Device for electrically monitoring oil level, particularly in au

Details Device for electrically monitoring oil level, particularly in au Device for electrically monitoring oil level, particularly in au

1986-06-05

1989-07-04

Orsino, Joseph A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340622, 73295, B60Q 100

Patent

active

048454699

ABSTRACT:
In a device for electrically monitoring oil level, particularly in automobile internal combustion engines, a first temperature-dependent resistance element (1) is housed within a hollow space in an oil measurement rod and positioned at the height of a filling level. The device signals a dropping of the oil level below the filling level. A first resistance element is connected to an evaluation circuit having a source of current (17-23, 26, 27). A second temperature-dependent resistance element (16) is located in the oil measurement rod at a lower point than the first temperature-dependent resistance element (1). In order to be able to monitor the oil level over a large temperature range, the second temperature-dependent resistance element (16) can be switched to the evaluation circuit (emitter resistor 19) for correction of a switching threshold of the evaluation circuit as a function of temperature.

REFERENCES:
patent: 3863210 (1975-01-01), Roland et al.
patent: 3939470 (1976-02-01), Arai et al.
patent: 4116045 (1978-09-01), Potter
patent: 4476714 (1984-10-01), Barry et al.

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