1.1 本试验方法包括定量测定常规柴油和含有十六烷值改进剂添加剂的柴油的指示十六烷值（ICN）；适用于典型规格的产品 D975 、1-D和2-D级柴油、欧洲标准EN 590和加拿大标准CAN/CGSB-3.517和CAN/CGSB3.520。该试验方法也适用于生物柴油、含有生物柴油材料的柴油混合燃料（例如，规范中规定的材料 D975 , D6751 , D7467 和欧洲标准EN 14214、EN 16734和EN 16709），非- 石油来源、烃油、柴油混合成分、航空涡轮机燃料和聚甲醛二甲醚（OME）。 1.2 本试验方法利用了一个恒定容积燃烧室（CVCC），将燃油直接喷射到加热的压缩空气中。使用参考燃料混合物校准仪器。ICN是使用特定于仪器的参考燃料校准曲线直接从点火延迟确定的。 1.3 本试验方法及其精度涵盖35 ICN至85 ICN（含35 ICN）的校准范围。分析仪可以在校准范围外测量ICN，但精度尚未确定。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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）。本标准的用户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。第7节“危险”中给出了一些具体的危险说明。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 通过本试验方法确定的ICN值提供了压燃式发动机中使用的柴油点火特性的测量值。 5.2 该测试可用于发动机制造商、炼油厂、燃料生产商和商业中，作为规范辅助，以关联或匹配燃料和发动机。 5.3 柴油ICN测定与满标度、变速、变负荷柴油发动机的关系尚不完全清楚。 5.4 该测试可应用于非传统柴油。 5.5 该测试确定ICN；它需要大约40毫升的样品和大约25分钟的测试时间 最小。 5.6 本试验方法基于能源研究所试验方法IP 617。

1.1 This test method covers the quantitative determination of the indicated cetane number (ICN) of conventional diesel fuel oils, and diesel fuel oils containing cetane number improver additives; it is applicable to products typical of Specification D975 , Grades No.1-D and 2-D diesel fuel oils, European standard EN 590, and Canadian standards CAN/CGSB-3.517 and CAN/CGSB-3.520. The test method is also applicable to biodiesel, blends of diesel fuel oils containing biodiesel material (for example, materials as specified in Specifications D975 , D6751 , D7467 and European standards EN 14214, EN 16734, and EN 16709), diesel fuels from non-petroleum origin, hydrocarbon oils, diesel fuel oil blending components, aviation turbine fuels, and polyoxymethylene dimethyl ether (OME). 1.2 This test method utilizes a constant volume combustion chamber (CVCC) with direct fuel injection into heated compressed air. The apparatus is calibrated using blends of reference fuels. ICN is determined directly from ignition delay using an instrument specific reference fuel calibration curve. 1.3 This test method and its precision cover the calibrated range of 35 ICN to 85 ICN, inclusive. The analyzer can measure ICN outside the calibrated range, but the precision has not been determined. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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. Some specific hazards statements are given in Section 7 on Hazards. 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 The ICN value determined by this test method provides a measure of the ignition characteristics of diesel fuel oil used in compression ignition engines. 5.2 This test can be used by engine manufacturers, petroleum refiners, fuel producers and in commerce as a specification aid to relate or match fuels and engines. 5.3 The relationship of diesel fuel ICN determinations to the full scale, variable speed, variable load diesel engine is not completely understood. 5.4 This test can be applied to non-conventional diesel fuels. 5.5 This test determines ICN; it requires a sample of approximately 40 mL and a test time of approximately 25 min. 5.6 This test method is based on the Energy Institute Test Method IP 617.