Internal-combustion engines – Lubricators – Crankcase – pressure control
Patent
1986-12-03
1988-05-24
Cross, E. Rollins
Internal-combustion engines
Lubricators
Crankcase, pressure control
184108, 1841051, 184 15, 184 64, F01M 100
Patent
active
047458933
ABSTRACT:
An oil level sensor includes a sensor body adapted to be mounted to the block or casing of an oil-containing reservoir. A probe including a pair of electrodes forming a capacitor extends from the sensor body so that the capacitor will be at least partially immersed in the oil to detect the level thereof. At least one of the electrodes is insulated so that the apparent capacitance of the capacitor is relatively insensitive to any change in the conductivity of the oil at high temperatures. Circuitry is provided in response to the capacitance of the capacitor for signalling the level of the oil, which capacitance is a function of the oil level. The sensor body is mounted to the block by external threads on the probe. The electrodes of the probe extend proximally past the threads to provide an increased capacitance for the sensor. The electrodes of the probe are concentric and the inner electrode is supported at both ends to reduce fatigue. Circuitry is also provided for automatically testing the proper operation of the sensor.
REFERENCES:
patent: 4344136 (1982-08-01), Panik
patent: 4459584 (1984-07-01), Clarkson
patent: 4583085 (1986-04-01), Beller
patent: 4609796 (1986-09-01), Bergsma
patent: 4628302 (1986-12-01), Barr et al.
patent: 4638288 (1987-01-01), Remec
patent: 4654646 (1987-03-01), Charboneau
Atherton Kim Wesley
Barr A. Brinkley
Clow Charles R.
Harmon Thomas M.
Mawet Patrick H.
Caterpillar Inc.
Cross E. Rollins
Morgan Terry D.
Muir Robert E.
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