Method for detection of performance reduction of exhaust gas pur

Details Method for detection of performance reduction of exhaust gas pur Method for detection of performance reduction of exhaust gas pur

1996-12-04

1998-12-29

Achutamurthy, Ponnathapura

Chemistry: analytical and immunological testing

Measurement of electrical or magnetic property or thermal...

By means of a solid body in contact with a fluid

436147, 436155, 423212, 4232132, 423224, 423235, 4232391, 423DIG6, 423DIG13, 60272, 60273, 60282, 60299, 502514, 502515, G01N 2700, B01J 802

Patent

active

058540792

ABSTRACT:
A method for detection of the performance reduction of an exhaust gas purification catalyst used for reducing the concentration(s) of combustible components or (and) nitrogen oxides all present in an exhaust gas, which method detects a reduction in the heat amount E.sub.g generated from the exhaust gas by the reaction of the exhaust gas catalyzed by the catalyst, or a reduction in the cumulative heat amount generated from the exhaust gas by said reaction in a predetermined temperature range taken by the catalyst during its temperature increase. This method can detect the performance reduction of the catalyst accurately without conducting constant-speed vehicle running for a long time.

REFERENCES:
patent: 5613360 (1997-03-01), Iwai et al.

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