Method of diagnosing a catalytic converter

Details Method of diagnosing a catalytic converter Method of diagnosing a catalytic converter

Filed on

1997-06-11

Date issued

1999-11-23

Examiner

Denion, Thomas E.

Patent Class

Power plants

SubClass

Internal combustion engine with treatment or handling of...

SubSubClass

Methods

Other Related Categories

60277, 731181, F01N 300

Type

Patent

Status

active

Patent number

059878835

Description

ABSTRACT:
The invention is directed to a method for evaluating the operability of a catalytic converter mounted in the exhaust-gas system of an internal combustion engine. In the method, the actual value of a signal of an exhaust-gas probe mounted downstream of the catalytic converter is detected and an expectation value of the signal of the exhaust-gas probe is formed from quantities measured upstream of the catalytic converter. A measure is formed for the deviation of the actual value from the expectation value and the operability of the catalytic converter is evaluated on the basis of the measure.

REFERENCES:
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 5228287 (1993-07-01), Kuronishi et al.
patent: 5335538 (1994-08-01), Blischke et al.
patent: 5404718 (1995-04-01), Orzel et al.
patent: 5602737 (1997-02-01), Sindano et al.

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