Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1991-08-26
1992-11-03
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60285, 123691, F01N 220
Patent
active
051598108
ABSTRACT:
An exhaust gas oxygen sensor downstream of a catalytic converter is used to control a closed loop air/fuel ratio control system. A measured limit cycle frequency at various engine speed/load conditions is compared to stored benchmark limit cycle frequencies as functions of engine speed/load conditions. If the measured frequency is higher, the catalytic converter is considered to be degraded.
REFERENCES:
patent: 3969932 (1976-07-01), Rieger
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4622809 (1986-11-01), Abthoff et al.
Cushing John A.
Gopp Alexander Y.
Grutter Peter J.
Stock Gerald G.
Abolins Peter
Ford Motor Company
Hart Douglas
May Roger L.
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