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Automatic take-off method and device for an airplane

  • US 7,835,829 B2
  • Filed: 12/03/2007
  • Issued: 11/16/2010
  • Est. Priority Date: 12/05/2006
  • Status: Active Grant
First Claim
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1. An automatic take-off method for an airplane, whereby, for an elevation guidance of the airplane on a take-off, the following successive series A of steps is performed, automatically and repetitively, on said take-off, comprising:

  • A, a) determining an elevation guidance objective, using a flight management system, which represents an angular profile along the pitch axis of the airplane, said angular profile being expressed according to a first parameter;

    A. b) measuring, using a standard trim device, the current value of said first parameter on the airplane;

    A. c) from said elevation guidance objective and said measured current value of said first parameter, determining, using an automatic piloting device, a vertical piloting objective which is expressed as rate of pitch;

    A. d) from said vertical piloting objective, determining, using a flight control computer, elevator deflection commands for the airplane; and

    A. e) the determined elevator deflection commands are applied to operators of said elevators, wherein, in the step A. c), determining said vertical piloting objective QcPA from the following expression;


    QcPA=k

    (θ

    c−

    θ

    eff
    )in which;

    k1 is a predetermined gain;

    θ

    c represents said angular profile which can be used to obtain optimized performance levels according to take-off conditions; and

    θ

    eff represents a measured current value of said first parameter,wherein for a lateral guidance of the airplane on the take-off, the following successive series of steps B is performed, automatically and repetitively, on said take-off, comprising;

    B. a) determining a lateral guidance objective which represents a particular guidance reference and which is expressed according to at least one second parameter;

    B. b) measuring the current value of said second parameter on the airplane;

    B. c) from said lateral guidance objective and said measured current value of said second parameter, determining a lateral piloting objective which is expressed as rate of yaw;

    B. d) from said lateral piloting objective, determining actuation commands to control elements acting on the yaw of the airplane; and

    B. e) applying said determined elevator actuation commands to operators of said elements,wherein said guidance reference concerns a second parameter which is defined for the runway used by the airplane for the take-off,wherein said second parameter is the heading of the runway, andwherein, in the step B. c), said lateral piloting objective re is determined from the following expression;


    rc=reff+[k2

    reff+k




    c−

    ψ

    eff
    )]/k4in which;

    k2, k3 and k4 are predetermined gains,reff is a measured current value of the rate of yaw of the airplane,ψ

    c represents said guidance reference which corresponds to the geographic heading of the runway, andψ

    eff is a measured current value of the heading of the airplane.

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