Heated Zirconia Exhaust Gas Oxygen Sensor Having a Sheet-Shaped Sensing Element

This paper describes the design and property of an electrically heated zirconia exhaust gas oxygen sensor having small-sized and sheet-shaped sensing element.

Sensing element and sensor have been miniaturized by monolithic formation of sensing element and heater by means of thick-film techniques.

The difference in response property according to the angle of the electrode to exhaust gas flow because of the sheet-shaped configuration of sensing element was minimized by proper design of protective cover.

Similarity in λ control property and limit cycle frequency was demonstrated with heated zirconia oxygen sensor having test tube-shaped sensing element by engine dynamometer durability test over 120,000 equivalent miles.