Catalyst degradation detecting apparatus

Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element responds proportionally to a variable signal...

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422171, 60276, 60299, 60303, 60308, 436 37, G05D 900, F01N 300

Patent

active

055453775

ABSTRACT:
An exhaust purification device includes a catalytic converter for purifying exhaust gas from an engine, air-fuel ratio sensors provided on the upstream side and downstream side of the catalytic converter, respectively, for detecting the concentration of a specific component in the exhaust gas, a control device for processing the output of the air-fuel ratio sensors and generating a signal based on the processed output, and a catalyst degradation warning device which operates according to the signal generated by the control device for warning an operator of a degraded catalyst, where the responsiveness of the downstream side air-fuel ratio sensor is lower than the responsiveness of the upstream side air-fuel ratio sensor.

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patent: 5363647 (1994-11-01), Uhuchi et al.
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patent: 5426937 (1995-06-01), Ohuchi et al.

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