Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
2006-03-28
2006-03-28
Huynh, Hai (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C073S023320, C204S406000, C060S285000, C060S286000
Reexamination Certificate
active
07017567
ABSTRACT:
A device according to the present invention is provided with element temperature measurement voltage application circuit for temporarily applying a predetermined voltage for element temperature measurement to a sensor element of an air-fuel ratio sensor equipped to an exhaust system of an internal combustion engine, first sensor output reading circuit for reading in a sensor output just before applied with the voltage, and second sensor output reading circuit for reading in a sensor output being applied with the voltage, wherein the element temperature of the air-fuel ratio sensor is estimated based on the sensor output just before applied with the voltage and the sensor output being applied with the voltage. Further, during internal resistance measurement of the sensor element of the air-fuel ratio sensor equipped to the exhaust system of the internal combustion engine, a voltage applied to the heater for heating the sensor element is maintained to be constant.
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Hosoya Hajime
Ohkuma Shigeo
Takahashi Koji
Hitachi , Ltd.
Huynh Hai
McDermott Will & Emery LLP
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