Control apparatus for automatic transmission

摘要

In a control apparatus for an automatic transmission, it is configured to calculate a change amount (ΔNC estimation value) of an output rotational speed of the transmission (S10); calculate an average (I phase initial average G) of the change amount of the output rotational speed over a predetermined period of an initial inertia (I) phase of shifting; calculate an average (after-shift average G) of a vehicle acceleration after the completion of the shifting, assuming that the change amount of the output rotational speed indicates the vehicle acceleration G; calculate a difference (I phase initial G) between the average of the change amount of the output rotational speed and the average of the vehicle acceleration; incrementally and decrementally correct the desired value of the transmission torque of the frictional engaging element such that the calculated difference falls within a predetermined range; and control supply of hydraulic pressure to the frictional engaging element such that it becomes the corrected desired value (S14 to S20). With this, since the vehicle acceleration at shifting is estimated and evaluated and based thereon, variation in the transmission torque of the frictional engaging element, etc., is learned, it becomes possible to fully exploit the potential of the frictional engaging element, thereby improving a feel given to the vehicle occupant(s) at shifting.

主权项

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:
determine completion of the shifting based on a ratio of the input rotational speed to the output rotational speed, andcalculate an average of a vehicle acceleration after the completion of the shifting based on the change amount of the output rotational speed, when the change amount of the output rotational speed indicates the vehicle acceleration and the vehicle is in the steady state; 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.