Multivariable control altitude demonstration on the F100 turbofan engine

Aircraft Turbine Engine Control Research at NASA Glenn Research Center

“…The control design (DeHoff et al 1977) (see Fig. 7) was verified extensively at NASA's hybrid simulation facility (Szuch et al 1977), and followed by a successful testing on an F100 engine in the GRC altitude test facilities (Lehtinen et al 1979). As discussed in an earlier section, even the current commercial engine control logic consists of controlling just the fuel flow (WF) in a "closed-loop" (feedback) manner, with the other variable geometry effectors such as inlet guide vanes on an "open-loop" schedule based on measured parameters that define the operating conditions.…”