| 摘要 |
PURPOSE:To provide an air fuel ratio detector of an internal combustion engine which is shorter in the rising time after the closing of a power source with a better heating efficiency of an electric heater. CONSTITUTION:This air fuel ratio detector has an exhaust side electrode 13 on one surface of a solid electrolyte 11 and an atmosphere side electrode 12 on the other surface thereof. An atmospheric air chamber 32 is arranged communicating with an atmospheric air duct 28 at a position facing the atmosphere side electrode 12 and an electric heater 20 contacting the atmosphere side electrode 12 between the atmospheric air chamber 32 and the atmosphere side electrode 12 through an insulation sheet 30. The insulation sheet 30 and an insulation plate 35 of the electric heater 20 have air holes 31 made avoiding the electric heater 20. |
