Detecting device and method for engine catalyst deterioration

Details Detecting device and method for engine catalyst deterioration Detecting device and method for engine catalyst deterioration

1993-02-18

1994-08-16

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60274, 60277, F01N 300

Patent

active

053375564

ABSTRACT:
In a detecting method for deterioration of a catalyst inserted in an exhaust pipe, first, counting the number of times to cut the predetermined slice levels set in accordance with the engine operating conditions by O.sub.2 -sensors provided at the front and rear portions of the catalyst respectively. Then, a ratio of the counted numbers is calculated to judge a deterioration of a catalyst of a catalytic converter. Thus, influence of an output amplitude fluctuation of the RO.sub.2 sensor varying according to the operating condition is avoided to prevent a misjudgement of the deterioration of the catalyst.

REFERENCES:
patent: 5119628 (1992-06-01), Uema et al.

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