Powershift DCT is different from the general DualClutchTransmission)DCT system.
It is based on manual transmission instead of automatic transmission, which can provide uninterrupted power output besides the flexibility of manual transmission and the comfort of automatic transmission. However, the traditional manual transmission uses a clutch. When shifting gears, the driver must step on the clutch pedal to make the gears of different gears mesh, and the power is interrupted when shifting gears, which makes the output performance intermittent.
The core technology of DCT is only in the hands of Borgwarner in the United States and Schaeffler in Germany. Borgwarner is the key technology provider of Volkswagen's first generation of six-speed DSG (Volkswagen DCT), providing wet dual clutch for Volkswagen DSG. This spring, Volkswagen released a new generation of dry seven-speed powershift, which was provided by LuK Company, a subsidiary of Schaeffler Group in Germany.
principle
DCT includes two automatic clutches, which are driven by electric control and hydraulic pressure, and can control the work of both clutches at the same time. When the transmission is running, one set of gears is in the engaged state, and when it is close to shifting, the gear of the next set of gears has been pre-selected, but the clutch is still in the disengaged state; When shifting gears, one clutch is disengaged from the gear in use, and the engagement of the other clutch is pre-selected, so that at least one gear can output power during the whole shifting period without power interruption. In order to cooperate with the above operations, the transmission shaft of DCT is divided into two parts, one is a solid transmission shaft and the other is a hollow transmission shaft. The solid drive shaft is connected to 1, 3, 5 and reverse gear, and the hollow drive shaft is connected to gear 2, 4 and 6. The two clutches are respectively responsible for the meshing action of a transmission shaft, and the engine power will be continuously transmitted by a transmission shaft.
Compared with the traditional manual transmission, DSG is more convenient to use, because it is still an automatic transmission in the final analysis, but it adopts the new technology of DCT, which makes the manual transmission have automatic performance and greatly improves the fuel economy of the automobile. DCT is faster and smoother than manual shift in gear shifting and uninterrupted power output. Based on the characteristics and working mode of DCT, DCT system can bring drivers the same feeling as driving a racing car. In addition, the torque interruption during manual gear shifting is eliminated, and driving is more sensitive. Based on its use of manual transmission and its unique design, DCT can resist up to 350 N? Torque of the instrument,
technical background
1940, RudolphFranke, a professor at darmstadt University, was the first to apply for a patent in powershift. The transmission was tested on a truck, but it was not put into mass production. Subsequently, Porsche also invented powershift specially for racing cars. However, in that era, DCT/PDK technology was not successfully put into mass production.
1985, Audi applied the dual clutch technology to the track and was named? AudiSportQuattroS 1 racing car with dual clutch technology? . Dual-clutch technology enabled Audi cars to gallop in the major off-road fields at that time and win many competitions.
By the end of 1990s, Volkswagen and Borg Warner cooperated to produce the first DualTronic(R) technology powershift suitable for mass production and mainstream vehicles.
Borgwarner turned DCT into a practical transmission by using new electro-hydraulic components. In 2002, DCT was applied to German Volkswagen Golf R32 and Audi TTV6. In 2003, it was extended to golf and other vehicles.
In 2004, DCT first matched TDI diesel engine on Volkswagen Touran, Germany.
DCT has become one of the most important products in Europe because of its excellent fuel economy. New favorite? . The new DCT project of Borgwarner is scheduled to be put into production this year (2007), mainly producing luxury passenger cars and sports cars, with an annual production capacity of 600,000 units.
classify
Wet power shift and dry power shift.
technology application
On June 5438+065438+1October, 2007, when Borg Warner fully implemented the announced plan, it is expected to provide its innovative DualTronic(R) technology to 2.3 million powershift every year. This remarkable growth was driven by powershift Technology, the company's first listing, which won business from transmission and vehicle manufacturers all over the world, including projects with Volkswagen, Audi, Bugatti, Shanghai Automotive Industry Corporation and Nissan, as well as projects with Gertrak and five global automakers.
Different transmissions of different companies based on DCT technology
Volkswagen DSG (direct shift gearbox)
Odie strangnik
BMW MDKG (dual clutch gearbox)
Ford and Volvo Power Shift
Porsche PDK (Porsche Dual Clutch Transmission)
Mitsubishi TwinClutchSST
Million car purchase subsidy