Patent ID: 6365021
Filing Date: 2002-04-02
Classification: G01N

Abstract:
An oxygen sensor adapted for mounting in an exhaust passage of an engine for detecting an oxygen component contained in exhaust gas, comprising:a sensor element unit including a first electrode; a second electrode disposed on one side of said first electrode with a first solid electrolyte layer positioned therebetween, said first solid electrolyte layer is constructed of stabilized zirconia; a third electrode disposed on the other side of said first electrode with a second solid electrolyte layer positioned therebetween, thereby detecting migration of oxygen ions between said first electrode and said second electrode and migration of oxygen ions between said first electrode and said third electrode, said second electrolyte layer being constructed of two layers, each of said two layers being constructed of stabilized zirconia, one of said two layers including a heater mounting portion; and a plate heater provided in said heater mounting portion.