Patent ID: 6921984

Claim:
A drive system for an industrial truck, comprising an internal combustion engine ( 10 ), a three-shaft epicyclic gearing ( 12 ) adapted to be connected to the shaft of the internal combustion engine ( 10 ), a first electric motor ( 14 ) which is mechanically coupled to the second shaft of the epicyclic gearing ( 12 ) and is connected to an onboard network of the industrial truck, a change-speed gearing ( 26 ) coupled to the third shaft of the epicyclic gearing ( 12 ), a summing gearbox coupled to the change-speed gearing the other input shaft of which is connected to a second electric motor ( 22 ) which is electrically connected to the onboard network and the output shaft ( 24 ) of which is coupled to at least one driven wheel of the industrial truck, a clutch (A) between the first and second shafts of the epicyclic gearing ( 12 ), at least one consumption unit ( 30 ) for an additional function of the industrial truck that is coupled to one of the shafts of the epicyclic gearing ( 12 ), a sensor device which measures the speeds of the internal combustion engine ( 10 ), the first and second electric motors ( 14 , 22 ), and the driving wheel and generates respective signals, and a control and regulation device ( 34 ) which controls or regulates the speeds of the electric motors ( 14 , 22 ) and internal combustion engine ( 10 ), and controls the motor or generator operation of the electric motors ( 14 , 22 ) and the actuation of the clutch (A) and change-speed gearing ( 26 ) in response to set-point signals ( 36 ) from the set-point transmitters actuated by the operator of the industrial truck and on the basis of the output signals of the sensor device.