A quick overview on Automatics.
Planetary gear systems- remember the zen auto, or even humble 800 auto??
More recentely, the santro auto? All had planetary gear trains. 3 gears.
PRNDL.[ Parking,Reverse,Neutral,Drive,Low]. Used Energy sappping torque converters.Low mileage.
Robotised Manuals- Neccesarily manual transmissions, robotised using hydraulics and computer controls. Fast, less energy sapping, but bulky. Sonata H matic, Recentely The scorpio.
Cvt- Almost like the variators used in scoterrets, sunny, activa and the lyks.
Came later in cars, due to engineering constraints. It Primarily uses a belt sliding on cone shaped pulleys. The torque rating of cars being higher, the belt construction was dificult.Proggamble for paddle shifting. Used in city,Civic.
Sequential Gearboxes- Next generation robotised manuals.Very quick. Audi A4, A6, Bmw 3 series, 5 series.
DSG- Dual clucth sequentials. Lightning fast. Twin Clutch. 100 Milisecond gear changes. Ferrari california, A8 W12.
Still Somebody in the notion of automatics being slow, bulky energy sapping systems??