Hybrid-vehicle drive system and operation method with a transmission

A hybrid-vehicle drive method and system includes an internal combustion engine (1) that includes an output shaft (2), a first electric motor/generator (8) connected to the output shaft of the internal combustion engine via a power distribution mechanism (3), a wheel drive shaft (11) connected to the output shaft of the internal combustion engine via the power distribution mechanism, a second electric motor/generator (12) connected to the wheel drive shaft, and a transmission (100, 101, 102) located on at least one of the wheel drive shaft and a connecting portion of the second electric motor/generator with the wheel drive shaft.