Alan, Anil and Taylor, Andrew J. and He, Chaozhe R. and Ames, Aaron D. and Orosz, Gábor (2022) Control Barrier Functions and Input-to-State Safety with Application to Automated Vehicles. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20220714-194315874
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Abstract
Balancing safety and performance is one of the predominant challenges in modern control system design. Moreover, it is crucial to robustly ensure safety without inducing unnecessary conservativeness that degrades performance. In this work we present a constructive approach for safety-critical control synthesis via Control Barrier Functions (CBF). By filtering a hand-designed controller via a CBF, we are able to attain performant behavior while providing rigorous guarantees of safety. In the face of disturbances, robust safety and performance are simultaneously achieved through the notion of Input-to-State Safety (ISSf). We take a tutorial approach by developing the CBF-design methodology in parallel with an inverted pendulum example, making the challenges and sensitivities in the design process concrete. To establish the capability of the proposed approach, we consider the practical setting of safety-critical design via CBFs for a connected automated vehicle (CAV) in the form of a class-8 truck without a trailer. Through experimentation we see the impact of unmodeled disturbances in the truck's actuation system on the safety guarantees provided by CBFs. We characterize these disturbances and using ISSf, produce a robust controller that achieves safety without conceding performance. We evaluate our design both in simulation, and for the first time on an automotive system, experimentally.
Item Type: | Report or Paper (Discussion Paper) | ||||||||||||
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Additional Information: | This research is supported in part by the National Science Foundation, CPS Award #1932091. | ||||||||||||
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Subject Keywords: | Robust safety-critical control, control barrier functions, input-to-state safety, connected automated vehicles | ||||||||||||
Record Number: | CaltechAUTHORS:20220714-194315874 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20220714-194315874 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 115566 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | George Porter | ||||||||||||
Deposited On: | 15 Jul 2022 22:32 | ||||||||||||
Last Modified: | 15 Jul 2022 22:34 |
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