Double air-fuel ratio sensor system having improved response cha

Details Double air-fuel ratio sensor system having improved response cha Double air-fuel ratio sensor system having improved response cha

1986-04-07

1987-09-15

Dolinar, Andrew M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 123489, F02D 4114

Patent

active

046930760

ABSTRACT:
In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an air-fuel ratio correction amount is remarkably changed when the output of the upstream-side air-fuel ratio sensor is switched from the lean side to the rich side or vice versa, and the actual air-fuel ratio is adjusted in accordance with the air-fuel ratio correction amount. The remarkable-change speed of the air-fuel ratio correction amount is changed in accordance with the output of the downstream-side air-fuel ratio sensor.

REFERENCES:
patent: 3939654 (1976-02-01), Creps
patent: 4027477 (1977-06-01), Storey
patent: 4130095 (1978-12-01), Bowler et al.
patent: 4235204 (1980-11-01), Rice
patent: 4475517 (1984-10-01), Kobayashi et al.
patent: 4539958 (1985-09-01), Ito et al.
patent: 4561400 (1985-12-01), Hattori
patent: 4571683 (1986-02-01), Kobayashi et al.

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