The fault tolerant control problem for a DC motor system is investigated in a cloud environment. Packet dropout phenomenon\nintroduced by the limited-capacity communication channel is considered. Actuator faults are taken into consideration and fault\ndiagnosis andfault tolerant controlmethods towards actuator faults areproposedtoenhance the reliability of thewhole cloud-based\nDC motor system. The fault diagnosis unit is then established with purpose of obtaining fault information.When the actuator fault\nis detected by comparing the residual signal with a predefined threshold, a residual matching approach is utilized to locate the fault.\nThe fault can be further estimated by a least-squares filter. Based on the fault estimation, a fault tolerant controller is designed to\nguarantee the stability as well as the control performance of the DC motor system. Simulation result on a DC motor system shows\nthe efficiency of the fault tolerant control method proposed in this paper.
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