Deterioration detector system for catalyst in use for emission gas purifier
First Claim
1. A deterioration detector system for catalyst used in an emission gas purifier comprising:
- (a) a passageway through which exhaust gas from an internal combustion engine passes in contact with a catalyst to facilitate reducing and oxidizing reactions among gaseous components, hydrocarbon, carbon monoxide and nitrogen oxide;
(b) a sensor placed in said passageway at a position downstream of said catalyst against a flow of said exhaust gas so as to generate an output substantially in direct proportion to air-fuel ratio of said exhaust gas, said sensor producing said output, the magnitude of which changes in a relationship with that of theoretical air-fuel ratio such that the greater the deterioration of said catalyst, the more removed the output of said sensor is from said theoretical air-fuel ratio; and
(c) an annunciator arranged including a switching module (210) to be activated when said output level of said sensor reaches at a predetermined level.
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Abstract
Deterioration detector system for catalyst in use for emission gas purifier, comprising; an emission passageway through which exhaust gas from internal combustion engine, passes by way of catalyst to facilitate the reducing and oxidizing reaction among the toxicant component of hydrocarbon, carbon monoxide and nitrogen oxide; a sensor placed at the emission passageway to position downstream of the catalyst against the exhaust gas flow so as to generate an output in direct proportion to air-fuel ratio in the exhaust gas; an annunciator arranged to activate in response to the output of more than the predetermined level generated from the air- fuel ratio sensor.
89 Citations
4 Claims
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1. A deterioration detector system for catalyst used in an emission gas purifier comprising:
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(a) a passageway through which exhaust gas from an internal combustion engine passes in contact with a catalyst to facilitate reducing and oxidizing reactions among gaseous components, hydrocarbon, carbon monoxide and nitrogen oxide; (b) a sensor placed in said passageway at a position downstream of said catalyst against a flow of said exhaust gas so as to generate an output substantially in direct proportion to air-fuel ratio of said exhaust gas, said sensor producing said output, the magnitude of which changes in a relationship with that of theoretical air-fuel ratio such that the greater the deterioration of said catalyst, the more removed the output of said sensor is from said theoretical air-fuel ratio; and (c) an annunciator arranged including a switching module (210) to be activated when said output level of said sensor reaches at a predetermined level. - View Dependent Claims (2, 3, 4)
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Specification