Patent ID: 6063129
Filing Date: 2000-05-16
Classification: G05B

Abstract:
A method of monitoring changes in an engine, said method specifically monitoring n performance parameters of said engine by means of n performance parameters changes in the form of a multidimensional vector dP, said engine having a plurality of control inputs and resulting in m engine outputs, where n and m are positive integers with n greater than m, said method comprising the steps of:(i) providing a computer model of the engine, said model having a plurality of control inputs and having m model outputs;(ii) initializing said multidimensional vector dP to zero;(iii) storing at least one non-square matrix C of sensitivity coefficients which relates changes in performance parameters of the engine dP to a vector of differences between engine sensor outputs and computer model outputs dx, where dx=CdP;(iv) operating said engine;(v) computing said m model outputs based upon said plurality of control inputs and said vector of performance chances dP;(vi) comparing said computed m model outputs to m sensor engine outputs and calculating a vector of output sensor changes dx;(vii) applying singular value decomposition to compute a revised dPe, where C=US.sup.S :0V.sup.T and V.sub.R (S.sup.S).sup.-1 U.sup.T is the pseudoinverse of C.