Transmission unit for a motor vehicle and control method therefor

A transmission unit for a motor vehicle, comprising:

• a drive shaft (11) for a connection to an internal combustion engine of the motor vehicle;
• an output shaft (15) for the driving of the motor vehicle;
• a change speed gearbox (21);
• an additional drive motor (23);
• and
• a planetary transmission (25),
• wherein the additional drive motor (23) is coupled to a first part (35) of the planetary transmission and the output shaft is coupled to a second part (37) of the planetary transmission,
• characterized in that
• the output shaft (15) of the transmission unit is operationally coupled to a planetary carrier (37) of the planetary transmission, with the additional drive motor (23) being coupled to a sun gear (35) of the planetary transmission and the drive shaft being able to be coupled to an annulus gear (39) of the planetary transmission—or vice versa.

A method for the control of a transmission unit of a motor vehicle which has:

• a drive shaft (11) connected to an internal combustion engine of the motor vehicle;
• an output shaft (15) for the driving of the motor vehicle;
• a change speed gearbox (21);
• an additional drive motor (23);
• and
• a planetary transmission (25),
• wherein the additional drive motor (23) is coupled to a first part (35) of the planetary transmission and the output shaft is coupled to a second part (37) of the planetary transmission,
• characterized in that
• a previously selected gear stage (2, 4, 6) of the change speed gearbox is only released for at least one gear change when a gear stage (3, 5) of the change speed gearbox to be selected next has likewise already been selected,
• with the respective one gear stage (3, 5) establishing a direct connection of the drive shaft (11) of the transmission unit to the output shaft (15) and the respective other gear stage (2, 4, 6) establishing an indirect connection of the drive shaft (11) to the output shaft (15) via a third part (39) of the planetary transmission—or vice versa.

A method for the control of a transmission unit of a motor vehicle which has:

• a drive shaft (11) connected to an internal combustion engine of the motor vehicle;
• an output shaft (15) for the driving of the motor vehicle;
• a change speed gearbox (21);
• an additional drive motor (23);
• and
• a planetary transmission (25),
• characterized in that
• previously selected gear stage (2, 4, 6) of the change speed gearbox is only released for at least one gear change when a gear stage (3, 5) of the change speed gearbox to be selected next has likewise already been selected, with at least some of the driving torque of the internal combustion engine being transmitted to the planetary transmission (25) via the change speed gearbox (21) during the gear change and a torque of the additional drive motor (23) additionally being transmitted to the planetary transmission (25) and with a summarized torque of the internal combustion engine and of the additional drive motor being transmitted to the output shaft (15) of the transmission unit via the planetary transmission during the gear change.