公开(公告)号：US5644239A

公开(公告)日：1997-07-01

申请号：US228561

申请日：1994-04-15

申请人： Joseph Y. Huang ,  Cheng-Foo Chen

发明人： Joseph Y. Huang ,  Cheng-Foo Chen

IPC分类号： G01N33/28 ,  G01N27/02

CPC分类号： G01N33/2888

摘要： A method and apparatus for determining the condition of a fluid used in a process, such as a lubricating oil used in an internal combustion engine. A sample of the fluid is heated to an elevated temperature, a measurement is taken of an electrical characteristic of the fluid at that first temperature, the fluid is heated still further, and the aforesaid electrical characteristic is measured again. The two measured values of the electrical characteristic are used to calculate a quality parameter which, when compared with quality parameter values corresponding to fluid samples of varying condition, gives an estimate of the relative condition of the fluid sample under test. The test procedure also includes a measurement of the opacity of the fluid sample to visible light, with this measurement being used in conjunction with the calculated quality parameter to more accurately determine the relative condition of the fluid under test. The tester unit may be operated in a stand-alone manner or it may be connected to a computer for storage and display of test results.

摘要翻译： 一种用于确定在诸如内燃机中使用的润滑油的过程中使用的流体的状态的方法和装置。 将流体样品加热到升高的温度，在第一温度下测量流体的电特性，再进一步加热流体，再次测量上述电特性。 使用电特性的两个测量值来计算质量参数，当与对应于变化条件的流体样品的质量参数值进行比较时，给出被测流体样品的相对条件的估计。 测试程序还包括流体样品对可见光的不透明度的测量，该测量与所计算的质量参数结合使用，以更精确地确定被测流体的相对状况。 测试器单元可以以独立的方式操作，或者可以连接到计算机用于存储和显示测试结果。