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:
Apr. 12, 2016
Filed:
Feb. 22, 2012
Naoki Itazu, Nagoya, JP;
Toshiya Yamashita, Toyota, JP;
Yoichi Nakashima, Nisshin, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-Shi, JP;
Abstract
A control device of a power transmission device includes a damper absorbing torsional vibration between a fluid transmission device with a lockup clutch and an engine, the power transmission device is disposed with a connecting/disconnecting device capable of connecting and interrupting power transmission on the downstream side of the fluid transmission device, the control device has a lockup engagement control means engaging the lockup clutch while the power transmission is interrupted by the connecting/disconnecting device in a predetermined engine rotation speed range lower than an idle rotation speed when the engine is started, the lockup engagement control means includes: a resonance due to frequency entrainment determination means determining whether a resonance due to frequency entrainment occurs that blocks an increase in an engine rotation speed NE depending on whether a predefined resonance determination time is exceeded by a required start time of the engine or an elapsed time until the engine rotation speed NE reaches a predetermined rotation speed; a lockup engagement means engaging the lockup clutch while the power transmission is interrupted by the connecting/disconnecting device when the resonance due to frequency entrainment determination means determines that the resonance due to frequency entrainment occurs.