Method for operating a drive train

A method of operating a drive train of a motor vehicle, wherein the drive train comprises at least one hybrid drive having an internal combustion engine and an electric motor, a clutch being connected between the internal combustion engine and the electric motor, and an automatic transmission being located between the hybrid drive and an output, the method comprising the steps of:

• reducing torque transmitted by the internal combustion engine to substantially zero;
• reducing torque transmitted through the clutch connected between the internal combustion engine and the electric motor;
• disengaging the clutch connected between the internal combustion engine and the electric motor;
• transmitting torque to the transmission via the electric motor;
• reducing the torque transmitted to the transmission by the electric motor to substantially zero;
• initiating and completing a gear shift in the automatic transmission while torque transmission from the electric motor substantially zero;
• increasing the torque transmitted through the clutch connected between the internal combustion engine and the electric motor;
• and
• increasing the torque transmitted by the internal combustion engine and engaging the clutch connected between the internal combustion engine and the electric motor.

A method of operating a drive train of a motor vehicle, wherein the drive train comprises at least one hybrid drive having an internal combustion engine and an electric motor, a clutch being connected between the internal combustion engine and the electric motor, and an automatic transmission being located between the hybrid drive and an output, the method comprising the steps of:

• reducing torque transmitted to the transmission by the internal combustion engine and commencing transmission of torque to the transmission by the electric motor;
• reducing torque transmitted through the clutch connected between the internal combustion engine and the electric motor;
• ceasing transmission of torque from the internal combustion engine to the transmission before disengagement of the clutch;
• disengaging the clutch connected between the internal combustion engine and the electric motor;
• reducing the torque transmitted to the transmission by the electric motor to substantially zero;
• performing a gear shift in the automatic transmission;
• commencing transmission of torque to the transmission via the electric motor before increasing the torque transmitted through the clutch;
• increasing the torque transmitted through the clutch connected between the internal combustion engine and the electric motor;
• increasing the torque transmitted by the internal combustion engine and reducing the torque transmitted by the electric motor;
• and
• engaging the clutch connected between the internal combustion engine and the electric motor.