Vehicle gear-shifting control apparatus

A vehicle gear-shifting control apparatus, comprising:

• an engine which is mounted to a vehicle and which generates a travel drive force of the vehicle;
• a motor which generates another travel drive force of the vehicle and which supplies a battery with regenerative energy during deceleration of the vehicle;
• an automatic transmission of which an input shaft is connected to the engine and the motor and an output shaft is connected to a rear wheel and which subjects an input rotation to gear-shifting at a transmission gear ratio corresponding to a selected shift stage and outputs the gear-shifted input rotation;
• a friction brake system which distributes a braking force to a front wheel and the rear wheel in order to realize braking in accordance with a brake pedal operation by a driver;
• and
• a controller which executes, during deceleration of the vehicle during which the friction brake system is distributing the braking force to the front wheel and the rear wheel, a regeneration control of imparting a regenerative braking torque to the rear wheel by causing the motor to perform a regeneration operation and a gear-shifting control of changing the shift stage of the automatic transmission by outputting a gear-shifting signal in accordance with a rotation speed of the input shaft to the automatic transmission, wherein
• when the controller determines an oversteered state of the vehicle during the regeneration control, the controller increases an input torque of the input shaft of the automatic transmission so that the regenerative braking torque decreases while maintaining the regeneration operation of the motor and, at the same time, limits the gear-shifting control of the automatic transmission.