Method for monitoring catalytic converter efficiency

Details Method for monitoring catalytic converter efficiency Method for monitoring catalytic converter efficiency

1997-07-31

1999-01-26

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 731181, F01N 318, F01N 320

Patent

active

058626611

ABSTRACT:
The catalytic converter of an internal combustion engine is monitored with regard to its conversion capacity. A sensor downstream of the catalytic converter measures the oxygen concentration in the exhaust gas leaving the catalytic converter. A mean value is determined of the oxygen concentration measurement signal, and the area between the measurement signal and the mean value is calculated. The area is then compared with a predetermined comparison value, and a low conversion capacity of the catalytic converter is deduced from the comparison if the area is greater than the comparison value. A corresponding error signal may be stored in memory or immediately output as a warning for the driver of the vehicle.

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patent: 5379587 (1995-01-01), Toyoda
patent: 5400592 (1995-03-01), Mukaihira et al.
patent: 5743086 (1998-04-01), Nagai

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