Electric heating – Heating devices – Resistive element: igniter type
Reexamination Certificate
2008-01-15
2008-01-15
Hoang, Tu Ba (Department: 3742)
Electric heating
Heating devices
Resistive element: igniter type
C219S497000, C219S492000, C219S544000, C219S260000, C123S14500A, C123S14500A, C361S264000, C361S265000, C361S266000
Reexamination Certificate
active
07319208
ABSTRACT:
There is provided a control device for a glow plug, capable of controlling the energization of a resistance heater of the glow plug by a resistance control process while attaining good resistance control response under cooling of the heater by fuel injection and combustion gas and thereby stably controlling the amount of heat generated by the heater. The resistance heater includes a resistive heating element having a ratio of electrical resistance R1000 at 1000° C. to electrical resistance R20 at 20° C. of 6 or larger, and the glow plug is mounted with at least part of the resistive heating element being protrudingly located in an engine combustion chamber. Under such a condition, the control device controls energization of the resistance heater in a steady control mode to adjust electrical power supplied to the resistance heater in such a manner as to keep a resistance of the heater within a predetermined range.
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Gotoh Shunsuke
Kimata Hiroyuki
Kumada Chiaki
Muramatsu Seigo
Sakurai Takayuki
Hoang Tu Ba
NGK Spark Plug Co. Ltd.
Ralis Stephen J.
Sughrue & Mion, PLLC
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