Robust fault detection for nonlinear Hessenberg systems

This paper deals with the problem of disturbance decoupling subspace for nonlinear Hessenberg systems. The approach is based on a relation between the relative degree from the unknown input to the output variables for nonlinear Hessenberg systems. The major advantage for this class of systems is that a decoupled system can be obtained analytical without solving partial differential equations. Moreover this transformation can be used to define the structure of a reduced system where different nonlinear filter design procedures can be used to solve the fault detection problem, since the subspace is uniform observable.