Capacitive sensing apparatus for sensing a plurality of operatin

Pumps – With signal – indicator – or inspection means

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417 53, 731181, 73116, F04B 4900

Patent

active

061527025

ABSTRACT:
An apparatus and method for sensing a parameter of a hydraulic pump. The hydraulic pump includes a housing and an input shaft. The shaft is rotationally driven relative to the housing and electrically coupled to the housing. The hydraulic pump forms a variable capacitor. The apparatus includes an electrode portion positioned adjacent to the input shaft and is electrically isolated from the housing and input shaft. The electrode portion and the input shaft form a fixed capacitor. The fixed capacitor and the variable capacitor are coupled. The apparatus supplies electrical energy to the electrode portion and produces a capacitive signal indicative of the capacitance value of the variable capacitor. The apparatus further applies a filter to the capacitive signal and produces a filtered capacitive signal. The parameter of the hydraulic pump is determined as a function of the filtered capacitive signal.

REFERENCES:
patent: Re31062 (1982-10-01), Burke, Jr.
patent: 4473338 (1984-09-01), Garmong
patent: 4489551 (1984-12-01), Watanabe et al.
patent: 5528928 (1996-06-01), Baker et al.

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