{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8485015","patent":{"patent_number":"US-8485015","title":"Degradation detection system for NOx sensor, and degradation detection method therefor","assignee":null,"inventors":[],"filing_date":"2011-10-05T00:00:00.000Z","publication_date":"2013-07-16T00:00:00.000Z","cpc_codes":["G01N"],"num_claims":12,"abstract":"A NOX sensor degradation detection system includes: a three-way catalyst disposed in an exhaust passageway of an internal combustion engine; a selective reduction catalyst disposed in the exhaust passageway downstream of the three-way catalyst; a NOX sensor disposed in the exhaust passageway downstream of the selective reduction catalyst; and a controller configured to execute a rich-shift process that is a process for causing air/fuel ratio of exhaust gas that flows into the three-way catalyst to become rich, and to determine that the NOX sensor has degraded on a condition that a measurement value from the NOX sensor does not reach nor exceed a threshold value within a prescribed time that follows start of the rich-shift process. A degradation detection method for use in the system is also provided."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Degradation detection system for NOx sensor, and degradation detection method therefor","description":"A NOX sensor degradation detection system includes: a three-way catalyst disposed in an exhaust passageway of an internal combustion engine; a selective reduction catalyst disposed in the exhaust pass","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8485015","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8485015","citation_suggestion":"Patentable. \"Degradation detection system for NOx sensor, and degradation detection method therefor\" (US-8485015). https://patentable.app/patents/US-8485015","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8485015","json":"https://patentable.app/api/llm-context/US-8485015","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T09:17:20.941Z"}