Heater control apparatus of air-fuel ratio sensor and method thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 20, 2004
Grant Date -
Dec 27, 2001
app pub date -
Jun 22, 2001
filing date -
Jun 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
According to the present invention, when controlling a heater in an air-fuel ratio sensor, a crack of sensor element due to an exhaust condensed water is certainly avoided. To this end, an element temperature is detected by measuring an impedance of the sensor element and a power supply amount to the heater for heating the sensor element is feedback controlled so that the element temperature reaches a target temperature. Here, the target temperature is set to a lower side temperature, compared to other conditions, on a condition that a wall temperature of an exhaust system is low and a water content in the exhaust is condensed in the exhaust system. Or, an initial value of the power supply amount is set corresponding to the element temperature before the start of power supply to the heater. Or, an increase component of the power supply amount is set corresponding to the element temperature, and the power supply amount to the heater is feedforward controlled so as to be increased gradually by each predetermined increase component from a predetermined initial value.
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