F - Mech Eng,Light,Heat,Weapons – 01 – N
Patent
F - Mech Eng,Light,Heat,Weapons
01
N
F01N 9/00 (2006.01) F01N 11/00 (2006.01) F02D 41/14 (2006.01) F02B 75/02 (2006.01)
Patent
CA 2104573
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.
Dobbins Kelvin L.
Hamburg Douglas R.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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