Ignition system with resistance value difference fire extinction

Details Ignition system with resistance value difference fire extinction Ignition system with resistance value difference fire extinction

1996-02-20

1998-09-08

Jeffery, John A.

Electric heating

Heating devices

Resistive element: igniter type

219269, 431 66, 431255, F23Q 712, F23N 500

Patent

active

058047964

ABSTRACT:
In an ignition system for sensing a change in a resistance value during a combustion of a heating resistive element and detecting a fire extinction, a resistance value of the heating resistive element is sensed by a resistance value detecting circuit at a predetermined time interval set by an interval setting circuit, and a difference between the resistance value and that sensed before an elapse of the predetermined period of time is calculated by a resistance value calculating circuit. A comparing circuit compares a difference in the resistance values with a reference value stored in a reference value memory, and a extinction detecting circuit detects a fire extinction when the difference calculated by the resistance value difference calculating circuit had exceeded the reference value. Accordingly, there is attained an ignition system which reasonably determines a fire extinction without an additional complex structure.

REFERENCES:
patent: 4741692 (1988-05-01), Sadakata et al.
patent: 5240406 (1993-08-01), Kanesaka

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