Abstract: A deterioration detecting apparatus for an exhaust gas sensor of an internal combustion engine, the exhaust gas sensor including a sensor element and a heater that heats the sensor element, computes a first sensor characteristic parameter, which is related to a characteristic of the sensor element, by estimating an interchange state of thermal energy between the sensor element and a periphery of the sensor element. The deterioration detecting apparatus senses impedance of the sensor element. The deterioration detecting apparatus computes a second sensor characteristic parameter, which is related to the characteristic of the sensor element, based on the sensed impedance. The deterioration detecting apparatus determines a degree of deterioration of the exhaust gas sensor by comparing the first sensor characteristic parameter and the second sensor characteristic parameter.

Abstract: A deterioration detecting apparatus for an exhaust gas sensor of an internal combustion engine, the exhaust gas sensor including a sensor element and a heater that heats the sensor element, computes a first sensor characteristic parameter, which is related to a characteristic of the sensor element, by estimating an interchange state of thermal energy between the sensor element and a periphery of the sensor element. The deterioration detecting apparatus senses impedance of the sensor element. The deterioration detecting apparatus computes a second sensor characteristic parameter, which is related to the characteristic of the sensor element, based on the sensed impedance. The deterioration detecting apparatus determines a degree of deterioration of the exhaust gas sensor by comparing the first sensor characteristic parameter and the second sensor characteristic parameter.

Abstract: The present invention provides a novel spray pump inspection apparatus and method, which allow for accurate acceptability check of a spray pump even with an actuator attached to the spray pump, and are superior in inspection capability and operability to the prior art. The inventive spray apparatus is adapted to inspect a spray pump (20) which sprays a liquid from a container, and includes vibration sensors (2, 3) to be positioned adjacent the spray pump (20), and abnormality detection means (6) which detects spraying abnormality of the spray pump (20) on the basis of low frequency signal components of not higher than a predetermined frequency contained in detection signals generated by the vibration sensors (2, 3) when the spray pump (20) is actuated in air.