Patent ID: 11965584
Assignee: NUOVO PIGNONE TECNOLOGIE-SRL
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A method for operating a train system, the train system comprising a power source, a drive arrangement comprising an input shaft connected to the power source, an output shaft, and a hybrid gear box having a layshaft gear box connected to the input shaft and the output shaft, a star carrier configured to adjust a transmission speed ratio of the layshaft gearbox between the input shaft and the output shaft, and a speed ratio motor-generator unit configured to control the rotation of the star carrier,
the method comprising the steps of:
operating the speed ratio motor-generator unit to start up the power source;
transmitting power generated by the power source through the drive arrangement to a load connected to the output shaft; and,
at a pre-determined speed for the power source,
switching off the speed ratio motor-generator unit to decouple the load from the power source and place the star carrier in its free spinning mode, and
adjusting speed and torque at the output shaft by operating the speed ratio motor-generator unit as a generator to slow down the star carrier from its free spinning mode to increase the output shaft speed from a stand-still condition.