Method for detecting air-fuel ratio

Details Method for detecting air-fuel ratio Method for detecting air-fuel ratio

1987-09-02

1989-03-21

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204425, 204427, G01N 2746

Patent

active

048140457

ABSTRACT:
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).

REFERENCES:
patent: 4294668 (1981-10-01), Young
patent: 4356065 (1982-10-01), Dietz
patent: 4437971 (1984-03-01), Csanitz et al.
patent: 4543176 (1985-09-01), Harada et al.
patent: 4629535 (1986-12-01), Oyama et al.

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