{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8512531","patent":{"patent_number":"US-8512531","title":"Gas concentration detection apparatus","assignee":null,"inventors":[],"filing_date":"2009-02-10T00:00:00.000Z","publication_date":"2013-08-20T00:00:00.000Z","cpc_codes":["G01N","G01N"],"num_claims":19,"abstract":"The present invention relates to a gas concentration detection apparatus for detecting the concentration of a specific gas component in an exhaust gas emitted from an engine, and forms a deterioration judgment about the gas concentration detection apparatus accurately and immediately. After excess oxygen is discharged by an oxygen pump cell 2, a NOx concentration detection apparatus, judges whether a NOx sensor 1 is activated. If the NOx sensor 1 is not activated yet, an output increase rate Vu(t) of the NOx sensor cell output N during an increase process of the NOx sensor cell output N is acquired. The present invention judges whether the output increase rate Vu(t) is lower than a predetermined reference value Vth1. If the obtained judgment result indicates that Vu(t)<Vth1, the NOx sensor cell 4 is deteriorated."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Gas concentration detection apparatus","description":"The present invention relates to a gas concentration detection apparatus for detecting the concentration of a specific gas component in an exhaust gas emitted from an engine, and forms a deterioration","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8512531","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-8512531","citation_suggestion":"Patentable. \"Gas concentration detection apparatus\" (US-8512531). https://patentable.app/patents/US-8512531","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8512531","json":"https://patentable.app/api/llm-context/US-8512531","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T15:39:57.667Z"}