Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-06-27
1988-03-29
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340 59, G08B 2100, B60Q 100
Patent
active
047346825
ABSTRACT:
A low fluid level warning system (100) is adapted for use with a conventional oil circulation and low pressure warning system in an engine-driven vehicle. Oil from a crankcase reservoir (102) is pumped through an inlet conduit (110) to varius engine supply lines (116). A portion of the oil is also pumped into an enclosed chamber (124). A pressure sensor diaphragm (132) and switch contacts (130) sense the chamber pressure and illuminate a warning lamp (142) when the pressure is below a predetermined pressure. A drain conduit (160) extends from the bottom of the chamber at the bottom of the oil reservoir (102). A vent conduit (150) extends from the top of the chamber to a predetermined level in the reservoir (102). If the oil in the reservoir (102) is below the predetermined level, the chamber (124) drains completely when the engine is turned off. If the oil in the reservoir (102) is above the predetermined level, the chamber oil does not drain. When the engine is next started, the duration of time (short or extended) necessary for the chamber pressure to build up, and extinguish the warning lamp, is indicative of whether the oil in the reservoir is above or below the predetermined level.
REFERENCES:
patent: 2588761 (1952-03-01), Raby
patent: 2671893 (1954-03-01), Van Scoy et al.
patent: 2800648 (1957-07-01), Kelly
patent: 3132331 (1964-05-01), Boddy
patent: 3196389 (1965-07-01), Heidner
patent: 3333259 (1967-07-01), Carothers, Jr.
Rowland James L.
Tumm Brian R.
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