| 摘要 |
<p>An exhaust sensor control system for an exhaust sensor (10) is mounted in an exhaust path of an internal combustion engine. The exhaust sensor (10) includes a sensor element (14) for generating an output in accordance with the status of an exhaust gas and a heater (24) for heating said sensor element. The exhaust sensor control system comprises: recovery value counting means (30, 144) for counting the elapsed time or the cumulative intake air amount after internal combustion engine startup as a characteristics recovery value; heater control means (30, 136, 146) for controlling said heater (24) with a recovery target temperature, which is higher than a normal target temperature, set as a target temperature for said sensor element (14) until said characteristics recovery value reaches a recovery determination value; cumulative lean time counting means (30, 138, 140) for counting, after internal combustion engine startup, the cumulative length of time during which the air-fuel ratio is lean; and determination value correction means (30, 142) for increasing said characteristics recovery value or decreasing said recovery determination value with an increase in said cumulative length of time.</p> |
