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Patent Searching and Data


Title:
A/Fセンサの電流検出回路
Document Type and Number:
Japanese Patent JP3992509
Kind Code:
B2
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.

Inventors:
福田 照久
森口 広
服部 一孝
池田 慎治
Application Number:
JP2002040127A
Publication Date:
October 17, 2007
Filing Date:
February 18, 2002
Export Citation:
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Assignee:
富士通テン株式会社
トヨタ自動車株式会社
International Classes:
G01N27/41; F02D45/00; G01R19/00
Domestic Patent References:
JP2001228111A
JP2000329739A
JP2000171439A
JP2000028575A
Attorney, Agent or Firm:
石田 敬
鶴田 準一
土屋 繁
西山 雅也