Dynamic Behaviour of an Automotive Dual Clutch Transmission during Gear Shift Maneuvers

The paper presents a model for the torsional dynamics of an automotive driveline equipped with Dual Clutch Transmission (DCT), focusing on gear rattle phenomenon arising during transients engagement and disengagement clutches, synchronizing manoeuvres. This vibro-acoustic phenomenon, particularly annoying in transmissions, can be accentuated by presence many unloaded gears this type gearbox. systems are today largely diffused car automatic permitting fast shifts avoiding interruption drive torque. study is conducted adopting tribo-dynamic lumped parameters, considering oil lubricant between teeth acting as damper impacts. A layout gearbox six speed ratios has been assumed, which dual clutch system transmits torque alternatively various pairs odd even branches. results numerical simulations show that kind transmission characterised hard rattling behaviour, rapid phases clutches engaging/disengaging synchronisation. Some solutions to attenuate vibrations, therefore behaviour DCT gearbox, analysed proposed determine, example, time duration shift phase or pre-selection next gear, well identify optimal lubrication conditions transients.