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1. 发明授权

US06380746B1 Monitoring fluid condition with a spiral electrode configuration 失效
标题翻译：用螺旋电极配置监测流体状况
公开(公告)号：US06380746B1
公开(公告)日：2002-04-30
申请号：US09432971
申请日：1999-11-03
申请人： Mark H. Polczynski , Paul G. Rops , Robert A. Bauer , Martin A. Seitz , Richard W. Hirthe
发明人： Mark H. Polczynski , Paul G. Rops , Robert A. Bauer , Martin A. Seitz , Richard W. Hirthe
IPC分类号： G01N2707
CPC分类号： G01N33/2888 , G01N27/02
摘要： A plug for insertion through the wall of a vessel filled with fluid to be monitored has an extension immersed in the fluid which has a pair of wire electrodes helically wound thereon in spaced arrangement. The electrodes are wound at a uniform pitch in one embodiment and wound with regions of closely and widely spaced pitches in another embodiment. In a third embodiment, the electrodes are helically wound in spaced parallel arrangement at a pitch greater than the spacing of the pair. A thermistor is disposed on the extension for providing a fluid temperature signal. The electrodes are excited sequentially by a low voltage at a fractional Hertz (low) frequency and a (high) frequency of at least one Hertz and the current and temperature are measured. The impedance and differential impedance are computed from the measured currents. From stored values of the differential impedance as a function of temperature for various known fluid conditions, the condition of the fluid is determined; and, if greater than a predetermined threshold, an alarm is activated and/or the fluid condition displayed.
摘要翻译：用于插入通过填充有待监测流体的容器的壁的插塞具有浸入流体中的延伸部，该延伸部具有以间隔开的方式螺旋地缠绕在其上的一对线电极。在一个实施例中，电极以均匀的间距缠绕，并且在另一个实施例中缠绕有紧密且间隔很宽的间距的区域。在第三实施例中，电极以间隔大致间距的间隔螺旋形缠绕在一起。热敏电阻设置在延伸部上以提供流体温度信号。电极依次以低分数Hertz（低）频率和（高）频率至少为1赫兹的低电压激励，并测量电流和温度。从测量的电流计算阻抗和差分阻抗。从针对各种已知流体条件的作为温度的函数的差分阻抗的存储值，确定流体的条件; 并且如果大于预定阈值，则激活报警和/或显示流体状态。

2. 发明授权

US06278281B1 Fluid condition monitor 失效
标题翻译：流体状态监测
公开(公告)号：US06278281B1
公开(公告)日：2001-08-21
申请号：US09220556
申请日：1998-12-23
申请人： Robert A. Bauer , Richard W. Hirthe , Mark H. Polczynski , Martin A. Seitz , James E. Hansen
发明人： Robert A. Bauer , Richard W. Hirthe , Mark H. Polczynski , Martin A. Seitz , James E. Hansen
IPC分类号： G01N2702
CPC分类号： G01N27/221 , G01N33/2888
摘要： A fluid condition monitor suitable for real time monitoring of a fluid in a fluid system such as on-board vehicle monitoring of engine oil and transmission fluid to determine contamination. A capacitive spaced array electrode probe is immersed in the fluid and an oscillating voltage is applied at a first frequency of at least one hertz and the current IB measured as an analog of the bulk fluid impedance. The voltage is also applied to the probe at a second frequency of less then one hertz and the current Is measured as an analog of the electrode surface impedance. The difference in measured currents &Dgr;I is determined electrically compared with a predetermined threshold value; and, the measured first frequency current IB is compared with an upper and lower limit value for IB determined empirically for the known baseline fluid. If &Dgr;I is below the threshold or IB is not within the upper and lower limits, a fault condition is declared and an indicator is activated to warn that the fluid is not suitable for continued operation of the system. An alternate embodiment includes a fluid level sensor.
摘要翻译：一种流体状态监测器，适用于实时监测流体系统中的流体，例如车载车辆监测发动机机油和变速箱油以确定污染。将电容性间隔的阵列电极探针浸入流体中，并以至少一赫兹的第一频率施加振荡电压，并以当前体积阻抗的模拟量测量电流IB。电压也以小于1赫兹的第二频率施加到探头，并且电流被测量为电极表面阻抗的模拟。与预定阈值相比，测量电流DELTAI的差异被确定; 并且将所测量的第一频率电流IB与对于已知基线流体凭经验确定的IB的上限值和下限值进行比较。如果DELTAI低于阈值或IB不在上限和下限范围内，则声明故障状态并启动指示器以警告流体不适合系统的继续操作。替代实施例包括液位传感器。

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