Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1998-09-22
2000-09-12
Denion, Thomas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60285, 60276, 60277, 123674, 731181, F01N 300
Patent
active
061160210
ABSTRACT:
A method for monitoring the performance of a catalytic converter (34) computes the oxygen storage capacity and desorption capacity of a catalyst within the catalytic converter (34). An engine control unit (10) receives mass flow rate information of air from a mass air flow rate sensor (12) and an injector driver (24), and receives electrical signals from an upstream exhaust gas sensor (28) and a downstream exhaust gas sensor (30). A rate modifier is determined from excess air ratios and an adaptation parameter. The engine control unit (10) calculates normalized air fuel ratios for the exhaust gas entering and leaving the catalytic converter (34) and performs numerical integration using the rate modifier to determine the oxygen storage capacity of the catalyst in the catalytic converter (34). The calculated oxygen storage capacity of the catalyst can be compared with threshold values to determine the performance of the catalytic converter (34).
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Badalament Michael A.
Bush Kevin J.
Chewter Alan
Church Bruce
Frankowski David
Cunningham Gary J.
Denion Thomas
Motorola Inc.
Tran Binh
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