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With some automatic transmissions, it was possible to place the shift selector at any point, either in an intended gear or between a gear. Because of the possible safety issue of this, and because driving a vehicle not fully in a gear over a long period of time could damage the transmission, automakers developed what is called the "detent system."
As the vehicle slowed down and engine speed decreased, the gearbox would shift back to low. However, the transmission was prone to sudden failure, due to the transmission being unable to withstand forces from the abrupt gear changes. The adoption of planetary gearsets was a significant advance towards the modern automatic transmission.
The parking pawl locks the transmission's output shaft to the transmission casing by engaging a pawl (a pin) that engages in a notched wheel on the shaft, stopping it (and thus the driven wheels) from rotating. The main components of a parking pawl mechanism are the parking gear, parking pawl, actuator rod, cam collar, cam plate, pivot pin, and ...
The most common design of automatic transmissions is the hydraulic automatic, which typically uses planetary gearsets that are operated using hydraulics. [ 11 ] [ 12 ] The transmission is connected to the engine via a torque converter (or a fluid coupling prior to the 1960s), instead of the friction clutch used by most manual transmissions and ...
With modern drive by wire fuel controls, problems are believed to occur exclusively while the vehicle is under way. General Motors cars of the 1950s with automatic transmissions have the R for reverse at the furthest clockwise position in the rotation of the column-mounted shift lever. L for low position is just adjacent as the lever moves one ...
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Idle creep, sometimes called idle speed or just creep [citation needed] is the default speed that a vehicle with an automatic transmission will move either forward or in reverse when the change lever is in D for drive or R for reverse and the foot is taken off the brake pedal but the accelerator pedal is not depressed.
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