Robert E Kidd

US Patent:

45034192, Mar 5, 1985

Filed:

Jan 17, 1983

Appl. No.:

6/458538

Inventors:

Robert C. Kidd - Warren OH
Lawrence J. Porn - Flushing MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

G08B 2100
B60Q 100

US Classification:

340 59

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.