Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (9): 2687-2696.doi: 10.13229/j.cnki.jdxbgxb.20221401

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Slip rate control method based on model predictive control

Shou-tao LI1,2(),Lu YANG2,Ru-yi QU2,Peng-peng SUN2,Ding-li YU3   

  1. 1.State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China
    2.College of Communication Engineering,Jilin University,Changchun 130022,China
    3.School of Engineering and Technology,Liverpool John Moores University,Liverpool L33AF,UK
  • Received:2022-11-03 Online:2024-09-01 Published:2024-10-29

Abstract:

In automotive electronic controls, safety issues are always of paramount importance. Therefore, this paper proposes a slip rate control method based on MPC to improve the longitudinal stability of four-wheel-wheel electric vehicles during emergency braking. Firstly, the vehicle longitudinal velocity estimator based on extended Kalman filter accurately estimates the longitudinal speed of the vehicle, and then the recursive least squares method based on limited memory is used to identify the optimal slip rate of the vehicle under the emergency braking condition. Secondly, the upper model predicts that the controller tracks the optimal slip rate, optimizes the braking torque required by the front and rear wheels under different road surface attachment conditions to meet the safety constraints, and the lower torque distribution controller distributes hydraulic and regenerative braking torque under the constraints of battery state of charge to improve the energy recovery efficiency. Finally, simulation experiments are carried out under different working conditions and it is shown that the proposed control system can ensure the safety and reliability of the emergency braking process.

Key words: vehicle engineering, slip rate control, model predictive control, optimal slip rate identification, longitudinal velocity estimation

CLC Number: 

  • TP273

Fig.1

Overall structure of slip rate control strategy"

Fig.2

Flow chart of optimal slip rate identification algorithm based on RFMLS"

Fig.3

Comparison of actual value and estimated value"

Fig.4

Estimation error"

Fig.5

Slip rate identification"

Fig.6

Simulation under wet asphalt pavement conditions"

Fig.7

Simulation under ice and snow road conditions"

Fig.8

Simulation results of vehicle braking deceleration"

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