Reliability and Safety Modeling of Fault Tolerant Control System

This paper proposes a generalized approach of reliability and safety modeling for fault tolerant control system based on Markov model. The reliability and safety function, computed from the transition probability of the Markov process, provides a proper quantitative measure of the fault tolerant control system because it incorporates the deadline, failure detection and fault isolation, permanent and correlated fault. State transition diagram was established based on the state transition of the system. State transition equation could be obtained by state transition diagram. Different state probability diagrams were acquired with different parameters of failure rate, recovery rate from transient fault, failure detection rate and fault isolation rate.