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In this paper a gearshift controller for twin clutch transmissions is developed. The controller incorporates the control of engine variables to achieve synchronization whilst the transfer of engine torque from clutch to clutch is managed by a clutch slip control. On top of this gearshift controller and as an extension to the basic control scheme a transmission output torque control is included as a means to directly influence shift character and add robustness to the control. The transmission output torque control also provides the foundation for an integrated torque management scheme of powertrain components. Simulation results for upshift and downshift are presented and discussed in the final chapter of this paper.

Torsional motion of a truck driveline system is coupled with other motions of its components. In this paper, a comprehensive model of the truck driveline and body for vibration analysis was developed. Coupling of the torsional vibration of the truck driveline system with the body fore-aft and vertical vibrations was investigated. A mathematical model, including the torsional vibration of the driveline system and the whole body vibrations of the truck, was constructed. The driveline system was modelled as a set of inertia discs linked together by massless springs and the tyre was represented as having massless circumferential band which is elastically connected to the carcass with the bands being subject to longitudinal forces at the road surface. System behaviour at steady and transient runs was developed.

This research paper is focused on a novel transmission which provides a continuously variable gearbox based on two epicyclic gear sets plus two electric motor/generator units. This design scheme offers potential efficiency benefits over its competitors. It is referred to as a four branch transmission [1], because it has four independent power input and output, namely the engine, two motor/generators and the output shaft of the transmission. A key advantage of the design, when it is used on a hybrid electric vehicle, is that the electrical machines, namely the two motor/generators, and can be downsized compared with the more common, single epicyclic, 3 branch arrangement. A matrix method for the analysis of planetary transmissions [2] is used; the performance and control strategy of the new system is presented.