Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1999-06-28
2000-09-05
Denion, Thomas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, 60276, F01N 300
Patent
active
061125180
ABSTRACT:
A system and method for monitoring catalytic converter efficiency monitor the switch ratio of upstream and downstream exhaust gas oxygen sensors based on an acceptable temperature range of the catalytic converter. In one embodiment, catalytic converter temperature is determined based on exhaust gas temperature. The exhaust gas temperature may be used to infer the temperature of the catalytic converter mid-bed. The efficiency may be determined based on a correspondence with a number of mass air flow ranges. The system and method may also use vehicle speed and EGR to assure that the monitor samples data during repeatable, robust load-speed-temperature conditions. Switch data is stored in keep-alive memory to increase the confidence of the efficiency determination due to a larger data collection phase. A filter having a cycle based constant may be used to filter a current switch ratio before incorporating it into an average switch ratio.
REFERENCES:
patent: 5289678 (1994-03-01), Grutter
patent: 5325664 (1994-07-01), Seki et al.
patent: 5357751 (1994-10-01), Orzel
patent: 5381657 (1995-01-01), Takizawa et al.
patent: 5400592 (1995-03-01), Mukaihira et al.
patent: 5412941 (1995-05-01), Suzuki et al.
patent: 5627757 (1997-05-01), Comignaghi et al.
patent: 5632144 (1997-05-01), Isobe
patent: 5673555 (1997-10-01), Achleitner
patent: 5706652 (1998-01-01), Sultan
patent: 5732551 (1998-03-01), Naber et al.
patent: 5743082 (1998-04-01), Matsumoto et al.
patent: 5865026 (1999-02-01), Davey et al.
patent: 5945597 (1999-08-01), Poublon et al.
patent: 5953905 (1999-09-01), Jerger et al.
Davey Christopher Kirk
Dickison Donald Fenwick
Jerger Robert Joseph
Kluzner Michael I.
Denion Thomas
Ford Global Technologies Inc.
Lippa Allan J.
May Rogers L.
Tran Binh
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