Engine over-temperature and oil pressure loss audible warning de

Details Engine over-temperature and oil pressure loss audible warning de Engine over-temperature and oil pressure loss audible warning de

1981-04-10

1983-11-22

Swann, III, Glen R.

Communications: electrical

Selective

Having indication or alarm

307 10R, 340 57, 340 60, 340515, 340516, G08B 1900, B60Q 500

Patent

active

044172311

ABSTRACT:
An audible warning device is disclosed that is for use with internal combustion engines to monitor engine temperature and oil pressure and produce an audible warning signal if an over-temperature or oil pressure loss situation develops. An integrated circuit voltage comparator compares the output of a variable resistance temperature sensor against a reference voltage that is generated by a resistor network. The comparator drives an audible signal transducer to warn an operator of an over-temperature condition. Additionally, an input to the comparator from an oil pressure switch causes an audible warning to be produced if a loss of oil pressure is encountered. Self-test features are included to produce momentary audible signals each time the engine is started to indicate proper circuit functioning.
An alternate embodiment of the invention uses digital techniques and a microprocessor as a digital comparator to monitor the engine's temperature and oil pressure and operate the warning transducer if a dangerous situation develops.

REFERENCES:
patent: 3302171 (1967-01-01), Sensing
patent: 3866166 (1975-02-01), Kerscher et al.
patent: 3893108 (1975-07-01), McBride, Jr. et al.
patent: 3906440 (1975-09-01), Haupt
patent: 3949356 (1976-04-01), Fuzzell et al.
patent: 4107646 (1978-08-01), Arai et al.
patent: 4136329 (1979-01-01), Trobert
patent: 4287504 (1981-09-01), Simon et al.
patent: 4317364 (1982-03-01), Asano et al.

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