论文标题
强大的模型预测性纵向位置跟踪自动驾驶汽车的控制控制
Robust Model Predictive Longitudinal Position Tracking Control for an Autonomous Vehicle Based on Multiple Models
论文作者
论文摘要
这项工作的目的是通过内燃机控制自动驾驶汽车的纵向位置。动力总成具有固有的死时间特征,并且对物理状态的限制适用,因为车辆既不能随意加速强大,也不能迅速驱动。模型预测控制器(MPC)能够应对上述两个系统属性。 MPC在很大程度上依赖于模型,因此通过输入/输出数据系统从加速度数据识别进行了如何获得非线性系统的多个线性状态空间预测模型的策略。在车辆动力学的不同区域中确定了模型,以获得更准确的预测。剩余的植物模型不匹配可以表示为添加性干扰,可以通过稳健的控制理论来处理。因此,描述了对应用强大的MPC跟踪控制理论的模型的修改。然后,设计了一个保证稳健约束满意度和递归可行性的控制器。作为下一步,讨论了将控制器应用于多个模型的修改。在这种情况下,提供了模型切换策略,并指出了理论和计算限制。最后,呈现和讨论模拟结果,包括系统之间切换时的计算负载。
The aim of this work is to control the longitudinal position of an autonomous vehicle with an internal combustion engine. The powertrain has an inherent dead-time characteristic and constraints on physical states apply since the vehicle is neither able to accelerate arbitrarily strong, nor to drive arbitrarily fast. A model predictive controller (MPC) is able to cope with both of the aforementioned system properties. MPC heavily relies on a model and therefore a strategy on how to obtain multiple linear state space prediction models of the nonlinear system via input/output data system identification from acceleration data is given. The models are identified in different regions of the vehicle dynamics in order to obtain more accurate predictions. The still remaining plant-model mismatch can be expressed as an additive disturbance which can be handled through robust control theory. Therefore modifications to the models for applying robust MPC tracking control theory are described. Then a controller which guarantees robust constraint satisfaction and recursive feasibility is designed. As a next step, modifications to apply the controller on multiple models are discussed. In this context, a model switching strategy is provided and theoretical and computational limitations are pointed out. Lastly, simulation results are presented and discussed, including computational load when switching between systems.