根据美国GHG和CAFE法规，制造商需要进行确认性测试以验证间接空调信用（参见40 CFR 86.1868-12）。本SAE推荐实践的目的是为制造商提供2020年及以后车型年的更新标准。本SAE推荐实践也适用于向加州空气资源委员会(CARB)报告信用使用和工程分析。 本SAE推荐实践描述了IMAC GHG CRP为开发测试程序、发布SAE标准和确定性能要求所做的工作，以从预先批准的信用菜单中证明空调技术的性能符合法规要求。 此外，本SAE推荐实践中还包含了车辆制造商在建立工程分析时可以使用的说明，以代替在不包含信用的车辆上执行AC17测试-生成技术。这些执行工程分析的程序应足以满足法规的要求，以便从预先批准的信用菜单中获得间接空调技术的信用。

Under U.S. GHG and CAFE regulations, manufacturers are required to perform confirmatory testing to validate indirect air conditioning credits (refer to 40 CFR 86.1868-12). The purpose of this SAE Recommended Practice is to provide manufacturers with updated criteria for the 2020 and later model years. This SAE Recommended Practice is also suitable for reporting credit using and Engineering Analysis to the California Air Resources Board (CARB). This SAE Recommended Practice describes the work done by the IMAC GHG CRP to develop test procedures, publish SAE Standards, and determine performance requirements to demonstrate the performance of A/C technologies from the pre-approved credit menu meeting regulatory requirements. Also, enclosed in this SAE Recommended Practice are instructions that can be used by vehicle manufacturers in establishing an engineering analysis in lieu of performing the AC17 test on a vehicle which does not incorporate the credit-generating technologies. These procedures for performing an engineering analysis should be sufficient to satisfy the requirements of the regulation to earn credits for indirect A/C technologies from the pre-approved credit menu.