Method and apparatus for judging the functioning of a catalytic

Details Method and apparatus for judging the functioning of a catalytic Method and apparatus for judging the functioning of a catalytic

1994-10-31

1996-09-10

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, F01N 320

Patent

active

055534503

ABSTRACT:
A method, including an amplitude evaluation of control oscillations of the oxygen content of the exhaust gas of an internal combustion engine in front of and behind a catalytic converter, for judging the operating condition of the converter in order to determine whether the performance of the catalytic converter has deteriorated past a predetermined point. As soon as this condition is detected using the amplitude evaluation, switching is effected to the frequency evaluation for judging the functioning of the catalytic converter.

REFERENCES:
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 5159810 (1992-11-01), Grutter

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