Abstract
Presented here is a design of the four-dimensional mode for an integrated autopilot/autothrottle control system named Total Energy Control System. This design involves integrating a four-dimensional flight trajectory generator with the Total Energy Control System to create an outer-loop time error control law and integrating spoilers with the Total Energy Control System to increase the energy bleedoff capacity of the system during descent. The resulting system follows a precomputed four-dimensional profile in cruise, except if there is a large time error when the system is engaged. In such a case, the system generates a speed profile to null out the time error by the top of descent. During descent, the system follows a fixed profile by employing both throttles and spoilers. The system was tested on a full nonlinear simulation and all portions of the system were shown to perform as desired.
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