System and method for monitoring a catalytic converter using ada

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

1998-10-16

2000-02-01

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, F01N 300

Patent

active

060189444

ABSTRACT:
A system and method for monitoring emissions by monitoring performance of a catalytic converter using a predetermined indicated threshold value include determining a current value for the indicator based on signals generated by at least one exhaust gas sensor, modifying a historical indicator value based on the current value, and adjusting the predetermined indicator threshold based on the historical indicator value. The predetermined indicator threshold is adjusted provided various adapt criteria are satisfied. The historical indicator value is compared to the threshold to determine whether to generate a malfunction indicator signal. In one embodiment, emissions are indicated using a switch ratio based on the number of switches or transitions for upstream and downstream exhaust gas oxygen sensors.

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patent: 5357753 (1994-10-01), Wade
patent: 5385016 (1995-01-01), Zimlich et al.
patent: 5467593 (1995-11-01), Vincent et al.
patent: 5706652 (1998-01-01), Sultan
patent: 5758490 (1998-06-01), Maki et al.
patent: 5857163 (1999-01-01), Trombley et al.

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