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对采用双离合切换式换挡材DCT车辆而言,两个离合器的分离接合对换挡品质有重要的影响.为了实现DCT快速平顺的换挡过程控制,文章提出将换挡过程中的力矩相和惯性相作为一个整体进行优化控制,同时考虑换挡过程中发动机节气门配合的控制策略.考虑到传动系统的高度非线性和不确定性,采用数据驱动预测控制方法进行控制器设计.在进行控制器的设计时,首先针对离合器的动作设计了充分激励信号,然后根据该激励数据及在该激励数据作用下系统的输出响应利用子空间辨识的方法构造了Hankel矩阵,进而利用最小二乘法求解出被控对象的数据预测方程,依据换挡品质评价指标选取反映换挡快速性与平顺性的车辆冲击度和离合器转速差作为目标函数,考虑到换挡执行机构的响应能力的约束,进而将换挡过程闭环控制问题转化为反复开环求解使目标函数值最小的控制输入的优化问题,最后进行了离线仿真实验,验证了控制器的合理性和有效性.
In the case of DCT vehicles with double-clutch shifting gears, the disengagement of the two clutches has an important influence on the gear shifting quality.In order to achieve a fast and smooth DCT shift process control, the paper proposes that the torque phase And inertia phase as a whole, taking into account the control strategy of the engine throttle valve in the shift process.Due to the high nonlinearity and uncertainty of the transmission system, the data driven predictive control method is used to design the controller In the design of the controller, a sufficient excitation signal is designed for the clutch operation. Based on the excitation data and the output response of the system under the excitation data, a Hankel matrix is constructed by subspace identification, and then the least square method is used to solve the controller According to the shift quality evaluation index, the vehicle impact degree and the clutch speed difference which reflect the fastness and ride comfort of the gear shift are taken as the objective function, taking into account the constraint of the response ability of the shift actuator, Shift process closed-loop control problems into repeated open-loop solution to minimize the objective function of the control Finally, an offline simulation experiment is carried out to verify the rationality and effectiveness of the controller.