Patent ID: 8930099
Filing Date: 2015-01-06
Classification: F02D,F16H,Y10T

Abstract:
1. An apparatus for controlling an automatic transmission that changes speed of an output of an engine mounted on a vehicle through a frictional engaging element, comprising: an input rotational speed detector adapted to detect an input rotational speed of the automatic transmission; an output rotational speed detector adapted to detect an output rotational speed of the automatic transmission; an output rotational speed change amount calculator adapted to calculate a change amount of the output rotational speed; an output rotational speed change amount average calculator adapted to calculate an average of the change amount of the output rotational speed over a predetermined period of an initial inertia phase of shifting defined based on a ratio of the detected input rotational speed to the detected output rotational speed; a steady state determiner that determines whether the vehicle is in a steady state; a vehicle acceleration average calculator adapted to: a difference calculator adapted to calculate a difference between the average of the change amount of the output rotational speed and the average of the vehicle acceleration; a learning value calculator adapted to calculate a learning value used for incrementally or decrementally correcting a desired value of transmission torque of the frictional engaging element such that the calculated difference falls within a predetermined range; a corrector adapted to incrementally or decrementally correct the desired value of the transmission torque of the frictional engaging element with the calculated learning value; and a hydraulic supply controller adapted to control supply of hydraulic pressure to the frictional engaging element such that the transmission torque becomes the corrected desired value.