GAS SENSOR

摘要

A gas sensor is provided which has a rapid heating property and which can detect A/F ratio with high accuracy and can detect specifically a stoichiometric environment with high accuracy. The gas sensor has a limiting current type gas sensor element. The gas sensor element has a cup-shaped solid electrolyte, a reference electrode formed on an inside surface of the solid electrolyte, a measuring electrode formed on an outside surface of the solid electrolyte and a heater. The heater is disposed inside the solid electrolyte so that a tip end thereof contacts the inside surface of the solid electrolyte. The gas sensor outputs the limiting current value depending on an oxygen concentration in exhaust gases by applying a predetermined voltage between the reference electrode and the measuring electrode. The measuring electrode, which a length thereof in a direction is 0.5 mm to 3.0 mm, is housed in a range 0.5 mm to 7.5 mm from a tip end of the solid electrolyte in the direction.

主权项

1. A gas sensor comprising:
a solid electrolyte which has a cup-shaped closed-end cylindrical shape; a reference electrode which is formed on an inside surface of the solid electrolyte; a measuring electrode which is formed on an outside surface of the solid electrolyte; and a heater which has a heating part heating the solid electrolyte and a tip end disposed inside the solid electrolyte so as to contact the inside surface of the solid electrolyte, wherein a limiting current type gas sensor element sis configured to output a limiting current value depending on specific concentration of measured gases by applying predetermined voltage between the reference electrode and the measuring electrode, wherein a length of the measuring electrode in an axial direction is 0.5 mm to 3.0 mm, and the measuring electrode being provided so as to fall within a range of 0.5 mm to 7.5 mm from a tip end of the solid electrolyte in the axial direction.