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A direct-shift gearbox (DSG, German: Direktschaltgetriebe [1]) [2] [3] is an electronically controlled, dual-clutch, [2] multiple-shaft, automatic gearbox, in either a transaxle or traditional transmission layout (depending on engine/drive configuration), with automated clutch operation, and with fully-automatic [2] or semi-manual gear selection.
With a manual transmission, upshift time can be reduced by installing a lighter flywheel. During an upshift, the engine speed must decrease to synchronize with a higher gear; a lighter flywheel will allow the engine speed to drop more quickly, leading to shorter shift times.
In Japan, 91,000 vehicles were recalled in 2013, specifically those with the dry 7-speed DSG (DQ200). [ 59 ] [ 60 ] Same year the Volkswagen Group recalled 1.6 million vehicles worldwide with the dry-running 7-speed dual-clutch transmission, type DQ200, including 257,000 in Germany.
Gear shift lever on a motorcycle (above the toe of the rider's boot) A sequential manual transmission is unsynchronized, and allows the driver to select either the next gear (e.g. shifting from first gear to second gear) or the previous gear (e.g., shifting from third gear to second gear), operated either via electronic paddle-shifters mounted behind the steering wheel or with a sequential ...
The Lamborghini Aventador uses a single-clutch lightweight 7-speed automated manual gearbox built by Graziano. [ 7 ] [ 8 ] Despite being single-clutch, gear-shifts are accomplished in 50ms. The Gallardo and the first-generation Audi R8 used a mid-engine Graziano gearbox ( manual or automated manual versions).
Almost all quickshifters for upshifts on motorcycles work on the same basis: a microcontroller detects the gear shift action via a sensor, calculates the shift timing, and momentarily cuts off the ignition, resulting in a reduction of the load at the transmission allowing the engine speed to match the transmission speed of the next gear and permit the gear to slip (and engage) into place.
The Ford–GM 10-speed automatic transmission is part of a joint venture between Ford Motor Company and General Motors to design and engineer two transmissions: a longitudinal 10-speed transmission and a transverse 9-speed trans-axle. Each company manufactures its own unique version of the transmissions in its own factories.
Beginning in the early 1980s, many United States-market vehicles equipped with a manual transmission began to have shift lights as standard equipment; these would usually signal for an upshift at an engine speed that provided maximum fuel efficiency, lower than the ideal engine speed for maximum power.