Patent ID: 7668704

Claim:
A method for simulating behavior of an engine compressor or turbine comprising the steps of: providing an engine control module for controlling the operation of the engine; providing a model means connected to said engine control module for generating a simulation of an operational behavior of the turbine whereby said engine control module is responsive to the simulation in real time for controlling the operation of the engine; and providing a program for engine control which includes the steps of a. defining a mass flux at an interface between upstream and downstream nodes in a turbine or compressor as a function of a mass flux at the interface at a previous time, an upstream mass flux, an upstream velocity, a downstream mass flux, a downstream velocity, an area of the interface, an upstream static pressure, a downstream static pressure, and a momentum source, said step being performed by defining the mass flux at time “n+1” as equal to the mass flux at time “n” plus a value obtained by multiplying a quantity by the ratio of the time between “n” and “n+1” to a distance between the upstream and downstream nodes; b. providing look up maps or a calculation of steady state values of mass flow and pressures wherein the steady state mass flux and enthalpy change are functions of a rotational speed of the compressor or turbine, an inlet temperature, an inlet pressure and an outlet pressure, or wherein an outlet steady state pressure or a steady state pressure ratio are functions of the rotational speed, the mass flux, the inlet pressure and the inlet temperature; c. calculating the momentum source at the interface using the steady state values in the look up maps or the calculation of steady state values; and d. simulating the behavior of the turbine or compressor by performing step c. at a first interface between an inlet duct and a control volume and a second interface between the control volume and an outlet duct.