Method for testing the functional capability of a catalytic conv

Details Method for testing the functional capability of a catalytic conv Method for testing the functional capability of a catalytic conv

1997-06-30

1999-11-02

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60277, 731181, F01N 300

Patent

active

059747870

ABSTRACT:
A method for testing the functional capability of a catalytic converter of an internal combustion engine uses an exhaust-gas probe having a measuring electrode for measuring the resistance of a metal oxide layer having low catalytic activity. The resistance of the metal oxide layer is dependent on the oxygen partial pressure in the exhaust gas, for a predetermined air factor. The conversion rate of a catalytic converter has an effect on the oxygen partial pressure in the exhaust gas downstream of the catalytic converter, so that the resistance of the metal oxide layer depends on the conversion efficiency of the catalytic converter. It is thus possible to test the functional capability of the catalytic converter with the simply constructed exhaust-gas probe using a simple resistance measurement.

REFERENCES:
patent: 4617795 (1986-10-01), Abthoff et al.
patent: 4884066 (1989-11-01), Miyata et al.
patent: 5357750 (1994-10-01), Ito et al.
patent: 5426934 (1995-06-01), Hunt et al.
Publication by Roth-Technik GmbH, Gaggenau "Double Function of a Probe".
P.G. Eastwood et al, "A new method for on-vehicle detection of catalyst malfunction based upon measurement of non-equilibrated gas mixtures", Sensors and Actuators B 24-25 (1995), pp. 665-669.
Peter Eastwood et al., "Konzept zur Uberprufung der Funktionstauglichkeit des Abgaskatalysators", Automobiltechnische Zeitschrift 96 (1994), pp. 18-24, method for detecting the functionality of a exhaust gas catalytic converter.

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