30-04-2021

Bmw Automatic Gearbox



Conventional cars nowadays will come with either a manual or automatic gearbox but there is a variation of the latter known as the semi-automatic gearbox.

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Finding a car which has a gearbox that only works in a semi-automatic manner is very rare nowadays, thanks to the rise of dual-clutch systems. But many of the new cars on the market nowadays which offer a dual clutch/automatic gearbox can be operated by the driver in a semi-automatic fashion if they choose.

Semi-automatic gear changes explained

A gearbox that works semi-automatically (also known as automated manual) requires the driver to make gear changes themselves, like with a manual gearbox. The key difference is that while a manual ‘box requires the use of a clutch pedal, a semi-automatic removes this part from the driver’s reach and completes its function electronically.

Since electronic equipment takes care of the clutch, the gearbox can time its gear changes to the torque of the engine and make each gear change fast, precise and smooth.

However, some gearboxes that change gears electronically can struggle completing this function as quickly and as smoothly as drivers would want when the car makes a sudden change of speed following, say, heavy braking. Because of this, a semi-automatic function can prove more appealing to drivers.

With no clutch pedal or large gearstick necessary, someone who drives a car semi-automatically will use either a small gear lever with simple up or downshift changes or use paddles mounted on the outside edges of the steering wheel. A gearbox that can be used semi-automatically and includes these paddles is known to some by the informal term ‘flappy-paddle gearbox’.

While there is less effort and engagement involved than with a manual gearbox, driving a car semi-automatically still gives the driver the pleasure of pushing the car through the gear ratios using a gear-selecting-lever.

Popular examples of gearboxes in current new cars which offer automatic and semi-automatic functionality include the Volkswagen Group’s DSG, Ford PowerShift and BMW DCT.

Bmw automatic gearbox

Activating the sport program


Activating the sport program

Push the selector lever to the left out of transmission position D.

The Sport program is activated and DS is displayed in the instrument cluster; in the BMW X6, S4 is displayed, for example.

Bmw Auto Gear Stick

This position is recommended for a performance- oriented driving style.

Activating the M/S manual mode

Push the selector lever to the left out of transmission position D.

Push the selector lever forward or backward.

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Manual mode becomes active and the gear is changed.

The engaged gear is displayed in the instrument cluster, e.g., M1.

▷ To shift down: press the selector lever forward.
▷ To shift up: press the selector lever backward.

The transmission only shifts up or down if the rpm and vehicle speed are appropriate. If the engine speed is too high, the transmission does not shift down.

Bmw Automatic Gearbox Specialist

The selected gear is briefly displayed in the instrument panel, followed by the current gear.

Ending the sport program/manual mode

Push the selector lever to the right.

D is displayed in the instrument cluster.

BMW X6: Gear change using the shift paddles on the steering wheel

The shifting paddles make it possible to quickly change gears since both hands can remain on the steering wheel.

▷ If the shift paddles on the steering wheel are used to shift gears while in automatic mode D, the transmission temporarily switches to manual mode.
▷ If the shift paddles are not used to accelerate or shift gears for a certain amount of time, the transmission switches back to automatic mode D.

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With the transmission position M/S selected, the manual mode remains active.


BMW X6: Gear change using the shift paddles on the steering wheel

▷ Shift up: pull right shift paddle.
▷ Shift down: pull left shift paddle.

The vehicle only shifts up or down at appropriate engine and road speeds, e.g., it does not shift down if the engine speed is too high.

Gearbox

The selected gear is briefly displayed in the instrument cluster, followed by the current gear.

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