车辆工程, 无级变速传动;传动比;夹紧力;耦合

Utilizing the coupling effect between clamping force and speed ratio, the shift speed is improved by conditioning the pressure of both primary and second pulleys' hydraulic cylinders. System pressure safety must be ensured to satisfy the clamping force which could meet the requirements of torque transmission. As a result, real ratio tracked the target more rapidly and shift speed range was enlarged. An active coupling control strategy was studied, which included shift speed, clamping force related transmission reliability, fuel economic, dynamic performance, hard condition adaptability, and shift speed related comfortableness. Simulation results show that by adopting active coupling control strategy, reliability, economic, and comfortableness are ensured while ratio tracking performance and power performance are improved. Particularly, ratio tracking error is reduced by 11%~53%, 30~60km/h overtaking acceleration time is shortened by 0.7s.