Oil level detecting device

Details Oil level detecting device Oil level detecting device

2009-01-28

2011-11-01

Bugg, George (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

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

C340S450000, C340S425500

Reexamination Certificate

active

08049607

ABSTRACT:
To determine a failure of a float switch for detecting whether or not the oil level is less than or equal to a predetermined oil level. A predetermined oil level OLth is set between a normal oil level and a minimum oil level in view of the fact that when the oil level in an oil pan is normal, the oil level is decreased from the normal oil level to the minimum oil level during a predetermined time period just after starting an engine. When a float switch is not changed from an OFF position to an ON position during the predetermined time period after starting the engine, it is determined that the float switch suffers a failure or the oil level is excessive.

REFERENCES:
patent: 3846747 (1974-11-01), Arai et al.
patent: 3927390 (1975-12-01), Hill
patent: 4321590 (1982-03-01), Ishikawa et al.
patent: 5-66523 (1993-09-01), None
patent: WO 92/04605 (1992-03-01), None
patent: WO 2006/137507 (2006-12-01), None

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