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Optimal control of the gear shifting process for shift smoothness in dual-clutch transmissions

机译：双离合变速箱换挡过程的最佳变速控制

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摘要

The control of the transmission system in vehicles is significant for the driving comfort. In order to design a controller for smooth shifting and comfortable driving, a dynamic model of a dual-clutch transmission is presented in this paper. A finite-time linear quadratic regulator is proposed for the optimal control of the two friction clutches in the torque phase for the upshift process. An integral linear quadratic regulator is introduced to regulate the relative speed difference between the engine and the slipping clutch under the optimization of the input torque during the inertia phase. The control objective focuses on smoothing the upshift process so as to improve the driving comfort. Considering the available sensors in vehicles for feedback control, an observer design is presented to track the immeasurable variables. Simulation results show that the jerk can be reduced both in the torque phase and inertia phase, indicating good shift performance. Furthermore, compared with conventional controllers for the upshift process, the proposed control method can reduce shift jerk and improve shift quality.
机译：车辆传动系统的控制对于驾驶舒适性至关重要。为了设计一种平稳换挡和舒适驾驶的控制器，本文提出了一种双离合器变速器的动力学模型。提出了一种有限时间线性二次调节器，用于在升档过程的扭矩阶段对两个摩擦离合器进行最佳控制。引入了一个集成的线性二次调节器，以在惯性阶段优化输入扭矩的情况下调节发动机和滑动离合器之间的相对速度差。控制目标集中于平滑升档过程，以提高驾驶舒适性。考虑到车辆中可用于反馈控制的传感器，提出了一种观察器设计来跟踪不可估量的变量。仿真结果表明，在转矩阶段和惯性阶段都可以减小冲击，表明良好的换档性能。此外，与用于升档过程的传统控制器相比，所提出的控制方法可以减少换档冲击并提高换档质量。

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