A deterioration diagnostic device for an exhaust gas purifier

Details A deterioration diagnostic device for an exhaust gas purifier A deterioration diagnostic device for an exhaust gas purifier

G - Physics

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G01M 17/00 (2006.01) F01N 11/00 (2006.01) F02D 41/14 (2006.01) G01M 15/00 (2006.01) F02D 41/02 (2006.01)

Patent

CA 2486221

The invention provides a deterioration diagnostic device for diagnosing a degradation condition of an exhaust gas purifier disposed in an exhaust passage in an engine based on a sensor value of an exhaust gas sensor that is disposed downstream of the purifier. The device includes detecting-signal generating unit for generating a detecting-signal having particular frequency components and multiplying the generated signal to a basic fuel injection amount so as to calculate a fuel injection amount and exhaust gas purifier evaluating means for extracting a frequency response corresponding to the detecting-signal from an output of the exhaust gas sensor of the engine, the output being in response to the calculated fuel injection amount, so as to determine a condition of the purifier based on the extracted frequency response.

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