Instead of using one or
more planetary gear sets like a traditional transmission, a CVT uses pulleys and steel belts to provide an infinite number of «gear ratios».
Not exact matches
DCTs are
more efficient because their helical
gears (in place of a conventional automatic's
planetary gears) create lower hydraulic and friction losses.
Using
planetary gears gives the Antonov design the advantage of a higher engine torque limit (
more gear teeth bearing load), at the expense of greater complexity.
Additional components that help make the Prius
more efficient include an active grille shutter, an exhaust heat recirculation system, and a replacement of the previous
planetary gear arrangement with parallel
gears to help prevent mechanical losses.
It continuously adjusts
gear ratios through a
planetary gearset that
more precisely matches engine output with acceleration and fuel economy.