An apparatus for controlling ignition timing during a shift in a vehicular automatic
transmission is provided that is capable of suppressing shift shock in the event
that input torque of the automatic transmission is affected by external changes,
such as changes in fuel and air pressure and the like, by adjusting immediately
to those changes. This control apparatus is provided with an ignition timing controller
that controls an ignition timing retard amount; a calculator that calculates a
basic retard amount; a detector that detects an engine retard amount; a determinator
that determines a retard correction value based on a shift mode of the automatic
transmission and the like; and a corrector that corrects the ignition timing retard
amount of the controller based on the retard correction value, the basic retard
amount, and the engine retard amount.