A desired effective voltage can be ensured with certainty in a preheating control. An operation control part 52 reads a correction value c with respect to a battery voltage Vb at the time of performing correction based on preliminarily stored correlation b...

For an A/F sensor 10 equipped with a sensor element 11, a cover 12 that covers the sensor element , and a heater 13 that raises the temperature of the sensor element 11 and provided to an exhaust system of an engine, an ECU 1A has timing estimation means f...

The method involves heating a sensor to an operating temperature by an impulse-like operating heater, and counting heater switching impulses that exhibit preset characteristic i.e. length. Aging of the sensor is calculated based on the number of switching ...

In a process to operate a heated automotive exhaust gas sensor, the sensor is operated from time to time at a temperature which is below the nominal operating value at which there is thermodynamic equilibrium in the catalytic components (31, 33). An Indepe...

A heater control system is provided for controlling the temperature of a heater used to heat a solid electrolyte-made sensor element of a gas concentration sensor up to a given temperature at which the sensor element is activated to provide a correct gas c...