Study on Torque Coordination Control Strategy of Multi-Mode Clutch Transmission

This paper analyzes the power transmission principle of 2DHT, the transmission structure is P1/P3 structure, the engine and P1 motor are rigorously connected. There is a multi-mode clutch between the engine and the transmission, the main structure of the multi-mode clutch is a one-way clutch, and then add a shift motor, you can change the opening state of the one-way clutch, to achieve a variety of modes of the one-way clutch. The engine power is transmitted from the input shaft to the gear. The power and gears are transferred from the driving wheel to the inner ring. The inner ring power is transmitted to the outer ring through the CAM. The outer ring transmits power to the output shaft 1. The function of multi-mode clutch is to realize series parallel switching. When the transmission is in N gear, the vehicle can operate in EV mode and series mode, and the inner ring speed of the multi-mode clutch can be higher than the outer ring speed. When the transmission is in 1st and 2nd gear, the vehicle works in parallel mode, and the inner ring speed of the multi-mode clutch is less than or equal to the outer ring speed, and the multi-mode clutch body is a one-way clutch. Only in the state of one-way clutch, the speed of the inner ring and the speed of the outer ring are equal, and the acceleration of the inner ring is higher than or equal to the outer ring, in order to run in parallel. In order to improve the acceleration performance of the vehicle, a set of torque coordination strategy is developed. When the vehicle accelerates from a standstill, it first uses the EV mode of pure electricity. When the speed increases to the point where you are ready to travel in parallel, first move the paddles to the far left. When the speed has reached close to the parallel speed, in order to reduce the impact, the P1 motor starts to speed. When the speed of the inner ring is close to the speed of the outer ring, it begins to enter the parallel mode of the first gear. As the speed continues to increase, when the current gear is no longer suitable, in order to remove the low gear, continue to start the speed regulation through the P1 motor. When the inner ring speed is lower than the outer ring speed in 1 gear, move the paddle to the middle position. Continue to start speed regulation through P1 motor. When the inner ring speed is lower than the outer ring speed in 2nd gear, move the paddle to the right position. This is a 2-speed parallel mode. Thus, the continuous power output of the new structure is realized. Then the closed-loop control verification platform of the whole vehicle is established by Simulink, and the operation is simulated by using actual parameters. The information obtained from the curve shows that the proposed torque coordination strategy can realize the continuous power output of this new structure, which is obviously helpful to improve the speed.