Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1986-12-29
1988-11-08
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
364509, 374142, G01F 2322, G01R 2726
Patent
active
047826983
ABSTRACT:
A single capacitor is used to measure the oil level in an engine or transmission and compensate the sensed capacitance for changes in dielectric constant. Measurements are made for two different running conditions, one giving a capacitance reading dependent only on dielectric constant and one giving a capacitance dependent on oil level as well as dielectric constant. The transmission application uses a capacitor that is fully immersed in oil when the engine is off and partly immersed when the engine is idling, so that both types of measurements can be obtained. The engine application uses a capacitor having an upper section spaced from a lower section. Only the lower section is immersed during engine idle to render dielectric constant information, while the upper section is partly immersed when the engine is off.
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General Motors Corporation
Hill Warren D.
Yasich Daniel M.
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