Aeronautics and astronautics – Aircraft control – Automatic
Patent
1978-09-11
1981-07-07
Miller, J. D.
Aeronautics and astronautics
Aircraft control
Automatic
364431, G05D 108
Patent
active
042770416
ABSTRACT:
An improved cruise speed control system for commercial jet aircraft is described. The basic control terms for the pitch loop are altitude error, altitude rate and washed-out speed or Mach. The basic control terms for the speed loop are Mach error, Mach rate and integrated Mach error. Other speed loop functions include a gain term which increases at low engine response rates, based on either engine rpm or engine pressure ratio (EPR), to compensate for throttle linkage hysteresis, a versine term to compensate for increased drag in turns, an inner EPR loop for damping the outer speed loop, a variable gain term as a function of Mach error to facilitate changes of commanded Mach, and a switch to disconnect Mach error and Mach rate and to increase the nominal value of EPR during periods of air turbulence.
REFERENCES:
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patent: 3627236 (1971-12-01), Hess
patent: 3662976 (1972-05-01), Gesler
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Flight Management System and Automatic Takeoff Thrust Control System, L-1011 Tristar, paper presented 2-21-77.
Marrs Graham J.
Oliver Richard J.
Potthast Alfred J.
Samuelson Roland M.
Eisenzopf Reinhard J.
Lockheed Corporation
Miller J. D.
Smith Frederic P.
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