Hybrid power transmission system, control method and automobile

The invention discloses a transmission system, a control method and an automobile of a hybrid electric vehicle, belonging to the technical field of the hybrid electric vehicle. The system comprises anengine, a first electric machine, a second electric machine, a planetary gear train, a first rotating shaft, a second clutch, a third clutch, a ring gear engagement member and a battery pack. The planetary gear train comprises a planet carrier, a sun gear, a planet gear and a ring gear, wherein the sun gear and the ring gear are arranged on the planet carrier, the outer ring gear of the sun gearis meshed with the inner ring gear of the planet gear, and the ring gear is meshed with the outer ring gear of the planet gear; the engine is connected to one end of the first rotating shaft; one endof the first motor is connected with the ring gear through the ring gear engaging member, and the other end is connected with the battery pack; one end of the second motor is connected with the secondclutch, and the other end i