The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2016
Filed:
Jan. 07, 2015
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
Abnormality diagnosis device for a variable valve mechanism configured to open an exhaust valve even during an intake stroke and capable of selecting a first mode wherein the exhaust valve only opens during an exhaust stroke, or a second mode wherein the exhaust valve opens during both an exhaust stroke and an intake stroke. The abnormality diagnosis by the device determines the mechanism is abnormal when a difference between an exhaust gas returning amount calculated to recirculate from an exhaust passage into a cylinder in the second mode based on intake air amounts in the first and second modes, and an exhaust gas returning amount estimated to recirculate from an exhaust passage in the second mode based on an exhaust gas pressure, exceeds a diagnosis threshold value. The higher an exhaust gas pressure is, the larger an exhaust gas returning amount is estimated to be.