What is the difference between AT and CVT

[SophiaRose]

AT and CVT differ in the following aspects: 1. Principle: AT works by using a torque converter whose automatic shifting and torque variation range is insufficient, so several rows of planetary gears are connected in series behind the turbine to improve efficiency. The hydraulic control system automatically operates the planetary gears according to the engine's working changes, achieving automatic shifting and torque variation. CVT's transmission pulley structure is quite unique, divided into movable left and right halves that can move closer or apart. The conical discs can tighten or expand under hydraulic thrust, squeezing the steel belt chain to adjust the width of the V-shaped groove. When the conical discs move inward to tighten, the steel belt chain is pushed outward from the center, and vice versa. This changes the diameter of the disc driven by the steel belt chain, altering the transmission ratio. 2. Usage: AT does not require clutch shifting, has fewer gears but significant changes, and connects smoothly, making it easy to operate. It provides convenience for the driver and comfort for passengers. CVT, lacking the transmission gears of a typical automatic transmission, eliminates the shifting process and the associated jerky sensation. Therefore, CVT transmissions deliver linear power output, offering a very smooth driving experience.