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Apparatus and methods for controlling aircraft thrust during a climb

  • US 5,299,765 A
  • Filed: 12/23/1991
  • Issued: 04/05/1994
  • Est. Priority Date: 12/23/1991
  • Status: Expired due to Term
First Claim
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1. Method for adjusting aircraft engine thrust, the method comprising the steps of:

  • a. selecting a climb gradient for climbing the aircraft;

    b. flying the aircraft at a first climb attitude during a first climb segment;

    c. reducing a climb attitude of the aircraft at an end of the first climb segment from the first climb attitude;

    d. flying the aircraft at a selected airspeed during a second climb segment;

    e. measuring a climb gradient of the aircraft;

    f. determining a reference thrust level by (1) determining a first value which is a function of the selected climb gradient. (2) determining a second value which is independent of aircraft airspeed changes by determining an acceleration value of the aircraft and combining the acceleration value and the measured climb gradient, (3) determining a difference between the first value and the second value to generate and error value, and (4) converting the error value to a reference thrust level;

    g. sensing an actual thrust level of the engine; and

    h. adjusting the actual thrust level of the engine so that the actual thrust level approaches the reference thrust level during the climb attitude reduction so that the aircraft climbs at the selected climb gradient during the second climb segment.

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