| 摘要 |
The oxygen is supplied the diffusion resistor (3) for a specified period of time during operation so as to oxidize the contaminate particles (6) adhering to the diffusion resistor (3), when the solid electrolyte (2) is impressed a voltage by the power source (8) so as to move the oxygen from the solid electrolyte (2) to the diffusion resistor (3). For a specified period during operation, such as during a certain period after ignition key is switched on, during the rich air-fuel ratio operation, during idling, or during warmup operation at starting, the oxygen is supplied to the diffusion resistor (3). It is possible to provide the air-fuel ratio sensor (1) which has no output variation due to degradation over long period of use by removing the contaminated particles (6).
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