本文件涵盖了用于确定重型卡车和公共汽车上使用的发动机驱动液压泵的功耗特性的评估技术。本SAE推荐实施规程中概述的测试技术是作为测试和评估重型卡车和公共汽车燃料消耗的总体计划的一部分而开发的。本文件中概述的技术描述了为确定这些发动机驱动部件的功耗而进行的测试，SAE J745中讨论了执行这些测试通常需要的设备和设施的类型。建议在特定车辆操作的实际数据基础上仔细审查整个测试中建议的特定操作条件。

This document covers evaluation techniques for determining the power consumption characteristics of engine driven hydraulic pumps used on heavy-duty trucks and buses. The testing technique outlined in this SAE Recommended Practice was developed as part of an overall program for testing and evaluating fuel consumption of heavy-duty trucks and buses. The technique outlined in this document provides a description of the test to be run to determine power consumption of these engine driven components, the type of equipment and facilities which are generally required to perform these tests are discussed in SAE J745. It is recommended that the specific operating conditions suggested throughout the test be carefully reviewed on the basis of actual data obtained on the specific vehicle operation.