Shift control device of vehicular automatic transmission

Details Shift control device of vehicular automatic transmission Shift control device of vehicular automatic transmission

2006-11-21

2010-06-22

Le, David D (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Engine ignition control for transmission change

Reexamination Certificate

active

07740559

ABSTRACT:
A shift control device of a vehicular automatic transmission, if during a first shift in a power-off state, a second shift judgment for a second shift that is a power-on downshift is made, performs a second shift control of lowering an input shaft rotation speed to a synchronous rotation speed of a post-second shift gear step through an engagement control of the friction engagement devices, and when the second shift is performed, performs a control of reducing a throttle valve opening degree of the engine to a predetermined degree that causes the engine to output a torque that is able to bring the input shaft rotation speed to a rotation speed that is higher than the synchronous rotation speed of the post-second shift gear step. The control device also executes a retardation control of retarding an ignition timing of the engine when the input shaft rotation speed is dropped through the second shift control.

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