Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
2009-03-04
2009-10-13
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C219S494000
Reexamination Certificate
active
07600508
ABSTRACT:
An exhaust sensor control system for an exhaust sensor is mounted in an exhaust path of an internal combustion engine, wherein the exhaust sensor includes a sensor element for generating an output in accordance with the status of an exhaust gas and a heater for heating the sensor element. The exhaust sensor control system includes a cumulative lean time counting means for counting, after internal combustion engine startup, the cumulative length of time during which the air-fuel ratio is lean; and a heater control means for controlling the heater with a recovery target temperature, which is higher than a normal target temperature, set as a target temperature for the sensor element until the cumulative length of time reaches a recovery determination value.
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Castro Arnold
Cronin Stephen K
Oliff & Berridg,e PLC
Toyota Jidosha & Kabushiki Kaisha
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