Research On Performance Simulation Of The Split Variable Diameter Belt CVT

CVT, as the main part of the vehicle powertrain, has always been the people's the ultimate goal. CVT control system plays an important role in vehicle performance, CVT control system is complex and expensive at present, so the paper advanced a low-cost mechanical control method for split variable diameter belt CVT and studied it's performance by related software.Introduced the operational principle on the split variable diameter belt CVT, analyzed and calculated its main parameters. In Matlab / Simulink environment, established the CVT control system model, engine model and vehicle model. PID control strategy was used to control motor torque, in order to control lever actuator to change the radius of driving and driven pulley, then achieve precise control of transmission ratio. When simulated the CVT control system, analyzed the effects to control system for different structure parameters, then validated and amended necessarily the parameters.By discussion of the engine model, split variable diameter belt CVT model, a simplified motor model and vehicle longitudinal dynamics model, established the vehicle of Matlab / Simulink simulation model.When vehicle model driving at different conditions, the economy and dynamic simulation analysis, studied shift schedule and control strategies, summed up the speed, fuel consumption and other changes rules, and evaluated the effects of the split variable diameter belt CVT on the vehicle dynamic and economy performance. In this paper, achieved the desired objectives for split variable diameter belt CVT and laid the foundation for further study.