Open and closed circuit parallel drive system and control method based on a four-chamber hydraulic cylinder

An open and closed circuit parallel drive system based on a four-chamber hydraulic cylinder, comprising the four-chamber hydraulic cylinder and a hydraulic control system, wherein the hydraulic control system comprises a closed pump-controlled drive unit and an open valve-controlled drive unit,

• wherein a first oil port of the closed pump-controlled drive unit is connected to a second oil port of the four-chamber hydraulic cylinder, and a second oil port of the closed pump-controlled drive unit is connected to a first oil port of the four-chamber hydraulic cylinder;
• and the closed pump-controlled drive unit is configured to drive and control an operating velocity and displacement of the four-chamber hydraulic cylinder with a first load power;
• and
• a first oil port of the open valve-controlled drive unit is connected to a fourth oil port of the four-chamber hydraulic cylinder, and a second oil port of the open valve-controlled drive unit is connected to a third oil port of the four-chamber hydraulic cylinder;
• the open valve-controlled drive unit is configured to drive the four-chamber hydraulic cylinder with a second load power;
• and
• the second load power is greater than the first load power.