Engine-Oil Analysis Sensor

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的工作方式。因此，基于行驶里程或发动机工作时间的换油间隔不一定能确定机油的使用质量。柴油发动机的一个特别问题是，油的分散性可能很快失效，这使得悬浮的烟灰颗粒“凝胶化”油，即使实际悬浮的烟灰颗粒只有1%到2% （w/v）的浓度。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。当油的其它性质发生变化时，油的分散性就会丧失。抗氧化性，仍有90%完好无损。一些发动机的运行计划，特别是高负荷到低负荷的漂移，可能会在不到100小时的运行中导致总分散性损失。拟议的第一阶段研究旨在利用红内辐射的散射作为检测从分散良好的粒子到分散失败时形成的团块的转变的手段。波长源的选择与粒子和团块的有效散射直径相匹配，这样可以检测到转变与经典瑞利散射行为的偏离。＊＊＊

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. ***