| 摘要 |
A multi-layer ceramic heater for igniting fuel in a diesel engine having an electrode, an insulative layer disposed over the electrode, a resistive layer disposed over the insulative layer at the tip of the heater, and a conductive layer covering the insulative layer and extending from the resistive layer over the insulative layer to the base of heater. A substantial proportion of the volume of resistive layer is located in close proximity to the tip of heater. The resistive layer has a positive temperature coefficient (PTC) of electrical resistance and preferably a portion of the electrode is variably resistive for self regulation purposes. Due to the geometry of the resistive layer and the variable resistive characteristics of the resistive layer and the electrode, the heater is well suited to applications that require quick start heating as well as good afterglow properties or prolonged heating at high temperatures.
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