发明名称 |
Current detection circuit for A/F sensor |
摘要 |
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. |
申请公布号 |
US6844734(B2) |
申请公布日期 |
2005.01.18 |
申请号 |
US20030367281 |
申请日期 |
2003.02.14 |
申请人 |
FUJITSU TEN LIMITED;TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
FUKUDA TERUHISA;MORIGUCHI HIROSHI;HATTORI KAZUTAKA;IKEDA SHINJI |
分类号 |
G01N27/41;F02D45/00;G01R19/00;(IPC1-7):F02P17/00;G01N7/00 |
主分类号 |
G01N27/41 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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