Fuzzy logic based fuel flow selection system

摘要

A fuzzy logic based fuel flow selection (control) system is presented. Control loops are used to provide desired engine fuel flow control. These loops receive engine operating parameters and provide fuel flow command values in accordance with corresponding transfer functions. These command values are presented to selection logic, which provides a command value based on outputs of the control loops. The command value integrated by a common integrator to provide and integrated command value which is the fuel flow command that is presented to a fuel metering unit at the engine. Each loop has a level of authority assigned to it, which is computed in terms of fuzzy rules and membership functions. Thus at any given moment, more than one loop may be in control to differing levels of authority, whereby the present invention provides a smoother transition between loops competing for control with an attendant increase in system performance.