Diagnostic system for monitoring catalyst performance
First Claim
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1. A catalyst performance diagnostics system, comprising:
- a plurality of treatment devices, wherein said plurality of treatment devices comprise a first treatment device, a second treatment device, and a third treatment device, and wherein at least two treatment devices comprise a nitrogen oxides adsorber material;
a plurality of gas sensors disposed in fluid communication with said plurality of treatment devices;
wherein said plurality of gas sensors comprise a first gas sensor disposed before said first treatment device, a second gas sensor disposed between said second treatment device and said third treatment device, and a third gas sensor disposed after said third treatment device, and an on-board diagnostic system coupled to said plurality of gas sensors.
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Abstract
A diagnostic system for monitoring catalyst performance in an exhaust system comprises a plurality of treatment devices catalytically treating an exhaust gas stream, and a plurality of gas sensors for monitoring the catalyst performance of the treatment devices to determine when sulfur poisoning occurs. An on-board diagnostic system receives signals from the gas sensors, and, based upon response time differentials between sensors, determines whether the treatment devices are experiencing sulfur poisoning.
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Citations
18 Claims
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1. A catalyst performance diagnostics system, comprising:
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a plurality of treatment devices, wherein said plurality of treatment devices comprise a first treatment device, a second treatment device, and a third treatment device, and wherein at least two treatment devices comprise a nitrogen oxides adsorber material;
a plurality of gas sensors disposed in fluid communication with said plurality of treatment devices;
wherein said plurality of gas sensors comprise a first gas sensor disposed before said first treatment device, a second gas sensor disposed between said second treatment device and said third treatment device, and a third gas sensor disposed after said third treatment device, andan on-board diagnostic system coupled to said plurality of gas sensors. - View Dependent Claims (2, 3, 4)
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5. A method for monitoring catalyst performance, comprising:
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introducing an exhaust gas stream into an exhaust system that includes a plurality of treatment devices and a plurality of gas sensors disposed in fluid communication with said plurality of treatment devices, wherein said plurality of treatment devices comprises a first treatment device, a second treatment device, and a third treatment device, and said plurality of gas sensors comprise a first gas sensor disposed before said first treatment device, a second gas sensor disposed between said second treatment device and said third treatment device, and a third gas sensor disposed after said third treatment device, and further wherein at least two treatment devices comprise a nitrogen oxides adsorber material;
monitoring said exhaust gas stream using said plurality of gas sensors;
passing said exhaust gas stream through said plurality of treatment devices;
measuring a first response time differential between said first gas sensor and said second gas sensor, and a second response time between said first gas sensor and said third gas sensor; and
desulfating said treatment devices based upon said first response time and said second response time. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A catalyst performance diagnostics system, comprising:
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a plurality of treatment devices, wherein said plurality comprises a first treatment device, a second treatment device, and a third treatment device;
a plurality of gas sensors disposed in fluid communication with said plurality of treatment devices, wherein said plurality of gas sensors comprise a first gas sensor disposed before said first treatment device, a second gas sensor disposed between said second treatment device and said third treatment device, and a third gas sensor disposed after said third treatment device; and
an on-board diagnostic system coupled to said plurality of gas sensors. - View Dependent Claims (16, 17, 18)
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Specification