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arXiv 2011.10721eess.SYcs.SY
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安全临界控制的高相对度控制障碍函数学习

Learning Control Barrier Functions with High Relative Degree for Safety-Critical Control

Chuanzheng Wang, Yinan Li, Yiming Meng, Stephen L. Smith, Jun Liu

摘要:

控制障碍函数在解决具有安全保证的控制问题方面已经显示出巨大的成功。这些方法通常通过求解在线二次规划问题来找到下一个安全控制输入。然而,模型的不确定性是一个很大的挑战,综合控制器。这可能导致不安全控制行为的产生,造成严重后果。在本文中,我们开发了一个学习框架来处理系统的不确定性。我们的方法主要集中在学习的动态的控制障碍函数,特别是对于高相对于系统的程度。我们表明,对于每一个订单,控制障碍函数的时间导数可以分离成标称控制障碍函数的时间导数和一个余数。这意味着我们可以使用神经网络来学习余数,以便我们可以近似真实控制障碍函数的动态。我们通过仿真表明,我们的方法可以生成安全的轨迹下的参数不确定性,使用差分驱动机器人模型。

英文摘要:

Control barrier functions have shown great success in addressing control problems with safety guarantees. These methods usually find the next safe control input by solving an online quadratic programming problem. However, model uncertainty is a big challenge in synthesizing controllers. This may lead to the generation of unsafe control actions, resulting in severe consequences. In this paper, we develop a learning framework to deal with system uncertainty. Our method mainly focuses on learning the dynamics of the control barrier function, especially for high relative degree with respect to a system. We show that for each order, the time derivative of the control barrier function can be separated into the time derivative of the nominal control barrier function and a remainder. This implies that we can use a neural network to learn the remainder so that we can approximate the dynamics of the real control barrier function. We show by simulation that our method can generate safe trajectories under parametric uncertainty using a differential drive robot model.

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