Hydro-mechanical series and parallel transmission device and control method thereof

A hydro-mechanical series and parallel transmission device, characterized by comprising:

• an input shaft assembly (1), wherein the input shaft assembly (1) comprises an input shaft (11), a first clutch C1 (12), a linked intermediate gear set (13), and a fifth clutch C5 (14);
• a hydraulic transmission assembly (2), wherein the hydraulic transmission assembly (2) comprises a variable displacement pump (21), a fixed displacement motor (22), and a second clutch C2 (23), and the variable displacement pump (21) is connected to the input shaft (11) through the second clutch C2 (23);
• a planetary gear transmission assembly (3), wherein the planetary gear transmission assembly (3) comprises an outer ring gear (31), a planet carrier (32), a sun gear (33), and a sixth clutch C6 (34), the sixth clutch C6 (34) is connected to the sun gear (33), and the fifth clutch C5 (14) is connected to the outer ring gear (31);
• an intermediate gear transmission assembly (4), wherein the intermediate gear transmission assembly (4) comprises a first transmission gear (41), a second transmission gear (42), a third transmission gear (43), a fourth transmission gear (44), a third clutch C3 (45), a fourth clutch C4 (46), and a brake B1 (47), the first transmission gear (41) is fixedly connected to an output shaft of the fixed displacement motor (22), the first transmission gear (41) meshes with the second transmission gear (42), the second transmission gear (42) is connected to the third transmission gear (43) through the fourth clutch C4 (46), the third transmission gear (43) meshes with the fourth transmission gear (44), the fourth transmission gear (44) is connected to the sun gear (33) and the brake B1 (47), the output shaft of the fixed displacement motor (22) is connected to the linked intermediate gear set (13) through the third clutch C3 (45) and the fifth clutch C5 (14), and the output shaft of the fixed displacement motor (22) is connected to the sun gear (33) through the third clutch C4 (45) and the sixth clutch C6 (34);
• an output shaft assembly (5), wherein the output shaft assembly (5) comprises an output shaft (51) and an intermediate gear (52), and the output shaft (51) is connected to the planet carrier (32) through the intermediate gear (52).