	US 7,578,766 B2
	Apparatus and method for controlling automatic transmission
Masato Watanabe, Nagoya (Japan); and Masahito Kaigawa, Toyota (Japan)
Assigned to Toyota Jidosha Kabushiki Kaisha, Aichi-Ken (Japan)
Filed on Aug. 17, 2007, as Appl. No. 11/840,572.
Claims priority of application No. 2006-237506 (JP), filed on Sep. 01, 2006.
Prior Publication US 2008/0058159 A1, Mar. 06, 2008
Int. Cl. B60W 10/04 (2006.01)

U.S. Cl. 477—107 [477/110]

16 Claims

1. An apparatus for controlling an automatic transmission for a vehicle based on a learning correction value, wherein the learning correction value is determined in a manner that a maximum engine rotational speed approaches a target maximum engine rotational speed and the maximum engine rotational speed is an engine rotational speed to be reached during a predetermined time period after an upshift performed when a speed of the vehicle exceeds a preset shift point during power-on driving, the apparatus comprising:

a learning control unit that estimates an estimated maximum engine rotational speed of an engine by replacing the maximum engine rotational speed after the upshift in the power-on driving with the maximum engine rotational speed in a reference driving state that does not affect the acceleration of the vehicle, and calculating the learning correction value based on a deviation between the estimated maximum engine rotational speed and the target maximum engine rotational speed,

wherein the learning control unit comprises an estimated maximum engine rotational speed calculation unit that multiplies a deviation between an engine rotational speed at the up-shift point and the engine rotational speed at an inertia phase start point during the upshift by a ratio of an engine rotational acceleration in the reference driving state to an engine rotational acceleration at the up-shift point, and adds the multiplication result to the engine rotational speed at the up-shift point to provide the estimated maximum engine rotational speed.