Patent ID: 8180536

Claim:
An automatic transmission control apparatus for an automatic transmission in which a first friction engagement element is in a disengaged state and a second friction engagement element is in an engaged state when in a first target gear, and the first friction engagement element is in an engaged state and the second friction engagement element is in a disengaged state when in a second target gear, the automatic transmission control apparatus comprising: a sensor for obtaining an actual transmission gear ratio of the automatic transmission; and a controller connected to the sensor, and configured to: perform a first shift control of controlling a shift of the first friction engagement element from the engaged state into the disengaged state and a shift of the second friction engagement element from the disengaged state into the engaged state for a first gear shift of the automatic transmission from the second target gear to the first target gear; and perform a process during the first shift control, the process including: a first operation of setting a desired torque capacity of one of the first and second friction engagement elements on a basis of the actual transmission gear ratio by interpolation from values of the desired torque capacity corresponding to at least first and second reference transmission gear ratios, wherein the first reference transmission gear ratio is a transmission gear ratio at start of an inertia phase of the first shift control; and a second operation of setting the desired torque capacity to the value corresponding to the first reference transmission gear ratio, in response to determination that the first reference transmission gear ratio is between the actual transmission gear ratio and the second reference transmission gear ratio.