Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1992-08-27
1993-11-30
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, F01N 325, F02D 700
Patent
active
052654168
ABSTRACT:
Apparatus, method and system are provided for monitoring catalytic converter efficiency in treating exhaust gas from an internal combustion engine. The air/fuel ratio fed to the engine is perturbed on a cylinder-to-cylinder basis above and below a mean or average air/fuel ratio. The signal from an exhaust gas exposed to the exhaust gas sensor downstream of the converter for the perturbation interval is compared to the signal for a non-perturbation interval. A signal is generated when the comparison indicates catalytic converter efficiency below a minimum acceptable level. The comparison may be carried out by comparing the difference in the mean value of the EGO sensor output signal for the perturbation and non-perturbation intervals to a preselected and stored reference value corresponding to the minimum acceptable efficiency. The efficiency monitoring test system may be incorporated into fuel control means for controlling air/fuel ratio during normal engine operation.
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Clemens et al.--SAE Technical Paper 900062, Detection of Catalyst Performance Loss Using On-Board Diagnostics, Feb. 26-Mar. 2, 1990.
Dobbins Kelvin L.
Hamburg Douglas R.
Argenbright Tony M.
Ford Motor Company
Macy M.
May Roger L.
Melotik Lorraine S.
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