Study on the Slip Rate of CVT in Un-steady States

Aiming at the slip rate of CVT, the relationship between the actual optimal slip rate and the theoretical optimal slip rate is analyzed. The recognition method of vehicle driving cycle is established, the correction coefficient of slip rate in different driving condition can be determined and then the slip rate will be controlled to the theoretical optimal value. Based on the simulation model of the vehicle with CVT and analysis result of Co-simulation of Simulink and AMESim, the clamping force control method in un-steady drive states is proposed and a comparison with the traditional clamping force control method is made. And then Experimental results show that these method increases slip rate stability, improves the efficiency of the CVT, and verifies the feasibility of the clamping force control method.