Drive system for an industrial truck with an internal combustion engine

Drive system for an industrial truck comprising an internal combustion engine, a four-shaft epicyclic gearing comprising two or one fixed links with which a first shaft may be connected to a shaft of the internal combustion engine, a first electric motor which is mechanically coupled to a second shaft of the four-shaft epicyclic gearing and is electrically connected to an onboard power supply of the vehicle, a brake coupled to a fourth shaft of the four-shaft epicyclic gearing, a change gear coupled to a third shaft of the four-shaft epicyclic gearing, an output shaft of the change gear being connected to a second electric motor connected electrically to the onboard power supply and the output shaft of the change gear being coupled to at least one driven wheel of the industrial truck, at least one consumer for at least one additional function of the vehicle which is coupled to one of the shafts of the epicyclic gearing, a sensor device which detects the speed of the internal combustion engine and the first and second electric motor and generates corresponding signals, and a control and regulating device which controls or regulates the speeds and/or torques of the electric motors and the internal combustion engine according to setpoint signals of a set value generator actuated by the operator of the industrial truck and by taking as a basis the output signals of the sensor device, switches the motor operation or generator operation of the electric motors and controls the actuation of the change gear and the brake.