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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."
Ways of resolving sudden unintended acceleration is to apply the brakes and/or clutch, or shift into neutral if the car has an automatic transmission. [ 72 ] [ 73 ] [ 3 ] In most cars, fully applied brakes are easily capable of stopping the car while the accelerator pedal is also fully applied. [ 17 ] "
This creates a compound issue in which the shifter linkage or cable can break due to excess force. The vehicle's owner guide states the appropriate procedure is to engage the parking brake before shifting to Park, rather than relying on the pawl, as the pawl is a last line of defense to prevent the vehicle from moving unintentionally.
The modern automatic transmission is now able to achieve better fuel economy, reduced engine emissions, greater shift system reliability, improved shift feel, improved shift speed and improved vehicle handling. The immense range of programmability offered by a TCU allows the modern automatic transmission to be used with appropriate transmission ...
This was followed in 1937 by the Oldsmobile Automatic Safety Transmission. Similar in operation to the REO Self-Shifter, the Automatic Safety Transmission shifted automatically between the two gear ratios available in the "Low" and "High" ranges and the clutch pedal was required for standing starts. It used a planetary gearset.
When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [40-45 mph or more] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. Overdrive should usually be selected when the average speed is above 70 km/h (40-45 mph).
Pushing a button on the shift control preselected the chosen gear. The electrical circuit was closed only after the driver fully depressed the clutch pedal. This energized the appropriate transmission mounted solenoids necessary for returning the transmission to neutral and then completing engagement of the preselected gear.
A park by wire system engages the parking pawl of a transmission using electrical means, without the traditional mechanical system which involves linkages between the gear shifter and the transmission. Park-by-wire can be considered a part of a shift by wire system, as it shifts the transmission into park mode. [1]
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