System and method of controlling automatic transmission

Details System and method of controlling automatic transmission System and method of controlling automatic transmission

2006-03-07

2006-03-07

Black, Thomas G. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S058000, C701S067000, C701S068000, C475S118000, C475S120000, C475S125000, C475S127000, C477S080000, C477S127000

Reexamination Certificate

active

07010405

ABSTRACT:
A shift control system for an automatic transmission wherein shifting from a first gear ratio to a second gear ratio is carried out by releasing the hydraulic pressure of a first friction engaging element for disengagement thereof and supplying the hydraulic pressure to a second friction engaging element for engagement thereof, the hydraulic pressure to the second friction engaging element being subjected to feedback control, wherein the shift control system includes a sensor for sensing a parameter on a vehicle cruising condition; and an ECU having a part for calculating, in accordance with the sensed parameter, a difference in output-side rotational speed of the fluid coupling before and after the shifting; and a part for setting, when the shifting is carried out with an output of the engine being smaller than a predetermined value, the second hydraulic pressure in accordance with the calculated difference immediately before start of the feedback control.

REFERENCES:
patent: 5115695 (1992-05-01), Wakahara et al.
patent: 8-93905 (1996-04-01), None
patent: 8-145157 (1996-06-01), None

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