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.
In this paper a dynamic model of a twin clutch transmission is developed based on a multi-body system representation. A thorough description of the friction model of clutch and synchronisers is given. Special emphasis is laid on a detailed modelling of the hydraulic clutch actuation and the implications this yields for the design of a gearshift controller. Simulation results of a closed-loop gearshift controller are presented and the influence of the friction coefficient on the gearshift is studied.
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