A CVT has a pair of pulleys with variable ratios, and a big belt between them, to allow the belt to shift between ratios and find the best ratio. CVT has some

A CVT has a pair of pulleys with variable ratios, and a big belt between them, to allow the belt to shift between ratios and find the best ratio. CVT has some inefficiencies that can be improved by putting the gear selection process from an automatic onto a manual (with an automated sequential manual gearbox or a "double-clutch" transmission). https://www.fueleconomy.gov/feg/tech_transmission.shtml https://www.fueleconomy.gov/feg/tech_transmission.shtml http://www.nrel.gov/docs/fy11osti/47806.pdf http://www.nrel.gov/docs/fy11osti/47806.pdf