Importance

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Abstract

A control system includes a temperature sensor, an occupant detector, and a responsive circuit for activating a warning horn or to provide ventilation when an occupant is sensed in a dangerously hot passenger compartment. The circuit is passively actuated, such as by using a switch system incorporating a shape memory alloy (SMA) wire or a bimetal switch, in order to control temperatures in the passenger compartment or trunk of vehicles, such as when the vehicle is parked in the sun. The thermal switch actuates an occupant sensor using remote accessory power from the vehicle's battery, yet without creating an unacceptable phantom current drain on the vehicle's battery. Shape memory alloy wire contracts when temperature reaches a predetermined intolerable temperature in a vehicle, thereby closing a normally open switch contact to complete an electrical circuit.

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First Claim