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SAE J1492 (OCT2021)

Historical Revision

Measurement of Light Vehicle Stationary Exhaust System Sound Level Engine Speed Sweep Method

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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 sound level over a range of engine speeds. This document applies only to road vehicles equipped with an internal combustion engine. 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 stage Measurements at official testing stations Measurements at roadside testing It 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 (see Appendix A ).

SDO SAE: SAE International
Document Number J1492
Publication Date Oct. 28, 2021
Language en - English
Page Count 12
Revision Level 202110
Supercedes
Committee
Publish Date Document Id Type View
Nov. 1, 2023 J1492_202311 Revision
Oct. 28, 2021 J1492_202110 Revision
Oct. 27, 2008 J1492_200810 Revision
May 1, 1998 J1492_199805 Revision
March 1, 1992 J1492_199203 Revision