{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9669678","patent":{"patent_number":"US-9669678","title":"Vehicle state detection device","assignee":null,"inventors":[],"filing_date":"2012-12-11T00:00:00.000Z","publication_date":"2017-06-06T00:00:00.000Z","cpc_codes":["B60W","B60W","G01D","B60W","B60W"],"num_claims":11,"abstract":"An unsprung state detection part (140) calculates a variation amount X (=|φ−φ′|), which is a magnitude of a difference between a detected angle φ output from a resolver rotational angle sensor (40) for detecting a rotational angle of an in-wheel motor (30) and an estimated angle φ′ of a motor rotational angle (S11 to S13). The estimated angle φ′ can be calculated by adding an estimated angle of the rotation of the motor (30) in one calculation cycle to a detected angle φn−1 of the previous calculation cycle. When the variation amount X is more than a road surface determination threshold Xref, the unsprung state detection part (140) determines that the travel road on which a vehicle (1) is traveling is a rough road (S14, S15). As a result, the road surface determination can be made by using the rotational angle sensor (40)."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Vehicle state detection device","description":"An unsprung state detection part (140) calculates a variation amount X (=|φ−φ′|), which is a magnitude of a difference between a detected angle φ output from a resolver rotational angle sensor (40) fo","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9669678","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-9669678","citation_suggestion":"Patentable. \"Vehicle state detection device\" (US-9669678). https://patentable.app/patents/US-9669678","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9669678","json":"https://patentable.app/api/llm-context/US-9669678","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T05:03:01.425Z"}