Abstract
In this paper, a novel fuzzy fault tolerance algorithm is proposed for quarter vehicle active suspensions based on multi-objective constrained optimizations, which improves the riding comfort and driving safety. The objective function approach the optimal solutions via integrating multi-objective constraints as cost functions. By introducing the barrier function, the nonlinear active suspensions with multi-objective constraints are transformed into pure feedback systems without constraints. The problem is rather complicated yet challenging if the actuator faults are taken into account in quarter vehicle. The actuator faults are solved by the utilization of proportional actuation method. The unknown smooth dynamics based on physical truth are identified by exploiting the fuzzy logic knowledge. Meanwhile, the signals received in the suspensions do not violate the constraint boundary. Finally, the simulation results show that the algorithm is effective.
Highlights
Along with social progress, economic growth, and urban development, from the perspective of travel efficiency and comfort, vehicles have become a necessity for people [1]-[3]
A new adaptive fault tolerant control scheme is put forward to achieve the goals of safe driving, ride comfort and handling stability of the active suspension systems
Considering the importance of body displacement in active suspension system, a different constraint method is adopted to restrict it in a small range all the time
Summary
Along with social progress, economic growth, and urban development, from the perspective of travel efficiency and comfort, vehicles have become a necessity for people [1]-[3]. For the active suspension systems with actuator delay and actuator failure, an effective control strategy is proposed by using adaptive fault tolerant control (FTC) approaches [35]-[36], and the effectiveness of the method is verified. Motivated by the above analysis, we put forward a fuzzy adaptive tolerant control strategy for active suspension systems with multiple objective constraints. Combined with the two kinds of problems that often appear in active suspension systems, and by choosing the appropriate fault parameters, the result is more general, this kind of actuator fault processing method has great practical significance. On this basis, a fuzzy adaptive fault-tolerant controller is designed for the active suspension system. (3) The suspension space: considering the stability of suspension physical structure, the suspension space must be smaller than their maximums: zs − zw ≤ zmax where zmax is a constant
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