Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1992-11-25
1993-12-28
Kamen, Noah P.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, 60285, F01N 320, F02D 414
Patent
active
052728722
ABSTRACT:
Apparatus and method are disclosed for monitoring catalytic converter efficiency in treating exhaust gas from an internal combustion engine having fuel control means for controlling the air to fuel ratio at which fuel is supplied to the engine in response to a fuel flow control signal. During a normal operation mode, the control signal means generates the fuel flow control signal based at least in part on output signals from first and second EGO sensors exposed to the exhaust gas upstream and downstream, respectively, of the catalytic converter. The normal operation mode is periodically interrupted by a test operation mode, preferably initiated during substantially steady state operation of the engine, during which the engine is controlled in response to the output signal from the first EGO sensor without the signal from the second EGO sensor. Air to fuel ratio perturbations about a mean value corresponding to stoichiometry are introduced, comprising an initial lean interval of air to fuel ratio higher than stoichiometry, typically for about 5 seconds, followed by a series of rich intervals alternating with lean intervals. An efficiency value for the catalytic converter corresponding to its emissions treatment efficiency is determined based on the number of perturbations detected by the upstream EGO sensor versus the number detected by the downstream EGO sensor.
REFERENCES:
patent: 5077970 (1992-01-01), Hamburg
patent: 5099647 (1992-03-01), Hamburg
patent: 5119628 (1992-06-01), Uema et al.
Grutter Peter J.
Stock Gerald G.
Abolins Peter
Ford Motor Company
Kamen Noah P.
May Roger L.
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