Exhaust sensor e.g. lambda sensor, evaluating method, involves determining amplitude of signals based on oscillating output signals of sensor, where amplitude of signals is used for evaluation of sensor

摘要

The method involves arranging an exhaust sensor e.g. lambda sensor, in an exhaust duct, where the duct is connected with an internal-combustion engine. The engine is provided with lubricated or poor air-fuel ratio in an oscillating manner, and amplitude of signals is determined based on the oscillating output signals of the sensor, and is used for evaluation of the sensor. The determined amplitude is compared with a reference value, where the defective exhaust sensor is recognized when the measured amplitude is larger than the reference value.