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arXiv 2004.01761eess.SYcs.SY
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利用控制障碍函数和模型预测控制策略的多速率控制设计

Multi-Rate Control Design Leveraging Control Barrier Functions and Model Predictive Control Policies

Ugo Rosolia, Aaron D. Ames

摘要:

在本文中,我们提出了一个多速率控制架构的安全关键系统。我们考虑一个高层次的规划器和一个低层次的控制器,它们工作在不同的频率。这种多速率行为是由一个分段的非线性模型,它在一个连续和离散的水平上发展。首先,我们提出了充分条件,保证递归约束满足的闭环系统。之后,我们提出了一种控制设计方法,利用控制障碍函数(CBF)的低级别控制和模型预测控制(MPC)的政策,高层次的规划。控制障碍函数采用完全非线性动态模型设计,MPC基于简化的规划模型。当非线性系统为控制仿射系统且高层规划模型为线性系统时,通过求解各层的凸优化问题来计算控制动作。最后,我们展示了所提出的策略的有效性,在一个仿真例子中,低级别的控制动作更新的频率比高级别的命令。

英文摘要:

In this paper we present a multi-rate control architecture for safety critical systems. We consider a high level planner and a low level controller which operate at different frequencies. This multi-rate behavior is described by a piecewise nonlinear model which evolves on a continuous and a discrete level. First, we present sufficient conditions which guarantee recursive constraint satisfaction for the closed-loop system. Afterwards, we propose a control design methodology which leverages Control Barrier Functions (CBFs) for low level control and Model Predictive Control (MPC) policies for high level planning. The control barrier function is designed using the full nonlinear dynamical model and the MPC is based on a simplified planning model. When the nonlinear system is control affine and the high level planning model is linear, the control actions are computed by solving convex optimization problems at each level of the hierarchy. Finally, we show the effectiveness of the proposed strategy on a simulation example, where the low level control action is updated at a higher frequency than the high level command.

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