Dynamics and control of gearshifts on twin-clutch transmissions

Abstract

Based on a detailed dynamic model of an automotive powertrain containing a twin-clutch transmission, an integrated powertrain control for gearshifts is developed. The operation of this controller is demonstrated on the basis of simulation results for upshifts, downshifts, and multiple gearshifts taking place within the same half of the transmission. The control algorithm makes use of closed-loop control of clutch slip for a smooth transfer of engine torque with the aim of reproducing the operation of a one-way clutch. Further elements are a closed-loop control of engine speed through a combination of a manipulation of engine controls and clutch pressure. In addition, it is demonstrated that the control of transmission output torque during gearshifts can add robustness to the control and provides a means to manipulate directly the gearshift character. Finally, the dynamic effects of gear preselection through conventional hydraulically actuated cone-type synchronizers on the overall shift quality are discussed.

Optimization of Wet Multi-disk Clutch Based on Improved Genetic Algorithm

“…As shown in formula (12), the c is in the range of [1,1]. If c=-1, it indicates that the fitness value is the worst when two parameters are taken this combination, during the next generation is produced, the probability that individual again produce this combination is almost zero; If c=0, it indicates that the values of two parameters are without interference, when one parameter is taken this combination corresponding value, the other parameter is random taken another value; If c=1, it indicates that the influence between the two parameters value is large, and the probability that this combination appeared in the next generation is large.…”

“…In the process of vehicle starting and shifting, wet multidisk clutch plays a key role, the optimization design of the clutch can prolong the service life of the clutch and reduce processing costs [1][2][3].…”

Two-Speed DCT Electric Powertrain Shifting Control and Rig Testing

“…A similar model is adopted by [4]; however the postlockup torque is not well defined. In Goetz et al [7,10] a transfer function model of the hydraulic system is utilized over a detailed model, citing issues with the discontinuous contact in the clutch as a limiting factor. In this paper a nonlinear spring contact model is used to overcome this issue; thus a fourth variable of Advances in Mechanical Engineering piston displacement is introduced to the piecewise model of the clutch, where the return spring separates the plate contact and the clutch torque drops to zero, excluding a small viscous contact component.…”

Control-Oriented Models for Real-Time Simulation of Automotive Transmission Systems

“…Automated Manual Transmissions (AMT) with dry clutches are the most efficient systems, but they do not meet customer expectations due to torque interruption during gear shift (Zhang et al, 2005). If compared to other transmissions, the DCT technology has the advantage of being suitable both for low revving and high torque Diesel engines, and for high revving engines for sport cars, maintaining a high transmission efficiency, as well as high gear shift performance and comfort (Matthes, 2005;Goetz et al, 2005). A Dual Clutch Transmission can be considered as an evolution of the AMT.…”