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:
Aug. 18, 2009
Filed:
Feb. 14, 2008
Koki Minamikawa, Toyota, JP;
Koki Minamikawa, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A motor-generator is feedback-controlled by adopting the rotation speed information from a resolver when the rotation speed of a motor-generator is low, and by adopting the rotation speed information from a north marker when the rotation speed thereof is high. If the gradient of change in the rotation speed thereof based on the presently adopted rotation speed information is greater than or equal to a predetermined value, the rotation speed information switching operation is prohibited to prevent the shift shock during the ratio shifting operation of a reduction mechanism. That is, in a construction in which the rotation speed of the motor-generator can be detected via the resolver and the north marker, the power output device capable of properly performing the rotation speed control of the motor-generator and the like by making proper the timing at which the rotation speed information adopted for the control is switched.