What is an Automatic Transmission?

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Automatic Transmission:

Most modern cars have an automatic transmission that selects an appropriate gear ratio with none operator intervention. They primarily use hydraulics to pick gears, betting on the pressure exerted by fluid within the transmission assembly. instead of employing a clutch to interact with the transmission, a fluid flywheel, or convertor is placed in between the engine and transmission. The motive force can control the number of gears in use or select reverse, though precise control of which gear is in use may or might not be possible.

Automatic transmissions are easy to use. However, within the past, some automatic transmissions of this kind have had several problems; they were complex and expensive, sometimes had reliability problems (which sometimes caused more expenses in repair), have often been less fuel-efficient than their manual counterparts (due to “slippage” within the torque converter), and their shift time was slower than a manual making them uncompetitive for racing. With the advancement of recent automatic transmissions, this has changed.

 

Better Fuel Consumtion:

Attempts to boost the fuel efficiency of automatic transmissions include the employment of torque converters that lock up beyond a particular speed or in higher gear ratios, eliminating power loss, and overdrive gears that automatically actuate above certain speeds. In older transmissions, both technologies can be intrusive, when conditions are specified they repeatedly cut in and out as speed and such load factors as grade or wind vary slightly. Current computerized transmissions possess complex programming that both maximizes fuel efficiency and eliminates intrusiveness. This can be due mainly to electronic instead of mechanical advances, though improvements in CVT technology and therefore the use of automatic clutches have also helped. A few cars, including the 2013 Subaru Impreza and also the 2012 model of the Honda Jazz, actually claim marginally better fuel consumption for the CVT version than the manual version.

For certain applications, the slippage inherent in automatic transmissions may be advantageous. As an example, in drag racing, the automated transmission allows the car to prevent the engine at a high rpm (the “stall speed”) to permit an awfully quick launch when the brakes are released. A standard modification is to extend the stall speed of the transmission. This is often even more advantageous for turbocharged engines, where the turbocharger must be kept spinning at high rpm by an oversized flow of exhaust to take care of the boost pressure and eliminate the turbo lag that happens when the throttle suddenly opens on an idling engine.

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