| US 7,563,198 B2 | ||
| Shift control device and shift control method of automatic transmission | ||
| Atsushi Ayabe, Nagoya (Japan); Toshio Sugimura, Nagoya (Japan); Ayumu Sagawa, Toyota (Japan); Takahiko Tsutsumi, Toyota (Japan); Hisashi Ishihara, Toyoake (Japan); Kazuhiro Iketomi, Nagoya (Japan); and Yosuke Takaie, Toyota (Japan) | ||
| Assigned to Toyota Jidosha Kabushiki Kaisha, Aichi-ken (Japan) | ||
| Filed on Nov. 22, 2006, as Appl. No. 11/603,202. | ||
| Claims priority of application No. 2005-338943 (JP), filed on Nov. 24, 2005. | ||
| Prior Publication US 2007/0117676 A1, May 24, 2007 | ||
| Int. Cl. F16H 61/26 (2006.01) | ||
| U.S. Cl. 477—132 [477/135; 477/139; 477/140] | 12 Claims |
| 1. A shift control device of a vehicular automatic transmission that establishes a plurality of gear steps of different speed
change ratios by selectively engaging a plurality of friction engagement devices, comprising:
a first controller that performs a shift control for causing execution of a downshift through engagement switch between a
release-side friction engagement device and an engagement-side friction engagement device; and
a second controller that ends the shift control by making an engagement end determination regarding the engagement-side friction
engagement device if it has been determined for a predetermined time that an input shaft rotation speed of the automatic transmission
is in a vicinity of a synchronous rotation speed of a post-shift gear step,
wherein the second controller sets the predetermined time at a first time if the downshift is a power-on downshift due to
a shift judgment in a power-on state, and
wherein the second controller sets the predetermined time at a second time that is shorter than the first time if the downshift
is a power-off→on downshift selected in connection with a change to the power-on state during a power-off shift due to the
shift judgment in a power-off state.
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