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Adaptive Model Predictive Fault-Tolerant Control for Four-Wheel Independent Steering Vehicles with Sensitivity Estimation

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Abstract

This paper presents an adaptive model predictive fault-tolerant control (FTC) algorithm based on sensitivity estimation and exponential forgetting-based recursive least squares (RLS) for four-wheel independent steering vehicles. The model predictive control algorithm was designed according to physical constraints for four-wheel independent steering control with adaptive integral action. To improve the control performance in transient and steady-state regions, sensitivity-based adaptive rules for the weighting factor of the model predictive controller and integral gain were developed using the gradient descent method. The sensitivity was defined by a virtual relationship function and was estimated using RLS with a forgetting factor. Additionally, a FTC strategy with the equality constraint was proposed for enhancing the yaw-rate tracking control performance despite the existence of faults in the steering system. The proposed fault-tolerant steering control algorithm was developed in a MATLAB/Simulink environment, and its performance was evaluated via co-simulation in the MATLAB/Simulink and CarMaker software programs under various evaluation scenarios.

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Abbreviations

\(\dot{\psi}\) :

yaw rate, rad/s

\(\dot{\psi}_{\text{desired}}\) :

desired yaw rate, rad/s

m :

vehicle mass, kg

l f :

distance between mass center and front axle, m

l r :

distance between mass center and rear axle, m

l r :

distance between mass center and rear axle, m

l r :

distance between mass center and rear axle, m

I z :

rotational inertia of z-axis, kgm2

F x,i :

longitudinal force, N

C:

cornering stiffness, N/rad

F y,i :

lateral force, N

t w :

track tread, m

\(e_{\dot{\psi}}\) :

yaw-rate error, rad/s

δ :

wheel angle, rad

δ dri :

driver wheel input, rad

Δδ c :

controlled input, rad

Δδ opt :

MPC controlled input, rad

Δδ int :

integral controlled input, rad

δ total :

total wheel angle, rad

C int/C r :

estimated coefficient for integral/weighting factor

γ int / γ r :

adaptation gain for integral/weighting factor

ε int / ε r :

stability factor for integral/weighting factor

v x/v y/v z :

longitudinal/lateral/vertical velocity

A/A d/A e :

system matrix

B/B d/B e :

input matrix

F e :

disturbance matrix

w :

disturbance

x/x d/x e/x des :

state matrix

x, y, z :

longitudinal, lateral, and vertical

1, 2, 3, 4:

front-left, front-right, rear-left, and rear-right

ns :

neutral-state

des :

desired

d :

discretized

e,d :

discretized error

in :

inequality constraint

eq :

equality constraint

opt :

optimal control input

c :

controlled input

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Acknowledgement

This work was supported by a research grant from Hyundai Motor Group.

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Correspondence to Kwang Seok Oh.

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Oh, S.C., Song, T.J., Kim, M.J. et al. Adaptive Model Predictive Fault-Tolerant Control for Four-Wheel Independent Steering Vehicles with Sensitivity Estimation. Int.J Automot. Technol. 24, 829–850 (2023). https://doi.org/10.1007/s12239-023-0068-8

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  • DOI: https://doi.org/10.1007/s12239-023-0068-8

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