CGA says the dual-clutch transmission, developed in conjunction with gearbox maker Getrag, will provide consumers a fuel economy improvement and CO2 emissions reduction of six percent.Chrysler says that dual-clutch transmission technology improves fuel economy and CO2 emissions by reducing parasitic losses—first, by eliminating the torque converter, and second, through the use of synchronizers instead of shift clutches.
In its first Chrysler LLC vehicle applications, the new dual-clutch transmission will debut in international markets on the all-new 2008 Dodge Journey when mated to the turbo diesel variant.
Originally developed by Volkswagen, which calls its DSG, the dual-clutch transmission is an automatic transmission which utilises dual launch and shift clutches with a manual transmission style lay-shaft gear arrangement, instead of a conventional torque converter and planetary gears. During shifts, the next gear is anticipated and pre-selected. Then one clutch is opened while the other is closed, allowing shifting without torque interruption. The result is quicker acceleration and refined shift quality. Further, with the lay-shaft arrangement of gears, there is increased flexibility to optimise gear ratio selection for performance and fuel economy.
The Chrysler/Getrag version of the dual-clutch transmission does not require a torque converter to transfer engine torque to the transmission. Instead, it uses two wet multi-plate clutches. With the wet multi-plate clutch system, the clutch components are bathed in lubricating/cooling fluid in order to provide adequate thermal capacity.
© Source: caradvice
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