The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2005
Filed:
Feb. 14, 2003
Teruhisa Fukuda, Kobe, JP;
Hiroshi Moriguchi, Kobe, JP;
Kazutaka Hattori, Susono, JP;
Shinji Ikeda, Mishima, JP;
Teruhisa Fukuda, Kobe, JP;
Hiroshi Moriguchi, Kobe, JP;
Kazutaka Hattori, Susono, JP;
Shinji Ikeda, Mishima, JP;
Fujitsu Ten Limited, Kobe, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
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.