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1. 发明授权

US06377052B1 Monitoring fluid condition through an aperture 失效
标题翻译：通过孔监测流体状况
公开(公告)号：US06377052B1
公开(公告)日：2002-04-23
申请号：US09433495
申请日：1999-11-03
申请人： Peter J. McGinnis , Paul G. Rops , Mark H. Polczynski , Francis C. Edrozo , Richard W. Hirthe , Steven R. Schachameyer , Lian Q. Zou
发明人： Peter J. McGinnis , Paul G. Rops , Mark H. Polczynski , Francis C. Edrozo , Richard W. Hirthe , Steven R. Schachameyer , Lian Q. Zou
IPC分类号： G02N2702
CPC分类号： G01N27/07 , G01N27/02 , G01N33/2888
摘要： A method for real time monitoring fluid in a vessel with a probe having a pair of electrodes immersed in the fluid. The disclosed probe has the electrodes arranged helically on a rod, sized and configured for insertion in an engine dipstick hole. Preferably, the probe has spiral electrode winding up regions different pitch to provide improved impedance response at low fractional Hertz and high (at least one Hertz) frequencies of excitation. In one version with alternating voltage the difference in current magnitude measured at the low and high frequencies is compared with stored known values for known fluid conditions and an electrical signal indicative of fluid condition is generated. Examples with engine drain oil and heavy duty transmission lubricant fluid are presented. The impedance properties measured can determine the percentage remaining useful life (RUL) of the fluid. In another version of the method the current phase shift angle is measured at the fractional Hertzian frequency; and, from known values of current phase shift angle of the fluid, at various conditions, the condition of the fluid determined. The differential current measured and the measured phase shift angle may be combined, for example, by the square of the sum of the squares procedure to provide an enhanced impedance change indicator.
摘要翻译：一种用于具有探针的血管中的实时监测流体的方法，所述探针具有浸在流体中的一对电极。所公开的探针具有螺旋地布置在杆上的电极，其尺寸和构造用于插入发动机量油尺孔中。优选地，探针具有不同间距的螺旋电极卷绕区域，以在低分数赫兹和高（至少一赫兹）激发频率下提供改进的阻抗响应。在具有交流电压的一个版本中，在低频和高频测量的电流幅度差与已知流体条件的已知已知值进行比较，并且产生指示流体状态的电信号。介绍了发动机排放油和重型变速器润滑油的实例。测量的阻抗特性可以确定流体的剩余使用寿命（RUL）百分比。在该方法的另一个版本中，当前相移角以分数赫兹频率测量; 并且根据流体的当前相移角的已知值，在各种条件下，确定流体的状态。测量的差动电流和测量的相移角可以例如通过平方和的程序的平方相加来提供增强的阻抗变化指示器。

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