Electric heating – Heating devices – Resistive element: igniter type
Patent
1997-08-28
1999-04-13
Jeffery, John A.
Electric heating
Heating devices
Resistive element: igniter type
123145A, F23Q 700
Patent
active
058939938
ABSTRACT:
A glow plug includes a housing. A main body is at least partially disposed in the housing. The main body is supported with respect to the housing. An insulating member is included in the main body. A heating member is provided in the insulating member. A pair of lead wires are electrically connected to two ends of the heating member respectively. The lead wires extend out of the insulating member. At least one ion sensing electrode is provided in the insulating member. The ion sensing electrode is electrically connected to the heating member. The ion sensing electrode is operative for detecting a condition of ionization in a flame. The ion sensing electrode has a tip uncovered from the insulating member so as to be exposed to the flame. The heating member has a given portion extending between a center with respect to the electrical connection with the ion sensing electrode and an end of the heating member which is a negative side when a heating dc current is driven through the heating member. An electric resistance of the given portion of the heating member is smaller than an electric resistance of the ion sensing electrode between its tip and the electrical connection with the heating member.
REFERENCES:
patent: 4739731 (1988-04-01), Habich et al.
Denso Corporation
Jeffery John A.
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