Glow plug
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United States of America Patent
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Jul 11, 2017
Issued Date -
N/A
app pub date -
Apr 10, 2013
filing date -
Apr 16, 2012
priority date (Note) -
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Abstract
A glow plug including a coil housed in a tube. The coil includes a heating coil made of an Ni—Cr alloy disposed on a front end side, and a control coil connected to a rear end side of the heating coil. The coil has a normal temperature resistance value of 300 mΩ to 500 mΩ. The accumulated amount of heat generated by the heating coil for two seconds from the start of energization is 400 joules or less. The ratio of an inrush current value at the start of energization to a current value two seconds after the start of energization is 1.2 or higher. The control coil has a temperature resistance coefficient of five or higher and a resistance value of 25 mΩ or higher at a portion between a front end of the control coil and L/2, where L is the length of the control coil.
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