Current detection circuit for A/F sensor

Details Current detection circuit for A/F sensor Current detection circuit for A/F sensor

2005-01-18

2005-01-18

Patidar, Jay (Department: 2858)

Electricity: measuring and testing

Internal-combustion engine ignition system or device

C073S023320

Reexamination Certificate

active

06844734

ABSTRACT:
A highly flexible current detection circuit for an A/F sensor, that can readily provide for a change to an A/F sensor having a difference characteristic. The A/F sensor current detection circuit of the invention comprises: an operational amplifier for generating a voltage to be applied to the A/F sensor; a current-measuring first resistor connected between the operational amplifier and the A/F sensor; voltage-dividing second and third resistors connected in series with each other with one end thereof connected between the operational amplifier and the first resistor; a first output terminal provided between the operational amplifier and the first resistor; a second output terminal provided between the first resistor and the A/F sensor; and a third output terminal provided between the voltage-dividing second and third resistors. When measuring the sensor element admittance with this circuit, the third output terminal is used in place of the first output terminal.

REFERENCES:
patent: 5980710 (1999-11-01), Kurokawa et al.
patent: 20020179443 (2002-12-01), Hada et al.
patent: 10-90218 (1998-04-01), None
patent: 2000-46791 (2000-02-01), None
patent: 2000-329739 (2000-11-01), None
Patent Abstract of Japan, Publication No. 10090218 A, Published on Apr. 10, 1998, in the name of Schnaibel Eberhard, et al.
Patent Abstract of Japan, Publication No. 2000046791 A, Published on Feb. 18, 2000, in the name of Kurokawa Hidekazu, et al.
Patent Abstract of Japan, Publication No. 2000329739 A, Published on Nov. 30, 2000, in the name of Touwaki Chihiro, et al.

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