| 摘要 |
PURPOSE:To improve the rising characteristics of the glow plug by a method wherein two kinds of heat generators are embedded in a ceramic heater structure and interconnected to each other provided with a gap therebetween sufficient enough to delay a heat conduction between the heat generating parts of the heat generators. CONSTITUTION:The first heat generator 20 of the glow plug is made of an electrically conductive material having a small resistance temperature coefficient and the second heat generator 21 is made of an electrically conductive material having a resistance temperature coefficient larger than that of the material of the first heat generator 20. These first and second heat generators 20 and 21 are interconnected facing to each other with a certain gap between the heat generating parts 20a and 21a thereof, so that a heat influence of the first heat generating part 20a on the front side on the second heat generating part 21a is effected with a certain time delay. By this, if a current control by the second heat generator 21 is delayed to prolong a time period for supplying a large current to the first heat generator 20, a rapid glowing improves the temprature rising characteristics. |
