System for detecting deterioration of a three-way catalyst of an

Details System for detecting deterioration of a three-way catalyst of an System for detecting deterioration of a three-way catalyst of an

1991-06-18

1993-01-19

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 320

Patent

active

051798336

ABSTRACT:
A system for detecting deterioration of a three-way catalyst of an internal combustion engine comprises first and second HC sensors, and a central processing unit (CPU). The first and second HC sensors are arranged in the exhaust passage of the engine at locations upstream and downstream of the three-way catalyst, respectively, for detecting concentration of hydrocarbons present in exhaust gases. The central processing unit (CPU) is operable to compare an output from the first HC sensor with an output from the second HC sensor, and determine from results of the comparison whether the three-way catalyst is deteriorated.

REFERENCES:
patent: 3926154 (1975-12-01), Williams
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 3969932 (1976-07-01), Rieger et al.
patent: 4315243 (1982-02-01), Calvert, Sr.
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 4884066 (1989-11-01), Miyata et al.
patent: 5018348 (1991-05-01), Durschmidt et al.

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