COMBUSTION SYSTEM USING LIMITING CURRENT TYPE OXYGEN SENSOR ELEMENT, SENSOR ELEMENT MANUFACTURING METHOD OR HEATING AND DRIVING METHOD OF SENSOR ELEMENT USED THEREFOR

摘要

PPROBLEM TO BE SOLVED: To provide a combustion system of excellent safety capable of easily checking whether or not the combustion operation and the operation of a limiting current type oxygen sensor element are normal. PSOLUTION: A sensor output abnormality determination means 14 reads the sensor output (A) when a limiting current type oxygen sensor element 11 is exposed to combustion exhaust gas, and determines that the combustion operation is a normal one in which the exhaust gas is burned in a normal oxygen concentration range if the sensor output is in a predetermined range, or that the combustion operation is an abnormal one in which the exhaust gas is burned in a different oxygen concentration range if the sensor output is not in the predetermined range. Therefore, the combustion state can be easily inspected. Similarly, the sensor output abnormality determination means reads the sensor output (B) when the sensor element is exposed to the atmosphere, and determines that the combustion operation is a normal one if the sensor output is in a predetermined range, or determines that the combustion operation is an abnormal one if the sensor output is not in the predetermined range. Therefore, the limiting current type oxygen sensor element 11 can be easily inspected. A combustion system of excellent safety can be provided thereby. PCOPYRIGHT: (C)2004,JPO&NCIPI