Method for changing from electrical operation to hybrid operation in a vehicle hybrid drive and vehicle hybrid drive

A vehicle hybrid drive having a control device comprising:

• an interface for an input element;
• and
• a starting device for starting an internal combustion engine,
• wherein the control device is connected to actuators which adjust a power that is received or output by components of a vehicle electrical system, and
• wherein the control device executes a method for changing from electrical operation to hybrid operation in the vehicle hybrid drive, the method comprising:
• (a) detecting an increase in a target traction power that is detected via an input element;
• (b) starting the internal combustion engine;
• (c) when the internal combustion engine starts, outputting a positive torque by way of generating an increasing generator power by a generator device, wherein the generator power is used together with an electrical power of a vehicle-side electrical storage unit for generating electrical traction power, wherein the generator power (LG) is generated while the internal combustion engine is not yet or not yet fully coupled to an output;
• (d) fully coupling the internal combustion engine to the output after the generation of the increasing generator power has begun;
• and
• (e) after the internal combustion engine has been fully coupled to the output:
• reducing the electrical power of the storage unit that is used for electrical traction to a non-positive value, and
• adjusting the generator power in accordance with a predetermined energy balance.