Mode switching control system and method of hybrid power AT transmission

The invention discloses a mode switching control system and method for a hybrid AT (automatic transmission), and the method comprises the steps that a TCU (transmission control unit) receives an HCU (hybrid control unit) mode switching instruction and feeds back the actual states of a power chain and a clutch to the HCU; the EMS control unit collects rotating speed and torque signals of an engine, sends the rotating speed and torque signals to the TCU and HCU control unit and responds to rotating speed and torque requests; the MCU collects motor rotating speed and torque signals, sends the motor rotating speed and torque signals to the TCU and HCU control units and responds to rotating speed and torque requests; the BMS control unit collects a battery electric quantity signal and sends the battery electric quantity signal to the HCU control unit; the HCU performs information interaction with a driver, the BMS, the TCU, the EMS and the MCU, judges and sends a mode switching instruction, controls opening and cl