The principle of the the continuously variable transmission automotive is simply introduced analyzed and the characteristics of the metal belt CVT is analyzed.The major efficiency loss source of the CVT is analyzed
it was proposed the most potential part to improve the efficiency is the CVT shifting mechanism and its control strategy.Through analyzing a new control method which as a slip rate between the strip and the pulley to a control parameter can be effectively improve the efficiency
a formula of clamping force based on the slip rate deduced
it provides a theoretical basis for further improve the efficiency of transmission gear.