초록 ▼

A device for the automatic control of a helicopter may include two objective algorithms associated with the collective axis, each of these algorithms automatically determining a command for operating the collective pitch of the blades of the main rotor of the helicopter. The device may also include

A device for the automatic control of a helicopter may include two objective algorithms associated with the collective axis, each of these algorithms automatically determining a command for operating the collective pitch of the blades of the main rotor of the helicopter. The device may also include two objective algorithms associated with pitching axis that function simultaneously and automatically determine a command for operating the tilting of the disk of the main rotor. A first selection device automatically selects the objective algorithm whose command is used for the collective axis, and a second selection made by the first selection device, the objective algorithm whose command is used for the pitching axis.

대표청구항 ▼

1. A device for the automatic control of a helicopter comprising a main forward motion and lift rotor capable of being controlled at least along a collective axis and along a pitching axis, said device comprising:at least one objective law in respect of the pitching axis, the aim of such an objectiv

1. A device for the automatic control of a helicopter comprising a main forward motion and lift rotor capable of being controlled at least along a collective axis and along a pitching axis, said device comprising:at least one objective law in respect of the pitching axis, the aim of such an objective law being to bring at least one state parameter of the helicopter to an objective which represents a preset value of a state parameter, said objective law in respect of the pitching axis automatically determining for this purpose a control command for operating the tilting of the disk of said main rotor of the helicopter; andat least two objective laws in respect of the collective axis, each of these laws automatically determining a control command for operating the collective pitch of the blades of said main rotor,which device comprises:at least two objective laws in respect of the pitching axis, which function simultaneously;first selection means for automatically selecting the objective law, whose control command is used for the collective axis; andsecond selection means for automatically selecting, as a function of the selection made by said first selection means, the objective law whose control command is used for the pitching axis. 2. The device as claimed in claim 1, wherein it comprises at least one vertical objective law and one law for maintaining the recommended power for the collective axis, and at least one forward motion objective law and one vertical objective law for the pitching axis, wherein said first selection means automatically select the vertical objective law during normal functioning of the helicopter and the law for maintaining the recommended power when the power becomes insufficient to maintain the airspeed of the helicopter at a corresponding preset value, and wherein said second selection means automatically select:the forward motion objective law, when the first selection means select the vertical objective law; andthe vertical objective law when said first selection means select the law for maintaining the recommended power. 3. The device as claimed in claim 2, wherein it moreover comprises a law for maintaining the optimal upward speed for the pitching axis, and wherein said second selection means automatically select said law for maintaining the optimal upward speed when the power available is insufficient to maintain the airspeed above an optimal upward speed. 4. The device as claimed in claim 2, wherein it moreover comprises latching means for automatically latching the collective axis to a law for maintaining the recommended power, when it is selected. 5. The device as claimed in claim 4, wherein it moreover comprises means for automatically unlatching said latching means, as a function of at least one action of a pilot of the helicopter or of control commands which are determined for the pitching axis. 6. The device as claimed in claim 1, wherein it comprises at least one vertical objective law and one stabilization law for the collective axis, at least one forward motion objective law and one vertical objective law for the pitching axis, and means for detecting stabilization of the case of flight of the helicopter, and wherein said first selection means automatically select in respect of the collective axis the vertical objective law, during normal functioning of the helicopter, and when said detection means detect stabilization of the case of flight, said stabilization law which determines a control command for maintaining the collective pitch of the blades of the main rotor at a mean value, and wherein said second selection means automatically select:the forward motion objective law, when the first selection means select the vertical objective law; andthe vertical objective law, when said first selection means select the stabilization law. 7. The device as claimed in claim 6, wherein said stabilization law comprises means for correcting the control command of the collective pitch, with a r esponse time which is greater than a predetermined time, so as to maintain an airspeed objective. 8. The device as claimed in claim 6, wherein it moreover comprises means for automatically returning as the case may be to the selection representative of normal functioning, as a function of at least one action of a pilot of the helicopter or of measured values. 9. A system for the automatic control of a helicopter, said system comprising:a set of sensors for automatically determining the effective values of state parameters of the helicopter;means of adjustment allowing an operator of the helicopter to choose preset values of state parameters;a set of actuators which act on control axes of the helicopter, according to control commands; andan automatic control device which automatically determines control commands for said actuators, as a function of the state parameters and of the preset values, received respectively from said sensors and from said means of adjustment,wherein said automatic control device ( 6 ) is of the type specified under claim 1.