Air fuel ratio detection apparatus

Details Air fuel ratio detection apparatus Air fuel ratio detection apparatus

2011-06-21

2011-06-21

Nguyen, Nam X (Department: 1724)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S424000, C205S784500, C073S023310, C073S023320

Reexamination Certificate

active

07964073

ABSTRACT:
Using a gas detection voltage Vs output from a terminal CU, a determination is made at to whether, after startup of an air-fuel ratio detection apparatus (1), a full-range air-fuel ratio sensor (10) has reached a semi-activated state in which a determination can be made as to whether the air-fuel ratio is on the rich or lean side based on a change in a gas detection signal Vic. After determining that the sensor has reached the semi-activated state, the signal Vic is compared with a threshold to determine whether the air-fuel ratio is on the rich or lean side. In the apparatus (1), the potential difference between an outer pump electrode of a pump cell (14) and a reference electrode of an oxygen concentration measurement cell (24) is obtained via a first differential amplification circuit (53) as the gas detection signal Vic, the signal Vic being highly responsive to a change in air-fuel ratio of exhaust gas.

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Non-Final Office Action, dated Apr. 1, 2010 (in U.S. Appl. No. 11/518,945).
Final Office Action, dated Jul. 12, 2010 (in U.S. Appl. No. 11/518,945).

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