Apparatus for controlling a vehicle drive system including an automatic
transmission, including a feedback controller operable upon a shift-down
action of the transmission effected by concurrent releasing and engaging
actions of first and second frictional coupling devices during an
operation of a manually operable vehicle accelerating member to drive the
vehicle with the drive power soruce, for controlling an engaging force of
the first frictional coupling device, and a learning compensator operable
upon detection of an abnormality of the shift-down action, for learning
compensation of an initial value of the engaging force at which a feedback
control of the engaging force is initiated, or an output reducing device
for reducing an output of a drive power source when input speed of the
transmission has been increased to a value close to a synchronization
value, and/or upon racing of the drive power source during the shift-down
action.
