Performance Analysis and Parameters Optimization of a Novel CVT with User Trust-Preference Fusion

For a novel continuously variable transmissions (CVTs) mechanism, evaluation system of the transmission performance is put forward, whose indicators are the split-torque ratio of input torque, the split-power ratio of input power, the ratio of output torque to input torque and the variable width of speed ratio. The variation trends of the transmission ratio of the fixed-axis gear train and the shifting mechanism of the double-row differential gear train, which helped to adjust the performance indicators towards the expectation objectives, were analyzed. The mathematical models characterizing the smaller split-torque ratio of input torque, the bigger ratio of output torque to input torque and the bigger variable width of speed ratio were developed, with these two transmission ratios considered as design variables. A non-inferior solution of the multi-objective optimization model was produced, by using the linear weighted method and Fmincon function. The curves on the split-torque ratio of input torque, the ratio of output torque to input torque were drawn under the non-inferior of these two transmission ratios. The corresponding variable widths of speed ratio were calculated. The result shows that the novel CVTs mechanism has the features of high output torque and large output speed range.