Design of control architecture based search algorithm for fault??tolerant control system

This article focuses on the design of the control system instrumentation. It proposes an algorithm for determining the architecture of a control system. This algorithm is based on a structural model that links the physical variables, the measures and the control variables. A method to optimize the system according to its cost as a criteria and its dependability as constraints are presented. This constraint uses a Fault Tolerant Level (FTL) that specifies the dependability and fixes the number of failures that can induce the unavailability of system. In this context, the optimization consists in finding the instrumentation that satisfies FTL as the constraints and that has the lowest financial cost. The main contributions of this paper are: i) The development of an algorithm for finding all paths of the control u(t) according to the measures provided by the sensors and actuators and based on the constraints of structural model. ii) Formalization of the optimization problem that takes into account the costs of instruments and a specified FTL. The speed control system of an electrical vehicle is used as an illustrative example.