Patent ID: 6223120
Filing Date: 2001-04-24
Classification: F02D,G01M

Abstract:
A method of estimating the torque produced by each cylinder in a reciprocating machine, the method comprising the steps of:providing a system including a reciprocating machine having a plurality of cylinders;measuring an angular response at at least one location in said system to define a measured angular response;creating a mathematical model representing the angular dynamics of said system, said model associating angular responses with torques at various locations in said system;parameterizing said torques as a function of at least one parameter;assembling a set of frequency domain equations relating said measured angular response to said at least one parameter for a selected analysis frequency;constructing simultaneously a plurality of said sets of frequency domain equations for a plurality of said selected analysis frequencies by repeating said parameterizing and assembling steps for said plurality of selected analysis frequencies;repeating said constructing step at least until said plurality of sets of frequency domain equations are defined as over-determined; andsolving said plurality of said sets of frequency domain equations to determine said at least one parameter.