sound pressure level when the engine is operated at realistic load nor a method to check the exhaust sound pressure levels against a general noise limit for categories of road vehicles. It provides the means for detecting exhaust system resonances with the potential to affect both exterior and interior sound quality.SAE J2805 provides methods to assess vehicle noise emission consistent with in-use vehicle noise emissions at realistic vehicle loads and speeds.This document incorporates certain provisions of ISO 5130:2019 for measuring the sound level of exhaust systems (seeAppendix A).