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Video Autom. Transmission
Video Power Flow
Video Add. Information
Video 6-gears Automatic
Video 7-gears Automatic
Video 8-gears Automatic
Video Four-wheel Drive)
Video Autom. Transm. (bus)
Video Autom. Transm. (repair)
Video Planetary Gearbox
Video Comb. Planetary Set
Video Multi-disc Clutch

Video Free-wheel
Video Transmission Box
Video Fuzzy Logic
Video Semi Autom. Transm.
Video Cont. Var. Transm.
Video Chain CVT-gearbox
Video Tractor
Video Combine Harvester
Video CVT for Tractor
Video Var. Transmission
Video Seq. Gearbox 1
Video Seq. Gearbox 2
Video Seq. Gearbox 3
Video Seq. Gearbox 4
Video D.-clutch Gearbox 1
Video D.-clutch Gearbox 2
Video Transmission control

Video Transmission ratio
Video Planetary gearbox
Video Hydraulic ratio
Video Two shafts gearbox

Video Automatic transmission 1


          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Sequential Gearbox







Sequence is not directly related to automatic

An automated transmission is also known as a sequential gearbox. A sequence means roughly, 'order' or 'cycle' and indicates here, the exact succession of the gear-speeds, primarily when up-shifting, in contrast to the complete freedom of choice with the manual gearbox. An advantage is, among other things, the elimination of the torque-converter with its unfavourable efficiency.The sequential gearbox actually, has already been around for a long time. E.g., most motorcycle and moped gearboxes fit this description. Their gears are selected by a gear shift pedal, and except for the first gear, one after the other, changed up and also, one after the other, down again, this is not always the case with an automatically changing gearbox.

Effectively like a manual gearbox, operation like an automatic

The operation can be the same as with the fully-automatic gearbox. Here a operating error is practically impossible. However, the sequential gearbox originates from the manual gearbox with clutch. Its activity is taken over by an electric motor or by central hydraulics (see figure above). The control module processes the driving speed, position of the accelerator pedal and selector lever and possibly also additional parameters concerning the gear selection. When operating the clutch the RPM has an additional meaning. The signals available in the engine control module can also be received through a CAN-Bus. It would thus be possible to also analyse the engine temperature, e.g., to lower the gear changing points when the engine is cold.

Using a clutch, slow gear changing, fuel saving

The changing operations of present sequential gearboxes are a little too slow, as a rule, for sporty driving. This can be remedied by the twin-clutch gearbox. Moreover, a skilled driver can control the reversing of a vehicle with a customary, foot-operated clutch a little better. Not only do learner drivers seem to have difficulties with letting in the clutch, but also the electronics do as well.Nevertheless, the controlling device operates, e.g., in the determination of the gear-changing points, more rationally than most drivers. Thus, the guaranteed lowest consumption is available with certain vehicles from the manufacturer's selection, only in the ECO mode of the sequential gearbox. 10/08








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Translator: Don Leslie - Email: lesdon@t-online.de

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