Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1997-06-26
1998-09-08
Biegel, Ronald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340438, B60Q 500
Patent
active
058050590
ABSTRACT:
A voice playback temperature sensor is provided including a temperature sensor situated within an engine of a vehicle and adapted to transmit at an output thereof a voltage with a level directly proportional to a temperature within the engine of the vehicle. Further provided is a potentiometer having a first terminal connected to a constant voltage source, a second terminal connected to ground, and a third terminal. The potentiometer is adapted supply a user selected, adjustable voltage at the third terminal thereof. Also included is an operational amplifier having a positive terminal input connected to the output of the temperature sensor and a negative terminal input connected to the third terminal of the potentiometer. The operational amplifier is adapted to provide an activation signal at an output thereof upon the voltage at the positive terminal and the voltage at the negative terminal thereof differing by a predetermined amount. A non-retriggerable one-shot multivibrator is provided having an input connected to the output of operational amplifier for transmitting the activation for a predetermined fixed length of time upon at least the instantaneous receipt thereof from the operational amplifier. Finally, a voice play back mechanism is connected between a speaker and the multivibrator. The play back mechanism is adapted to recite a verbal warning via the speaker only during the receipt of the activation signal.
REFERENCES:
patent: 3631388 (1971-12-01), Strong
patent: 3927399 (1975-12-01), Fuzzell
patent: 4359714 (1982-11-01), Tsunoda et al.
patent: 4940964 (1990-07-01), Dao
patent: 4971583 (1990-11-01), Umchara
patent: 5016006 (1991-05-01), Umchara
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