Multi-pump driven single-motor hydro-mechanical hybrid transmission device and control method thereof

A multi-pump driven single-motor hydro-mechanical hybrid transmission device, comprising

• an input shaft,
• a planetary gear split mechanism,
• a hydraulic transmission system,
• a planetary gear convergence mechanism, and
• an output shaft;
• wherein
• the input shaft is connected to the hydraulic transmission system and the planetary gear convergence mechanism through the planetary gear split mechanism;
• the hydraulic transmission system and the planetary gear convergence mechanism are both connected to the output shaft;
• the hydraulic transmission system comprises a multi-pump driving mechanism, a fixed displacement motor mechanism, and a hydraulic transmission output mechanism;
• wherein
• the multi-pump driving mechanism is connected to the fixed displacement motor mechanism, the fixed displacement motor mechanism is connected to the planetary gear convergence mechanism, and the fixed displacement motor mechanism is connected to the output shaft through the hydraulic transmission output mechanism;
• the multi-pump driving mechanism comprises two groups of variable displacement pump driving mechanisms, wherein the two groups of variable displacement pump driving mechanisms are connected in parallel and have opposite input directions, and the two groups of variable displacement pump driving mechanisms comprise a first forward input variable displacement pump driving mechanism, a second forward input variable displacement pump driving mechanism, a first reverse input variable displacement pump driving mechanism, and a second reverse input variable displacement pump driving mechanism;
• a reversing valve is arranged between the multi-pump driving mechanism and the fixed displacement motor mechanism;
• the first forward input variable displacement pump driving mechanism comprises a first variable displacement pump, a first check valve, a first pilot-operated relief valve, and a first solenoid valve;
• wherein
• the first solenoid valve controls a control pressure of the first pilot-operated relief valve, and the first variable displacement pump is connected to the reversing valve through the first check valve;
• the second forward input variable displacement pump driving mechanism comprises a second variable displacement pump, a second check valve, a second pilot-operated relief valve, and a second solenoid valve;
• wherein
• the second solenoid valve controls a control pressure of the second pilot-operated relief valve, and the second variable displacement pump is connected to the reversing valve through the second check valve;
• the first reverse input variable displacement pump driving mechanism comprises a third variable displacement pump, a third check valve, a third pilot-operated relief valve, and a third solenoid valve;
• wherein
• the third solenoid valve controls a control pressure of the third pilot-operated relief valve, and the third variable displacement pump is connected to the reversing valve through the third check valve;
• the second reverse input variable displacement pump driving mechanism comprises a fourth variable displacement pump, a fourth check valve, a fourth pilot-operated relief valve, and a fourth solenoid valve;
• wherein
• the fourth solenoid valve controls a control pressure of the fourth pilot-operated relief valve, and the fourth variable displacement pump is connected to the reversing valve through the fourth check valve;
• a jackshaft is arranged between the planetary gear split mechanism and the planetary gear convergence mechanism;
• the planetary gear split mechanism comprises a split mechanism front-sun gear, a split mechanism front-planet carrier, a split mechanism rear-sun gear, a split mechanism rear-planet carrier, and a split mechanism shared ring gear;
• wherein
• the input shaft is connected to the split mechanism front-sun gear and the split mechanism rear-planet carrier;
• a first clutch is arranged between the split mechanism rear-planet carrier and the split mechanism rear-sun gear;
• a second clutch is arranged between the split mechanism front-planet carrier and the jackshaft;
• a third clutch is arranged between the split mechanism rear-sun gear and the jackshaft;
• a fourth clutch is arranged between the split mechanism shared ring gear and the hydraulic transmission system;
• the planetary ear convergence mechanism comprises a convergence mechanism shared sun gear, a convergence mechanism front-planet carrier, a convergence mechanism front-ring gear, a convergence mechanism rear-planet carrier, and a convergence mechanism rear-ring gear;
• wherein
• the jackshaft is connected to the convergence mechanism front-planet carrier, and the convergence mechanism front-planet carrier is connected to the convergence mechanism rear-ring gear;
• a fifth clutch is arranged between the jackshaft and the convergence mechanism shared sun gear;
• a sixth clutch is arranged between the convergence mechanism front-ring gear and the output shaft;
• a seventh clutch is arranged between the convergence mechanism rear-planet carrier and the output shaft;
• an eighth clutch is arranged between the hydraulic transmission output mechanism and the output shaft;
• and
• a brake is arranged between the fixed displacement motor mechanism and the hydraulic transmission output mechanism.