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Control apparatus and method for an automatic transmission of a vehicle

Image Number 2 for United States Patent #6254512.

Control apparatus having improved characteristics at an early stage of changing the gear position which make it possible to clearly discriminate the change in the transmission input shaft revolution speed caused by a rise in the engine torque by depressing the accelerator pedal from changes attending on the disengagement of the disengaging side clutch. For the above purpose, the control apparatus adopts a configuration capable of correcting the oil pressure acting on the friction coupling device by an arrangement that the transmission output shaft revolution ratio, obtained from the transmission output shaft revolution speed and the transmission input shaft revolution speed, follows up the target value of the revolution ratio after a speed change signal is issued.

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