Novel closed pump control asymmetric cylinder system of electric engineering machinery

The invention provides a novel closed pump-controlled asymmetric cylinder system which can recover energy of the system under a load working condition, and the energy is generated by a bidirectional hydraulic pump motor and a bidirectional variable-speed servo motor and is supplied to an electric energy storage unit for energy storage; under the reverse load working condition, the electric energy storage unit supplies power to the bidirectional variable-speed servo motor and the bidirectional hydraulic pump motor for energy utilization. Meanwhile, the third hydraulic cavity of the asymmetric hydraulic cylinder of the system is directly connected with a small closed pump control system, energy recovery and utilization are conducted through independent control, meanwhile, the small closed pump control system can be independently driven to actively control flow and pressure to assist in controlling an asymmetric hydraulic cylinder actuator according to working conditions, and therefore the use performance of the