在测功机测试室中使用低温增压空气冷却器系统进行发动机测试

[中文适用范围]： 本 SAE 推荐实践中提出的方法适用于低温充气@风冷@重型柴油发动机的受控测试。本文档包含以下主要部分：相关参数的定义 b．车辆测试以确定这些参数的典型值 c．测试单元系统的设置和操作的描述 d．测试单元系统的验证测试虽然本文件中未涵盖，但车辆发动机冷却器系统的计算机建模被认为是确定冷却器系统性能的有效工具，并且可用于补充所描述的测试。然而，在将模型用于上述目的之前，应进行充分的车载测试来验证模型。该程序参考了美国环境保护署 (US EPA) 规定的且包含在联邦法规中的测试周期。公认存在其他可用于验证测试@的国际测试周期@。目的 - 本文档的主要目的是帮助设置和评估在测功机测试单元中与重型柴油发动机 (HDDE) 一起使用的低温增压空气冷却器系统。这些增压空气冷却器系统通常提供的冷却增压空气温度低于冷却系统后的水套水温度，但高于环境温度。低温增压空气冷却器系统的示例包括空对空后冷却系统和低流量冷却剂后冷却系统。虽然本文件涉及此类发动机@的排放评估，但并不限于该用途。 [外文原描述]： The methods presented in this SAE Recommended Practice apply to the controlled testing of low-temperature charge, air-cooled, heavy-duty diesel engines. This document encompasses the following main sections:aDefinitions of pertinent parametersbVehicle testing to determine typical values for these parameterscDescription of the setup and operation of the test cell systemdValidation testing of the test cell systemWhile not covered in this document, computer modeling of the vehicle engine cooler system is recognized as a valid tool to determine cooler system performance and could be utilized to supplement the testing described. However, adequate in-vehicle testing should be performed to validate the model before it is used for the purposes outlined.The procedure makes references to test cycles that are prescribed by the United States Environmental Protection Agency (US EPA) and are contained in the Code of Federal Regulations. The existence of other international test cycles, which can be used for validation testing, is acknowledged.Cross Reference: CFRTitle40,Part