System and method for monitoring a catalytic converter

Details System and method for monitoring a catalytic converter System and method for monitoring a catalytic converter

1997-01-17

1999-09-21

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60277, F01N 300

Patent

active

059539054

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 mid-bed for each of a number of mass air flow ranges. The system and method 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 is used to filter a current switch ratio before incorporating it into an average switch ratio.

REFERENCES:
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: 5632144 (1997-05-01), Isobe
patent: 5673555 (1997-10-01), Achleitner
patent: 5706652 (1998-01-01), Sultan
patent: 5743082 (1998-04-01), Matsumoto et al.

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