Motor vehicle comprising at least two drive motors and comprising an automatic gearbox having a fixed gear ratio and a power-split gear ratio
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorSebastian Liebert
Life of this patent
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Abstract
A motor vehicle includes at least two drive motors, an automatic gearbox, and an electronic control unit, which, during a gear ratio adjustment between an engagement and a loading of a shift element, causes the shift element to be loaded with a predefined torque gradient at a first point in time at which at least one tooth-to-tooth position exists, up to a second point in time, cause the predefined torque to be limited to a maximum permissible torque during a predefined waiting period from the second point in time up to a third point in time, and cause the shift element to be further loaded with the previously predefined torque gradient after the waiting period or when the engaged state is detected.
Claims20
A motor vehicle comprising:
- at least two drive motors, wherein at least one drive motor is an electric machine;
- a high-voltage battery;
- an automatic gearbox comprising:
- at least one fixed gear ratio and at least one power-split gear ratio (E-CVT);
- and/or
- at least one serial gear ratio for gear ratio adjustment towards the at least one fixed gear ratio;
- and
- an electronic control unit configured to, during a ratio adjustment between an engagement of a shift element and a loading of the shift element, in order to control an internal combustion engine and the electric machine:
- cause the shift element to be loaded with a predefined torque gradient at a first point in time at which at least one tooth-on-tooth position exists up to a second point in time;
- cause the predefined torque to be limited to a maximum permissible torque during a predefined waiting period from the second point in time up to a third point in time;
- and
- cause the shift element to be further loaded with the previously defined torque gradient after the waiting period or when an engaged state is detected.
An electronic control unit for a motor vehicle or an automatic gearbox, the electronic control unit configured to:
- during a ratio adjustment between an engagement of a shift element and a loading of the shift element:
- cause the shift element to be loaded with a predefined torque gradient at a first point in time at which at least one tooth-on-tooth position exists up to a second point in time;
- cause the predefined torque to be limited to a maximum permissible torque during a predefined waiting period from the second point in time up to a third point in time;
- and
- causing the shift element to be further loaded with the previously defined torque gradient after the waiting period or when an engaged state is detected.
A method for shifting an automatic gearbox in a motor vehicle, the method comprising:
- during a gear ratio adjustment between an engagement of a shift element and a loading of the shift element, in order to control an internal combustion engine and an electric machine:
- loading the shift element with a predefined torque gradient at a first point in time at which at least one tooth-on-tooth position exists, up to a second point in time;
- limiting the predefined torque to a maximum permissible torque during a predefined waiting period from the second point in time up to a third point in time;
- and
- further loading the shift element with the previously defined torque gradient after the waiting period or when an engaged state is detected.
Dependencies are inferred from the claim text.