Electro-hydraulic hybrid transmission control method and system for roller-changing cart

The invention discloses an electro-hydraulic hybrid transmission control method and system for a roller-changing cart. The method comprises the following steps of driving a hydraulic motor to advance and driving the hydraulic motor to retreat, wherein the step of driving the hydraulic motor to advance comprises a B-end valve closing stage and a motor advancing regulation stage; and the step of driving the hydraulic motor to retreat comprises an A-end valve closing stage and a motor retreating regulation stage. The system comprises a transmission device and a control device, wherein the transmission device comprises a hydraulic motor arranged on a base, an output shaft of the hydraulic motor is connected with a UCP210 bearing through a coupler, keys are arranged among the hydraulic motor, the coupler and the UCP210 bearing, the UCP210 bearing is arranged at the front end of a gear shaft, a UCP205 bearing is arranged at the rear end of the gear shaft, and the UCP210 bearing is connected with the UCP205 bearing;