1.1 本实验室试验方法涵盖了根据研究O.N.对液体火花点火式发动机燃料爆震等级的定量测定，包括含有高达25 % v/v的乙醇。然而，该试验方法可能不适用于主要为含氧化合物的燃料和燃料组件。 2. 样品燃料使用标准化的单缸、四冲程循环、可变压缩比、化油器、CFR发动机根据规定的一组操作条件进行测试。 O.N.刻度由PRF混合物的体积组成定义。将样品燃料爆震强度与一种或多种PRF混合物的爆震强度进行比较。与样品燃料的K.I.相匹配的PRF混合物的O.N.确定了研究O.N。 1.2 辛烷值范围为0至120辛烷值，但本试验方法的工作范围为40至120研究辛烷值。为火花点火式发动机生产的典型商业燃料的辛烷值范围在88至101研究辛烷值范围内。对汽油混合原料或其他工艺流材料的测试可以在整个研究O中产生不同级别的评级。 N.范围。 1.3 操作条件的值以国际单位制表示，并被视为标准。括号中的值是历史上的英寸-磅单位。标准化CFR发动机测量仍然以英寸-磅为单位，只是因为为该设备创建了大量且昂贵的工具。 1.4 为了确定是否符合本标准中所有规定的限值，观测值或计算值应四舍五入到最后一位的“最接近的单位”- 根据实践中的四舍五入方法，用于表示指定极限的手数字 E29 。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体警告说明，请参阅第节 8. ， 14.4.1 ， 15.5.1 ， 16.6.1 ， 附件A1 ， A2.2.3.1 ， A2。 2.3.3 ( 6. )以及( 9 )， A2.3.5 ， X3.3.7 ， X4.2.3.1 ， X4.3.4.1 ， X4.3.9.3 ， X4.3.11.4 和 X4.5.1.8 。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 研究O.N.与商用汽车火花的相关性- 点火发动机在温和操作条件下的抗爆性能。 5.2 发动机制造商、炼油商和营销人员使用研究O.N.，并在商业中作为与燃料和发动机匹配相关的主要规格测量。 5.2.1 允许计算汽车抗爆性能的经验相关性基于一般方程: 的值 k 1. ， k 2. 和 k 3. 随车辆和车辆数量的不同而变化，并且基于道路-O.N的确定。 5.2.2 研究O。 N.与Motor O.N.一起，根据规范定义了汽车火花点火式发动机燃料的抗爆指数 D4814 燃料的抗爆指数接近许多车辆的道路辛烷值，张贴在美国的零售分配泵上，并在车辆手册中参考。 这通常表现为: 5.2.3 研究O.N.也可单独使用或与其他因素结合使用，以确定在美国以外的世界地区运行的车辆的火花点火式发动机燃料的道路O.N.能力。 5.3 Research O.N.用于测量含有含氧化合物的火花点火式发动机燃料的抗爆性能。 5.4 研究O.N.对于固定式和其他非机动发动机应用中使用的火花点火式发动机燃料的规范非常重要。

1.1 This laboratory test method covers the quantitative determination of the knock rating of liquid spark-ignition engine fuel in terms of Research O.N., including fuels that contain up to 25 % v/v of ethanol. However, this test method may not be applicable to fuel and fuel components that are primarily oxygenates. 2 The sample fuel is tested using a standardized single cylinder, four-stroke cycle, variable compression ratio, carbureted, CFR engine run in accordance with a defined set of operating conditions. The O.N. scale is defined by the volumetric composition of PRF blends. The sample fuel knock intensity is compared to that of one or more PRF blends. The O.N. of the PRF blend that matches the K.I. of the sample fuel establishes the Research O.N. 1.2 The O.N. scale covers the range from 0 to 120 octane number but this test method has a working range from 40 to 120 Research O.N. Typical commercial fuels produced for spark-ignition engines rate in the 88 to 101 Research O.N. range. Testing of gasoline blend stocks or other process stream materials can produce ratings at various levels throughout the Research O.N. range. 1.3 The values of operating conditions are stated in SI units and are considered standard. The values in parentheses are the historical inch-pound units. The standardized CFR engine measurements continue to be in inch-pound units only because of the extensive and expensive tooling that has been created for this equipment. 1.4 For purposes of determining conformance with all specified limits in this standard, an observed value or a calculated value shall be rounded “to the nearest unit” in the last right-hand digit used in expressing the specified limit, in accordance with the rounding method of Practice E29 . 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see Section 8 , 14.4.1 , 15.5.1 , 16.6.1 , Annex A1 , A2.2.3.1 , A2.2.3.3 ( 6 ) and ( 9 ), A2.3.5 , X3.3.7 , X4.2.3.1 , X4.3.4.1 , X4.3.9.3 , X4.3.11.4 , and X4.5.1.8 . 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Research O.N. correlates with commercial automotive spark-ignition engine antiknock performance under mild conditions of operation. 5.2 Research O.N. is used by engine manufacturers, petroleum refiners and marketers, and in commerce as a primary specification measurement related to the matching of fuels and engines. 5.2.1 Empirical correlations that permit calculation of automotive antiknock performance are based on the general equation: Values of k 1 , k 2 , and k 3 vary with vehicles and vehicle populations and are based on road-O.N. determinations. 5.2.2 Research O.N., in conjunction with Motor O.N., defines the antiknock index of automotive spark-ignition engine fuels, in accordance with Specification D4814 . The antiknock index of a fuel approximates the Road octane ratings for many vehicles, is posted on retail dispensing pumps in the U.S., and is referred to in vehicle manuals. This is more commonly presented as: 5.2.3 Research O.N. is also used either alone or in conjunction with other factors to define the Road O.N. capabilities of spark-ignition engine fuels for vehicles operating in areas of the world other than the United States. 5.3 Research O.N. is used for measuring the antiknock performance of spark-ignition engine fuels that contain oxygenates. 5.4 Research O.N. is important in relation to the specifications for spark-ignition engine fuels used in stationary and other nonautomotive engine applications.