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. 27, 2013
Filed:
Apr. 11, 2008
Koji Hayashi, Aichi-gun, JP;
Masatoshi Ito, Okazaki, JP;
Takeshi Kanayama, Toyota, JP;
Tsuyoshi Mikami, Nisshin, JP;
Koji Hayashi, Aichi-gun, JP;
Masatoshi Ito, Okazaki, JP;
Takeshi Kanayama, Toyota, JP;
Tsuyoshi Mikami, Nisshin, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
Due to the reduction of a discharge amount of a mechanical oil pump by a lowering of the idling rotation speed, a slip in a hydraulic power transmission apparatus and a blow up of an electric motor for running due to a delay of the rising of the oil pressure upon the sudden start and the like are prevented. While avoiding the slip and the blow up, the idling rotation speed is lowered so as to make the engine noise small. When the return determination from the idling state is performed based on the shift operation from P to D, at step S, a torque TMGof a second motor/generator MGis temporarily restricted. As a result, upon the sudden start from the idling state, even when the rising of the oil pressure delays, the second brake Bengaged upon the starting is prevented from slipping, and the second motor/generator MGis prevented from blowing up. As a result, while avoiding the slip of the second brake Band the blow up of the second motor/generator MGdue to the hydraulic response delay, an idling rotation speed N Eidl is lowered so that the engine noise can be reduced.