Method for checking the efficiency of a catalytic converter

Details Method for checking the efficiency of a catalytic converter Method for checking the efficiency of a catalytic converter

1995-11-27

1997-10-07

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

056735553

ABSTRACT:
A method is provided for checking the efficiency of a catalytic converter with an oxygen probe upstream of the catalytic converter and of an oxygen probe downstream of the catalytic converter. A ratio of times in which the oxygen probe downstream of the catalytic converter and the oxygen probe upstream of the catalytic converter indicate a rich or a lean mixture value is formed. The catalytic converter has a sufficient efficiency if the value of the smaller amount of the ratio values is lower than a predeterminable limit value.

REFERENCES:
patent: 5134847 (1992-08-01), Ogawa et al.
patent: 5289678 (1994-03-01), Grutter
patent: 5377558 (1995-01-01), Komatsu

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