On-board catalyst health monitoring and control system adaptation in internal combustion engines
First Claim
1. A catalyst deterioration detection system comprising:
- a pre-catalytic converter gas sensor;
a post-catalytic converter gas sensor;
at least one computing device in communication with the pre-catalytic converter and post-catalytic converter gas sensors, the at least one computing device programmed to monitor catalyst deterioration by performing actions including;
estimating a catalyst gas storage level by comparing a difference between a pre-catalytic converter gas level from the pre-catalytic converter gas sensor and a post-catalytic converter gas level from the post-catalytic converter gas sensor;
comparing the estimated catalyst gas storage level to a baseline catalyst gas storage level; and
determining that the catalyst is deteriorated in response to the baseline catalyst gas storage level exceeding the estimated gas storage level by a threshold difference.
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Accused Products
Abstract
Various embodiments include systems adapted to monitor catalyst deterioration. Some embodiments include a catalyst deterioration detection system including a pre-catalytic converter gas sensor, a post-catalytic converter gas sensor, at least one computing device in communication with the pre-catalytic converter and post-catalytic converter gas sensors, the at least one computing device configured to monitor catalyst deterioration by performing actions including estimating a catalyst gas storage level by comparing a difference between a pre-catalytic converter gas level from the pre-catalytic converter gas sensor and a post-catalytic converter gas level from the post-catalytic converter gas sensor, comparing the estimated catalyst gas storage level to a baseline catalyst gas storage level and determining that the catalyst is deteriorated in response to the baseline catalyst gas storage level exceeding the estimated gas storage level by a threshold difference.
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Citations
13 Claims
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1. A catalyst deterioration detection system comprising:
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a pre-catalytic converter gas sensor; a post-catalytic converter gas sensor; at least one computing device in communication with the pre-catalytic converter and post-catalytic converter gas sensors, the at least one computing device programmed to monitor catalyst deterioration by performing actions including; estimating a catalyst gas storage level by comparing a difference between a pre-catalytic converter gas level from the pre-catalytic converter gas sensor and a post-catalytic converter gas level from the post-catalytic converter gas sensor; comparing the estimated catalyst gas storage level to a baseline catalyst gas storage level; and determining that the catalyst is deteriorated in response to the baseline catalyst gas storage level exceeding the estimated gas storage level by a threshold difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A catalyst deterioration detection system including a three-way catalytic converter system for use with a three-way catalytic converter, the catalyst deterioration detection system comprising:
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a pre-catalytic converter gas sensor; a post-catalytic converter gas sensor; at least one computing device in communication with the pre-catalytic converter and post-catalytic converter gas sensors, the at least one computing device programmed to monitor catalyst deterioration by performing actions including; estimating a catalyst gas storage level by comparing a difference between a pre-catalytic converter gas level from the pre-catalytic converter gas sensor and a post-catalytic converter gas level from the post-catalytic converter gas sensor, wherein the pre-catalytic converter gas level includes a pre-catalytic converter oxygen level, wherein the post-catalytic converter gas level includes a post-catalytic converter oxygen level, wherein the estimated catalyst gas storage level includes an estimated catalyst oxygen storage level; comparing the estimated catalyst gas storage level to a baseline catalyst gas storage level, wherein the baseline catalyst gas storage level includes a baseline catalyst oxygen storage level; determining that the catalyst is deteriorated in response to the baseline catalyst gas storage level exceeding the estimated gas s rage level by a threshold difference; and estimating a carbon monoxide (CO) emissions level based on the estimated catalyst oxygen storage level; and wherein the determining that the catalyst is deteriorated is performed in response to both the reference catalyst oxygen storage level exceeding the baseline catalyst oxygen storage level by a threshold difference and the estimated CO emissions level exceeding a reference CO emissions level by a second threshold difference.
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13. A catalyst deterioration detection system comprising:
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a pre-catalytic converter gas sensor; a post-catalytic converter gas sensor; at least one computing device in communication with the pre-catalytic converter and post-catalytic converter gas sensors, the at least one computing device programmed to monitor catalyst deterioration by performing actions including; estimating a catalyst gas storage level by comparing a difference between a pre-catalytic converter gas level from the pre-catalytic converter gas sensor and a post-catalytic converter gas level from the post-catalytic converter gas sensor; comparing the estimated catalyst gas storage level to a baseline catalyst gas storage level; determining that the catalyst is deteriorated in response to the baseline catalyst gas storage level exceeding the estimated gas storage level by a threshold difference; and providing an instruction to a control unit to adapt an air flow ratio of an engine in response to a deviation in the catalyst deterioration level.
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Specification