Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Lubricant testing
Patent
1994-08-30
1996-07-30
Brock, Michael J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Lubricant testing
73 5401, 324663, 324 711, 340603, G01N 1100, G01N 3330
Patent
active
055400868
ABSTRACT:
An oil deterioration sensor includes a housing, a substrate with a first capacitive plate mounted within the housing, a second capacitive plate mounted to the housing close to the first capacitive plate, and a total reference capacitor which includes an external fixed reference capacitor. The second capacitive plate is mounted to the housing such that oil freely circulates within a gap between the first and second capacitive plates thereby defining an oil deterioration sensor capacitor. The respective capacitances of the oil deterioration capacitor and the total reference capacitor provide an engine oil deterioration indication for the oil within the gap. The first capacitive plate is divided into a major sensing area, and a minor sensing area covering a relatively small portion of the total area of the first capacitive plate. The major sensing area and the second capacitive plate form the oil deterioration sensor capacitor. The total reference capacitor further includes an oil deterioration reference capacitor defined by the minor reference area and the second capacitive plate. The oil deterioration sensor further includes a temperature sensitive resistive element thermally connected to the substrate for providing a temperature adjustment to the engine oil deterioration indication, and circuitry utilizing the respective capacitances of the oil deterioration sensor capacitor and the total reference capacitor to generate the engine oil deterioration indication.
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Dean R. Harrison and John Dimeff, "Transducers", Rev. Sci. Instrum., vol. 44, No. 10, Oct. 1973, pp. 1468-1472.
Nassar Marcos A.
Park Kyong M.
Brock Michael J.
Kavlico Corporation
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