DCT is a new kind of automatic transmission with dual clutch

which realizes power shift

and the process of shifting is smooth and rapid.How to determine the scope of transmission ratio and the number of speed gears

how to distribute the gear ratio with geometric progression and partial geometric progression are expound.The initial selection and distribution of gear ratio was completed rapidly by VB software.DCT vehicle model is created based on vehicle parameter and engine characteristic for simulation of dynamic properties and ENDC fuel economy by the software Cruise to evaluate and optimize the performance of gear ratio.