Mandl, P., Edelmann, J., & Plöchl, M. (2023, August). Enhancing controllability and path tracking with overactuated autonomous vehicles [Conference Presentation]. 28th IAVSD International Symposium on Dynamics of Vehicles on Roads and on Tracks - IAVSD 2023, Ottawa, Canada.
E325-01 - Forschungsbereich Technische Dynamik und Fahrzeugdynamik
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Date (published):
Aug-2023
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Event name:
28th IAVSD International Symposium on Dynamics of Vehicles on Roads and on Tracks - IAVSD 2023
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Event date:
21-Aug-2023 - 25-Aug-2023
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Event place:
Ottawa, Canada
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Keywords:
control allocation; path tracking; overactuated vehicles
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Abstract:
Motion control of autonomous vehicles presents unique challenges in terms of stability and obstacle avoidance.
Especially in critical driving conditions such as $\mu$-low, autonomous vehicles may reach the limits of stability and require the use of all available lateral friction to maintain control and stably follow a reference path, while also taking into consideration collision avoidance.
Overactuated vehicles can mitigate the issue of limited stability and controllability by optimal use of the lateral friction potential by using additional actuators.
To address these challenges, this paper introduces a novel control architecture that combines a linear model predictive controller for tracking with model following and nonlinear control allocation technique. The control allocation method uses torque vectoring and rear wheel steering to extend the linear understeer characteristics and increase the maximum achievable lateral acceleration. Simulations demonstrate that this method reduces the path tracking error and enhances stable maneuvering in critical driving conditions by increasing the vehicle's lateral capabilities.
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Project title:
Zentrales System zur Unterstützung von automatisierten Fahrzeugtests und Betrieb: FO999886467 (FFG - Österr. Forschungsförderungs- gesellschaft mbH)