Oil level detection circuit

Details Oil level detection circuit Oil level detection circuit

1983-01-17

1985-03-05

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340 52F, 340620, 340622, 340527, 73292, G08B 2100, B60Q 100

Patent

active

045034192

ABSTRACT:
Low oil level in an engine crankcase is detected immediately after the ignition switch is turned on by a circuit including the ignition switch, an oil level sensor and a coolant temperature sensor wherein a control circuit generates an output if a low oil level signal is present when the ignition switch is turned on. An enabling circuit allows an output only if the ignition switch has been turned off for a sufficient time period to allow oil drain back to the crankcase. A time delay circuit responsive to coolant temperature and the ignition switch prevents a control circuit output after the ignition switch is turned off for a short period when the temperature is high and a long period when the temperature is low.

REFERENCES:
patent: 3914735 (1975-10-01), Guillaume
patent: 4367462 (1983-01-01), Dressler
patent: 4409832 (1983-10-01), Konjedic et al.
patent: 4438422 (1984-03-01), Nojiri et al.

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