The Next Generation of Efficient Dry Double Clutch-Systems

摘要

The dry double clutch system has been successfully established in the market for several years. The system is particularly used in high volume in the compact and lower mid-size class of cars, an indication for the excellent cost effectiveness of this technology. A significant advantage in CO_2-reduction due to high system efficiency has been confirmed through extensive testing. The market will demand further optimization for fuel consumption in the future, which in dry double clutch systems means weight and envelope reduction and compatibility with hybrid solutions. Hybridization offers new opportunities in system design for the dry double clutch, for example through the reduction of friction energy in the clutch which can be directly converted into weight reduction. Vibration damping requirements will also increase since vehicles will more and more use smaller, boosted three and four cylinder engines, as well as reduced friction drive trains. In order to increase the vibration damping and/or reduce the disturbance excitation in dry double clutch systems, besides optimizing components, new design solutions were developed such as the directly actuated dry double clutch with hydrostatic clutch actuation system and software-anti-judder damping. Hybrid drive trains offer additional options, by increasing drive train damping passively and actively through the electric motor.