US 12,291,127 B2
Vehicle gear-shifting control apparatus
Makoto Yamada, Aki-gun (JP); Tooru Uematsu, Aki-gun (JP); and Atsushi Yamasaki, Aki-gun (JP)
Assigned to Mazda Motor Corporation, Hiroshima (JP)
Filed by Mazda Motor Corporation, Hiroshima (JP)
Filed on Mar. 24, 2023, as Appl. No. 18/189,800.
Claims priority of application No. 2022-062884 (JP), filed on Apr. 5, 2022.
Prior Publication US 2023/0347749 A1, Nov. 2, 2023
Int. Cl. B60L 7/26 (2006.01); B60L 15/20 (2006.01)
CPC B60L 7/26 (2013.01) [B60L 15/2009 (2013.01); B60L 15/2036 (2013.01); B60L 2240/20 (2013.01); B60L 2240/24 (2013.01); B60L 2240/48 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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 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 causing the automatic transmission to perform a downshift by outputting a downshift signal in accordance with a rotation speed of the input shaft to the automatic transmission, wherein
the controller increases an input torque of the input shaft of the automatic transmission according to the downshift so that an acceleration fluctuation of the vehicle which accompanies the downshift equals a target acceleration fluctuation, and
when the controller determines an oversteered state of the vehicle during the regeneration control and during the downshift, the controller increases the 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, the controller causes the automatic transmission to perform the downshift in a state where an amount of increase of the input torque of the input shaft in accordance with the downshift has been increased as compared to an amount of increase during a non-determination of an oversteered state.