Risk-Averse Model Predictive Control for Racing in Adverse Conditions
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866929554426167296 |
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| author | Lew, Thomas Greiff, Marcus Djeumou, Franck Suminaka, Makoto Thompson, Michael Subosits, John |
| author_facet | Lew, Thomas Greiff, Marcus Djeumou, Franck Suminaka, Makoto Thompson, Michael Subosits, John |
| contents | Model predictive control (MPC) algorithms can be sensitive to model mismatch when used in challenging nonlinear control tasks. In particular, the performance of MPC for vehicle control at the limits of handling suffers when the underlying model overestimates the vehicle's capabilities. In this work, we propose a risk-averse MPC framework that explicitly accounts for uncertainty over friction limits and tire parameters. Our approach leverages a sample-based approximation of an optimal control problem with a conditional value at risk (CVaR) constraint. This sample-based formulation enables planning with a set of expressive vehicle dynamics models using different tire parameters. Moreover, this formulation enables efficient numerical resolution via sequential quadratic programming and GPU parallelization. Experiments on a Lexus LC 500 show that risk-averse MPC unlocks reliable performance, while a deterministic baseline that plans using a single dynamics model may lose control of the vehicle in adverse road conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_17183 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Risk-Averse Model Predictive Control for Racing in Adverse Conditions Lew, Thomas Greiff, Marcus Djeumou, Franck Suminaka, Makoto Thompson, Michael Subosits, John Robotics Systems and Control Optimization and Control Model predictive control (MPC) algorithms can be sensitive to model mismatch when used in challenging nonlinear control tasks. In particular, the performance of MPC for vehicle control at the limits of handling suffers when the underlying model overestimates the vehicle's capabilities. In this work, we propose a risk-averse MPC framework that explicitly accounts for uncertainty over friction limits and tire parameters. Our approach leverages a sample-based approximation of an optimal control problem with a conditional value at risk (CVaR) constraint. This sample-based formulation enables planning with a set of expressive vehicle dynamics models using different tire parameters. Moreover, this formulation enables efficient numerical resolution via sequential quadratic programming and GPU parallelization. Experiments on a Lexus LC 500 show that risk-averse MPC unlocks reliable performance, while a deterministic baseline that plans using a single dynamics model may lose control of the vehicle in adverse road conditions. |
| title | Risk-Averse Model Predictive Control for Racing in Adverse Conditions |
| topic | Robotics Systems and Control Optimization and Control |
| url | https://arxiv.org/abs/2410.17183 |