Patent ID: 6921879

Claim:
A sheathed-element glow plug provided with an ionic-current sensor, comprising: a housing; and a rod-shaped heating element arranged in a concentric bore hole of the housing, the heating element including: at least one insulating layer made of an electrically insulating ceramic material, a first lead layer made of an electroconductive ceramic material, a second lead layer made of the electroconductive ceramic material, a bar located at an end of the heating element on a combustion chamber side and made of the electroconductive ceramic material, the first lead layer and the second lead layer being connected directly at the end of the heating element on the combustion chamber side via the bar, a first electrode for detecting an ionic current, and a second electrode for detecting the ionic current, the first electrode and the second electrode being one of embedded in the at least one insulating layer and applied on the at least one insulating layer, wherein the first and second electrodes are not connected to the first and second lead layers.