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:
Jan. 27, 2015
Filed:
Sep. 14, 2012
Kentaro Mikawa, Isesaki, JP;
Kentaro Mikawa, Isesaki, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
Even when a crankshaft reversely rotates, a rotation phase of a camshaft can be accurately detected. A motor shaft rotation angle, a crankshaft forward rotation angle, a crankshaft reverse rotation angle, a final crankshaft rotation angle, a sprocket rotation angle of an electric VTC where a sprocket rotates at ½ rotation speed of the crankshaft and a stator of an electric motor are integrally rotated, a motor shaft rotation angle changing amount during a control period, a sprocket rotation angle changing amount, a motor shaft rotation angle changing amount, an intake camshaft rotation angle changing amount, and a current real rotation angle of the intake camshaft are calculated sequentially, and the VTC manipulated variable is computed so that the VTC real angle follows a VTC target angle.