Patent ID: 6723965
Filing Date: 2004-04-20
Classification: F02D

Abstract:
A heater control apparatus of an air-fuel ratio sensor which is mounted to an exhaust system of an internal combustion engine and equipped with a heater for heating a sensor element comprising:an element temperature detection unit for detecting an element temperature by measuring an impedance of the sensor element of said air-fuel ratio sensor; a target temperature setting unit for setting a target temperature of the element temperature; a heater power supply amount feedback control unit for feedback controlling a power supply amount to said heater so that the element temperature reaches said target temperature; and a heater control amount restraining unit for restraining at least one of said target temperature of the element temperature and the power supply amount to said heater to a lower temperature side, compared to other conditions, on a condition that a water content in the exhaust is condensed in an exhaust system.