Method of and apparatus for monitoring operation of a catalyst

Details Method of and apparatus for monitoring operation of a catalyst Method of and apparatus for monitoring operation of a catalyst

1994-08-01

1997-02-11

Teska, Kevin J.

Boots, shoes, and leggings

36443103, 36443105, 60274, 60276, 60277, 60285, 123694, 123676, 123674, 731181, G06G 770, F01N 300

Patent

active

056027370

ABSTRACT:
The operation of a catalyst can be monitored using a two part test. An engine management system is arranged to perturb the oxygen concentration of the exhaust gas of an internal combustion engine such that an oxygen concentration of the gas entering the catalyst varies between oxygen rich and oxygen deficient. A first test involves counting the number of transitions of the gas leaving the catalyst between two predetermined oxygen concentrations in response to a predetermined number of transitions of the gas entering the catalyst. A second test is performed if the first test indicates the catalyst to be faulty. The second test involves forming an integral of the oxygen concentration of the gas leaving the catalyst and correcting the integral for gas flow through the catalyst.

REFERENCES:
patent: 5343701 (1994-09-01), Douta et al.
patent: 5417061 (1995-05-01), Maeda et al.

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