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US Patent 7396316 Control device for vehicular drive system

Patent 7396316 was granted and assigned to Toyota on July, 2008 by the United States Patent and Trademark Office.

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Patent attributes

Current Assignee
Toyota
Toyota
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7396316
Date of Patent
July 8, 2008
Patent Application Number
11092819
Date Filed
March 30, 2005
Patent Primary Examiner
‌
Tisha D Lewis
Patent abstract

Hybrid controller 52 for a vehicular drive system is operable during a shifting control of step-variable transmission portion 20 for a stepping change of its speed ratio, for changing a speed ratio of continuously-variable transmission portion 11, such that total speed ratio γT of transmission mechanism 10 defined by the speed ratio of the continuously-variable transmission portion 11 and the speed ratio of the step-variable transmission portion 20 is continuously changed, irrespective of the stepping change of the speed ratio of the step-variable transmission portion 20, so that an amount of stepping change of engine speed NE before and after a shifting action of the step-variable transmission portion 20 is reduced, and a shifting shock of the step-variable transmission portion 20 is reduced. The hybrid controller 52 permits the transmission mechanism 10 to function as a continuously variable transmission, thereby improving fuel economy of the vehicular drive system.

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