Administrator by China Associction for Science and Technology
Sponsored by China Society of Automotive Engineers
Published by AUTO FAN Magazine Co. Ltd.

Automotive Engineering ›› 2023, Vol. 45 ›› Issue (12): 2260-2271.doi: 10.19562/j.chinasae.qcgc.2023.12.008

Special Issue: 底盘&动力学&整车性能专题2023年

Previous Articles     Next Articles

Parameter-Free H Control of Vehicle Active Suspension Based on Q-learning

Gang Wang,Kunpeng Li,Hui Jing(),Suqi Liu   

  1. Guilin University of Electronic Technology,Guangxi Key Laboratory of Manufacturing System andAdvanced Manufacturing Technology,Guilin  541004
  • Received:2023-04-11 Revised:2023-06-02 Online:2023-12-25 Published:2023-12-21
  • Contact: Hui Jing E-mail:jinghuiedu@163.com

Abstract:

Active suspension plays a crucial role in the all-by-wire chassis of intelligent vehicles, enabling full-vector control of the vehicle chassis in conjunction with various driven-by-wire execution systems, significantly improving driving safety. However, the traditional control method involves calibrating numerous vehicle model parameters, which reduces the efficiency of control development. On this basis, a parameter-free H control method for the vehicle's active suspension is studied in this paper. Firstly, an approximate dynamic programming model based on the behavior dependence of the active suspension is established, transforming the H control problem into a zero-sum game process involving pavement disturbance and control behavior. Secondly, an adaptive evaluation method is used to set the action network and the critical network and online Q-learning is used to solve the system's Game algebraic Riccati equation, which provides an optimal control solution without requiring model parameters. The stability analysis demonstrates that the proposed method can converge to the Nash equilibrium point of the system. Finally, a hardware-in-the-loop system is built to verify the effectiveness of the proposed method, and the active control simulation is carried out for the bump pavement and random pavement with different road grades. The results show that the control method based on Q-learning has the optimal control effect, which can improve vehicle ride comfort and handling stability in the low frequency range.

Key words: full-car active suspension, parameter-free, H control, Q-learning