Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-10-31
2006-10-31
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S658000, C324S686000, C073S053050
Reexamination Certificate
active
07129715
ABSTRACT:
An engine oil deterioration detection apparatus includes a sensing capacitor CS formed of paired electrodes dipped into engine oil whose deterioration is to be detected, the engine oil deterioration detection apparatus detecting deterioration of the engine oil on the basis of a change in electrostatic capacitance of the sensing capacitor CS. A measurement signal generation circuit generates a measurement signal to be supplied to the sensing capacitor CS. A detection signal output circuit outputs a detection signal on the basis of a response wave signal produced from the sensing capacitor CS in response to supply of the measurement signal thereto, the detection signal reflecting the electrostatic capacitance of the sensing capacitor CS. A temperature compensation mechanism is provided to compensate for a level change of the detection signal stemming from a temperature characteristic and/or a time-course deterioration of the detection signal output circuit.
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Hayashi Shin'ichi
Sasaki Hisashi
Deb Anjan
Kramskaya Marina
NGK Spark Plug Co. Ltd.
Sughrue & Mion, PLLC
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