提出实时自适应车辆预测模型,提升无人赛车路径跟踪精度。
Vehicle Prediction Model for Enhanced MPC Path Tracking in Formula Student Driverless

- 融合历史数据与实时驾驶状态,分三阶段建模
- 预测精度最高提升57%,且具备不确定性评估能力
- 已实现在真实无人赛车上的路径跟踪应用
自动驾驶赛车在公式学生无人驾驶赛事中运行于物理极限附近,导致车辆行为高度非线性,尤其在狭窄赛道上路径跟踪难度加大。模型预测控制(MPC)常用于解决此问题,其性能高度依赖预测模型的准确性。本文提出一种新型实时可执行的车辆预测模型,通过结合过往运行数据与当前驾驶状况,实现对变化条件的自适应。该模型由三个连续子模型构成:基准运动学自行车模型、离线贝叶斯线性回归(BLR)模型和在线稀疏高斯过程回归(SGPR)模型。该方法能高效整合全部可用数据,计算开销增长有限,确保高预测精度并从运行初期即提供定量不确定性评估。相比现有方法,预测精度最高提升57%。此外,已在真实公式学生赛车上成功验证该模型在基于MPC的路径跟踪控制器中的实用性。
原文摘要 · Abstract (English)
Autonomous race cars, such as in Formula Student Driverless, operate close to their physical handling limits. The resulting highly nonlinear vehicle behavior increases the path tracking complexity, especially on narrow tracks. Model Predictive Control (MPC) is commonly used to address this issue, a method whose performance is closely tied to the accuracy of the underlying prediction model. This paper presents a novel, real-time capable prediction model for autonomous race cars that adjusts to changing conditions by combining information from past runs and the current driving situation. Our model is divided into three consecutive submodels: a nominal Kinematic Bicycle Model, an offline Bayesian Linear Regression (BLR) model, and an online Sparse Gaussian Process Regression (SGPR) model. The proposed approach enables efficient integration of all available data without significantly increasing computational cost, ensuring high prediction accuracy and a quantitative uncertainty assessment right from the start of the run. Compared to existing approaches, an improvement in prediction accuracy of up to 57% was achieved. Further, we successfully demonstrated the practical applicability of the model within an MPC-based path tracking controller on a real Formula Student race car.
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