Active Fault-Tolerant Control Based on the Fault of Electromagnetic Hybrid Active Suspension

Farong Kou,Dapeng Wu,Jianghao Wu,Ruochen Chen,Jian Gao,Giosuè Boscato

doi:10.1155/2021/4273698

Farong Kou, Dapeng Wu + Show 4 more

Open Access

https://doi.org/10.1155/2021/4273698

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Abstract

In order to improve the ride comfort and handling stability of the vehicle and realize the recovery of vibration energy, an electromagnetic linear hybrid suspension actuator composed of linear motor and solenoid valve shock absorber is proposed. At the same time, a fault diagnosis and fault-tolerant control strategy is designed to solve the system instability caused by the fault of electromagnetic hybrid active suspension. The 1/4 vehicle two-degree-of freedom suspension model, the linear motor mathematical model, and the solenoid valve shock absorber test model are established. In this paper, the fuzzy sliding mode controller is used as the controller and the unknown input observer is used to estimate the state of the suspension. According to the residual obtained from the unknown input observer and compared with the residual threshold, the suspension fault is determined. In the case of fault, the fuzzy sliding mode controller is used to compensate the force and realize the suspension fault-tolerant control. The performance of the suspension is simulated on random road and bumped road, respectively. The simulation results show that the fault-tolerant control effect of the three performance indexes of the suspension is good, and the ride comfort and safety of the suspension are improved. Finally, the bench test is carried out, and the test results show that in the fault-tolerant control state, the root mean square value of the sprung mass acceleration is reduced by 31.69% compared with the fault state and the dynamic performance of the suspension is improved.

Highlights

Fault diagnosis technology is a comprehensive technology, which involves modern control theory, fuzzy set theory, reliability theory, and signal processing [12]
Active fault-tolerant control is to redesign the controller based on the results of fault diagnosis after a fault occurs, so that the control system is stable, and at the same time, the performance of the control system is close to the performance level when it is in a fault-free state. [18,19,20]
A fault diagnosis and fault-tolerant control method is designed based on electromagnetic linear hybrid actuator suspension (EMLHAS)

Summary

Modeling of the EMLHAS Dynamic Model

In this way, the state space equations of suspension can be expressed as follows:. There is a nonlinear relationship between the damping force, the suspension speed, and the input current of solenoid valve damper. E parameters of the polynomial model for the solenoid valve shock absorber are obtained by regression analysis method, and the polynomial coefficients are shown in Table 1 [27]. E parameters of the polynomial model for the solenoid valve shock absorber are obtained by regression analysis method, and the polynomial coefficients are shown in Table 1 [27]. en the polynomial model of the solenoid valve shock absorber is obtained by taking the identified parameter results into equation (10)

Fault-Tolerant Control of EMLHAS

Simulation Analysis

Bench Test

Findings

Conclusions