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In T.S.B. 10-024 issued on Oct. 6, Acura's parent company, Honda, said the noise in 2009 and some 2010 models with the 4-cylinder engine might be caused by a faulty actuator for the variable valve timing.
The FDIFTC system monitors closed-loop process residuals in order to detect and isolate a faulty actuator.
The plant with the faulty actuator is modified adding the virtual actuator block that masks the fault.
A robust super twisting fault estimator is proposed to precisely estimate the defective torque amplitude of the faulty actuator in finite time.
It is proven that attitude errors can asymptotically converge to a small neighborhood of equilibrium point in the face of faulty actuator, model uncertainties, external disturbances and even actuator saturation.
These reactions may employ hardware redundancy (i.e. switching from a faulty actuator to another, intact one) or analytical redundancy (i.e. switching from a faulty sensor to a "model sensor" or "soft sensor").
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An actuator switching policy is used to arrange switching from faulty actuators to healthy ones based on performance enhancement arguments.
The faulty actuators are considered as a disturbance signal to the system which is augmented with system disturbance input.
Due to the fact that unstable subsystems cannot be avoided in many applications, the reliable stabilization problems for switched systems with faulty actuators are solved in [27 29] under the restrictions that not all subsystems are stable.
It is shown that with the proposed control strategy, both the tracking errors of the leading helicopter and the attitude synchronization errors of each following helicopter are bounded in the existence of faulty actuators and actuator saturations.
Without the requirement of additional fault detection mechanism, the switching function is designed to automatically locate and turn off the unknown faulty actuators by observing a control performance index.
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