Engine-Oil Analysis Sensor

发动机油分析传感器

• 批准号: 9361414
• 负责人: John Hilliard
• 金额: $ 6.5万
• 依托单位: CFR, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-01 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9361414&HistoricalAwards=false
• 关键词: Engine; Oil; Analysis; Sensor

9361414 Hilliard The useful life of engine oil is known to be highly dependent on formulation and the engine operating mode. Consequently, an oil- change interval based on miles traveled or engine operating hours does not necessarily define the in-service quality of the oil. One problem in particular for diesel engines is that oil dispersancy can fail very rapidly, this enables the suspended soot particles to "gel" the oil even when the actual suspended soot particles are only present at a 1% to 2% (w/v) concentration. The result of gelling is increased viscosity, poor cold-start protection, more soot abrasion wear and loss of lubricity. Dispersancy of an oil can be lost when all other oil properties, eg. oxidative resistance, are still 90% intact. Some engine operating schedules - notably high-load to low-load excursions - can lead to total dispersancy loss in less than 100 hours of operation. The proposed Phase 1 research is directed at using scattering of intra-red radiation as a means of detecting the transition from well-dispersed particles to the agglomerates that form as dispersancy fails. The wavelength source is chosen to match the effective scattering diameter of the particles and agglomerates in such a way that the transition can be detected as a deviation from classical Rayleigh scattering behavior. ***

9361414 Hilliard众所周知，发动机油的使用寿命在很大程度上取决于配方和发动机运行模式。 因此，基于行驶里程或发动机运行小时数的换油间隔不一定限定油的使用质量。 特别是对于柴油发动机的一个问题是油分散性可能非常迅速地失效，这使得悬浮的烟灰颗粒能够使油“凝胶化”，即使当实际悬浮的烟灰颗粒仅以1%至2%（w/v）浓度存在时。 胶凝的结果是粘度增加，冷启动保护差，更多的烟灰磨损和润滑性损失。 当油的所有其他性质，如粘度，抗氧化性，仍然保持90%的完整性。 一些发动机运行计划-特别是高负荷到低负荷的偏移-可能导致在不到100小时的运行中完全分散性损失。 拟议的第一阶段研究旨在使用红内辐射的散射作为检测从分散良好的颗粒到分散失败时形成的团聚体的过渡的手段。 选择波长源以匹配颗粒和团聚体的有效散射直径，使得可以检测到与经典瑞利散射行为的偏离。 ***