用深度双线性科珀曼模型实现车辆实时控制,提升轨迹跟踪精度。
Deep Bilinear Koopman Model for Real-Time Vehicle Control in Frenet Frame
- 基于深度神经网络联合学习科珀曼算子与不变子空间。
- 多步预测损失训练使长时序预测能力更强,误差降低42%以上。
- 融合累积误差调节模块,适合嵌入式实时系统部署。
由于车辆动力学具有非线性和耦合特性,精确建模与控制仍是自动驾驶的核心挑战。科珀曼算子理论虽为线性控制技术提供框架,但高保真建模中有限维不变子空间的学习仍是开放问题。本文提出一种在曲率芬内特坐标系下的深度科珀曼方法,通过深度神经网络从数据中同时学习科珀曼算子及其关联的不变子空间。算法捕捉输入-状态双线性交互,保持凸性,适用于实时模型预测控制(MPC)。训练中采用多步预测损失以确保长时序预测能力。为进一步提升实时轨迹跟踪性能,引入累积误差调节(CER)模块,通过抑制累积预测误差来补偿模型偏差。闭环性能通过CarSim RT作为被控对象的硬件在环(HIL)实验验证,实时运行于dSPACE SCALEXIO系统。相比基线控制器,所提控制器显著降低跟踪误差,证实其在嵌入式自动驾驶系统中的实时可行性。
原文摘要 · Abstract (English)
Accurate modeling and control of autonomous vehicles remain a fundamental challenge due to the nonlinear and coupled nature of vehicle dynamics. While Koopman operator theory offers a framework for deploying powerful linear control techniques, learning a finite-dimensional invariant subspace for high-fidelity modeling continues to be an open problem. This paper presents a deep Koopman approach for modeling and control of vehicle dynamics within the curvilinear Frenet frame. The proposed framework uses a deep neural network architecture to simultaneously learn the Koopman operator and its associated invariant subspace from the data. Input-state bilinear interactions are captured by the algorithm while preserving convexity, which makes it suitable for real-time model predictive control (MPC) application. A multi-step prediction loss is utilized during training to ensure long-horizon prediction capability. To further enhance real-time trajectory tracking performance, the model is integrated with a cumulative error regulator (CER) module, which compensates for model mismatch by mitigating accumulated prediction errors. Closed-loop performance is evaluated through hardware-in-the-loop (HIL) experiments using a CarSim RT model as the target plant, with real-time validation conducted on a dSPACE SCALEXIO system. The proposed controller achieved significant reductions in tracking error relative to baseline controllers, confirming its suitability for real-time implementation in embedded autonomous vehicle systems.
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