Investigation on adaptive method of torque characteristic in dual clutch transmission during launch phase

Abstract

To reduce sliding friction work and clutch judder, an adaptive method of torque characteristic in dual clutch transmission during launch phase is presented in this paper. The proposed approach provides a tool to identify the change of torque characteristic and adapt it in real time. Firstly, to reduce the influence of the error between the nominal engine torque and the actual engine torque, the estimator based on the extended Kalman filter is designed to estimate the transmitted torque of the dual-clutch transmission during launch phase. Furthermore, the torque characteristic adaptive method is presented by a combination of the estimator with the improved Least Square Method. Then, based on the established driveline model of the dual-clutch transmission, the torque characteristic adaptive method during launch phase is validated by MATLAB/Simulink. Finally, in order to further evaluate the application potential of the adaptive method, the experiments are conducted on a production vehicle equipped with the wet dual-clutch transmission. The simulation and experiment results show that the proposed algorithms work well.

Multi-body dynamics in vehicle engineering

“…Applications of MBD in stick-slip motion have included the study of untoward noise, vibration and harshness (NVH) phenomena such as judder of dry clutches. [121][122][123][124][125][126][127][128][129][130][131][132] Clutch judder occurs as the result of stick-slip motion at the clutch friction lining interface, mostly during vehicle take-off (launch). It is the lowest natural frequency (rigidbody torsional-dynamics mode) of the clutch system which is usually in the range: 7 to 10 Hz.…”

Offline model predictive control approach to micro-slip control in gearshifts of dual clutch transmission

“…Therefore the sudden variations can be avoided in transmitted torque resulting in a number noise vibration and harshness (NVH) issues which occurs in single clutch, especially in-cycle clutch vibration known as whoop 1 and slip which invariably leads to the phenomenon called clutch judder. [2][3][4][5][6] So, the main aim of DCT is to avoid the torque fluctuations which cause such phenomena with single clutch.…”