Patent ID: 7908043
Filing Date: 2011-03-15
Classification: G05D

Abstract:
1. A method of active control of a roll of an aircraft, comprising: a) generating a roll objective, which is expressed as a roll parameter related to the roll and which is applied to the aircraft; b) determining effective values of parameters of the aircraft; c) calculating a deflection order Sp on the basis of said roll objective and of said effective values; and d) applying said deflection order δp exclusively to airfoils of the aircraft, which are efficient on a roll axis, so as to control the roll, wherein in step c): a first value is calculated on the basis of said roll objective; and said deflection order δp is calculated on the basis of the first value and of said effective values which comprise the effective value of the roll rate, by using at least one integration function, and wherein c1) a roll acceleration order is calculated on the basis of said roll objective; and c2) said deflection order Sp is calculated with the aid of the following expressions: in which: P1 represents said roll acceleration order; ρ is the density of the air; V is the speed of the aircraft; S is a reference area of the aircraft; l is a reference length of the aircraft; Cl represents a roll coefficient; I represents the roll inertia of the aircraft ∂Cl/∂δp represents an effectiveness coefficient; K represents a predetermined coefficient; Peff represents the effective value of the roll rate; ∫ illustrates an integration function; and δpeff is the effective deflection angle of ailerons of the aircraft.