Author : Rongrong Wang
Release : 2013
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Fault-tolerant Control and Fault-diagnosis Design for Over-actuated Systems with Applications to Electric Ground Vehicles by : Rongrong Wang
Download or read book Fault-tolerant Control and Fault-diagnosis Design for Over-actuated Systems with Applications to Electric Ground Vehicles written by Rongrong Wang. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation addresses the fault-tolerant (FT) control and fault detection and diagnosis (FDD) problems for certain over-actuated systems with applications to electric ground vehicles. Two different control effort grouping methods are proposed to transfer the over-actuated system model to a square system to facilitate the controller design. By these control effort grouping method, the dynamics of the nonlinear over-actuated system with actuator faults is further modeled based on a generalized actuator fault model. A sliding mode control technique based FT controller is first designed to attenuate the disturbance and the uncertainty caused by the actuator fault. In order to avoid the possible chatting effects from the sliding model controller, a gain-scheduling robust controller based on the linear-parameter varying (LPV) technology is designed to against the actuator faults. The eigenvalue positions of the system matrix of the closed-loop system are also constrained into a disk to obtain better transient responses. Both of the proposed FT control methods can automatically distribute control efforts to each of the actuators without using the control allocation algorithms. In the FDD design, the actuator redundancy and identicalness are used to estimate the unknown parameter which is a common parameter of the actuators. An observer is employed to estimate the unknown parameter from each respective actuator, and the accurate estimate of the unknown parameter is obtained by rejecting the erroneous estimate of the faulty actuator though a voting scheme. The obtained accurate estimate of the unknown parameter is then adopted to calculate the residuals and detect the actuator fault. The external yaw moment generated from a four-wheel-independently-actuated (FWIA) ground vehicle, together with the automatic steering using an active steering system, make it possible to simultaneously regulate the vehicle lateral velocity and track the desired yaw rate. FT controller design for a FWIA vehicle equipped an active steering system is especially investigated.
