US 9,810,321 B2
Control apparatus for power transmission system
Kazuaki Nakamura, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, Aichi-ken (JP)
Filed on Jul. 26, 2016, as Appl. No. 15/219,936.
Claims priority of application No. 2015-157742 (JP), filed on Aug. 7, 2015.
Prior Publication US 2017/0037966 A1, Feb. 9, 2017
Int. Cl. B60W 30/20 (2006.01); F16H 61/70 (2006.01); F16H 37/02 (2006.01); F16H 61/662 (2006.01); F16H 61/02 (2006.01)
CPC F16H 61/702 (2013.01) [B60W 30/20 (2013.01); F16H 37/021 (2013.01); F16H 37/022 (2013.01); F16H 61/0204 (2013.01); F16H 61/662 (2013.01); F16H 61/66259 (2013.01); B60Y 2300/20 (2013.01); F16H 2702/02 (2013.01); F16H 2702/06 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A control apparatus for a power transmission system, the power transmission system including an automatic transmission configured to transmit power of a driving force source to a drive wheel and selectively establish one of a first power transmission path and a second power transmission path, the control apparatus comprising:
an electronic control unit configured to:
(i) determine whether a state of a vehicle is a predetermined state of the vehicle where a vibration of the vehicle occurs,
(ii) when the state of the vehicle is the predetermined state of the vehicle while the vehicle is traveling in a state where the first power transmission path is established, half-engage an engagement device configured to establish the second power transmission path while the first power transmission path remains established, and
(iii) when the state of the vehicle is the predetermined state of the vehicle while the vehicle is traveling in the state where the first power transmission path is established, alternatively set, in response to a traveling state of the vehicle, a speed ratio of the second power transmission path to one of a lower vehicle speed-side speed ratio with respect to a speed ratio of the first power transmission path and a higher vehicle speed-side speed ratio with respect to the speed ratio of the first power transmission path.